QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
POWER SUPPLY
AC 100-240V Wide-range Input
Width only 82mm
Efficiency up to 93.9%
ATEX and IECEx Approved (-A1 Version)
-C1 Version with Conformal Coated PC-board
150% (720W) Peak Load Capability
Safe HiccupPLUS Overload Mode
Easy Fuse Tripping due to High Overload Current
Active Power Factor Correction (PFC)
Negligible low Inrush Current Surge
Short-term Operation down to 60Vac and up to 300Vac
Full Power Between -25°C and +60°C
DC-OK Relay Contact
Quick-connect Spring-clamp Terminals
3 Year Warranty
GENERAL DESCRIPTION
SHORT-FORM DATA
The most outstanding features of this Dimension QSeries DIN-rail power supply are the high efficiency and
the small size, which are achieved by a synchronous
rectification and further novel design details.
Output voltage
Adjustment range
Output current
With short-term peak power capability of 150% and
built-in large sized output capacitors, these features
help start motors, charge capacitors and absorb reverse
energy and often allow a unit of a lower wattage class
to be used.
High immunity to transients and power surges as well as
low electromagnetic emission makes usage in nearly
every environment possible.
The integrated output power manager, a wide range
input voltage design and virtually no input inrush
current make installation and usage simple. Diagnostics
are easy due to the dry DC-ok contact, a green DC-ok
LED and red overload LED.
Unique quick-connect spring-clamp terminals allow a
safe and fast installation and a large international
approval package for a variety of applications makes
this unit suitable for nearly every situation.
ORDER NUMBERS
Power Supply
Accessory
DC 24V
24 - 28V
20 – 17A
30 – 26A
Output power
480W
720W
Output ripple
< 100mVpp
Input voltage
AC 100-240V
Mains frequency
50-60Hz
AC Input current
4.56 / 2.48A
Power factor
0.95 / 0.90
AC Inrush current
typ. 9 / 7A peak
Efficiency
92.4 / 93.9%
Losses
39.6 / 31.4W
Temperature range -25°C to +70°C
Derating
12W/°C
Hold-up time
typ. 32 / 51ms
Dimensions
82x124x127mm
continuous
for typ. 4s
continuous
for typ. 4s
20Hz to 20MHz
±15%
±6%
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
at 120 / 230Vac
operational
+60 to +70°C
at 120 / 230Vac
WxHxD
MARKINGS
QS20.241
QS20.241-A1
QS20.241-C1
24-28V Standard unit
ATEX approved unit
Conformal coated unit
ZM2.WALL
ZM15.SIDE
YR40.242
YR40.245
Wall mount bracket
Side mount bracket
Redundancy module
Redundancy module
IND. CONT. EQ.
UL 508
IECEx
UL 60950-1
Class I Div 2
ATEX
II 3G Ex ec nC II T3 Gc
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
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EMC, LVD, RoHS
1/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
INDEX
Page
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Intended Use .......................................................3
Installation Requirements ...................................3
AC-Input...............................................................4
DC-Input...............................................................5
Input Inrush Current ...........................................5
Output .................................................................6
Hold-up Time .......................................................8
DC-OK Relay Contact ..........................................8
Efficiency and Power Losses................................9
Lifetime Expectancy and MTBF.........................10
Functional Diagram...........................................10
Terminals and Wiring ........................................11
Front Side and User Elements ...........................12
EMC ....................................................................13
Environment ......................................................14
Protection Features ...........................................15
Safety Features ..................................................15
Dielectric Strength ............................................16
Approvals ...........................................................17
Physical Dimensions and Weight ......................18
Page
21. Accessories ........................................................ 19
21.1. ZM2.WALL Wall Mounting Bracket ....... 19
21.2. ZM15.SIDE Side Mounting Bracket ........ 19
21.3. YR40 Redundancy Modules ..................... 20
22. Application Notes ............................................. 21
22.1. Repetitive Pulse Loading .......................... 21
22.2. Peak Current Capability ........................... 22
22.3. Back-feeding Loads .................................. 22
22.4. External Input Protection ......................... 22
22.5. Charging of Batteries ............................... 23
22.6. Output Circuit Breakers............................ 23
22.7. Parallel Use to Increase Output Power .... 24
22.8. Parallel Use for Redundancy .................... 24
22.9. Series Operation ....................................... 25
22.10. Inductive and Capacitive Loads................ 25
22.11. Operation on Two Phases ........................ 25
22.12. Use in a Tightly Sealed Enclosure ............ 25
22.13. Mounting Orientations ............................ 26
The information presented in this document is believed to be accurate and reliable and may change without notice.
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.
TERMINOLOGY AND ABREVIATIONS
PE and
symbol
Earth, Ground
PE is the abbreviation for Protective Earth and has the same meaning as the symbol
.
This document uses the term “earth” which is the same as the U.S. term “ground”.
T.b.d.
To be defined, value or description will follow later.
AC 230V
A figure displayed with the AC or DC before the value represents a nominal voltage with
standard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)
230Vac
A figure with the unit (Vac) at the end is a momentary figure without any additional
tolerances included.
50Hz vs. 60Hz
As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.
may
A key word indicating flexibility of choice with no implied preference.
shall
A key word indicating a mandatory requirement.
should
A key word indicating flexibility of choice with a strongly preferred implementation.
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
1. INTENDED USE
This device is designed for installation in an enclosure and is intended for the general use such as in industrial control,
office, communication, and instrumentation equipment.
Do not use this power supply in equipment, where malfunction may cause severe personal injury or threaten human
life.
This device is designed for use in hazardous, non-hazardous, ordinary or unclassified locations.
2. INSTALLATION REQUIREMENTS
This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to
the factory for inspection.
Mount the unit on a DIN-rail so that the output terminals are located on the top and the input terminals are located
on the bottom of the unit. For other mounting orientations see de-rating requirements in this document. See chapter
22.13.
This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do
not cover ventilation grid (e.g. cable conduits) by more than 30%!
Keep the following installation clearances: 40mm on top, 20mm on the bottom, 5mm on the left and right sides are
recommended when the device is loaded permanently with more than 50% of the rated power. Increase this clearance
to 15mm in case the adjacent device is a heat source (e.g. another power supply).
A disconnecting means shall be provided for the output of the power supplies when used in applications according to
CSA C22.2 No 107.1-01.
WARNING
Risk of electrical shock, fire, personal injury or death.
- Do not use the power supply without proper grounding (Protective Earth). Use the terminal on the input block for
earth connection and not one of the screws on the housing.
- Turn power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit as high voltages are present inside.
- Use caution to prevent any foreign objects from entering the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.
Notes for use in hazardous location areas:
The power supply is suitable for use in Class I Division 2 Groups A, B, C, D locations.
Additionally, the QS20.241-A1 is suitable for use in Group II Category 3 (Zone 2) environments and is evaluated
according to EN 60079-0:2009 and EN 60079-15:2010.
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment. Do not disconnect the unit or operate the
voltage adjustment unless power has been switched off or the area is known to be non-hazardous.
A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils the
requirements of the EN 60079-15.
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
3/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
3. AC-INPUT
AC input
AC input range
Allowed voltage L or N to earth
Input frequency
Turn-on voltage
Shut-down voltage
Input current
Power factor *)
Crest factor **)
Start-up delay
Rise time
Turn-on overshoot
nom.
min.
min.
min.
max.
nom.
typ.
typ.
typ.
AC 100-240V
85-276Vac
60-85Vac
276-300Vac
276Vac
50–60Hz
77Vac
73Vac
53Vac
typ.
typ.
typ.
typ.
typ.
typ.
max.
AC 100V
5.47A
0.96
1.6
640ms
80ms
85ms
100mV
suitable for TN-, TT- and IT mains networks
continuous operation
full power for 200ms, no damage between 0 and 85Vac
< 500ms
continuous, IEC 62103
±6%
steady-state value, see Fig. 3-1
steady-state value, see Fig. 3-1
dynamic value
AC 120V
4.56A
0.95
1.7
610ms
80ms
85ms
100mV
AC 230V
2.48A
0.90
2.05
660ms
80ms
85ms
100mV
at 24V, 20A, see Fig. 3-3
at 24V, 20A, see Fig. 3-4
at 24V, 20A
see Fig. 3-2
0mF, 24V, 20A, see Fig. 3-2
20mF, 24V, 20A, see Fig. 3-2
see Fig. 3-2
*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform.
Rated
input range
max.
500ms
Turn-on
full
power
for
200ms
Shut-down
POUT
Fig. 3-2 Turn-on behavior, definitions
Input
Voltage
VIN
60V
85V
Input Current, typ.
5
4
3
Rise
Time
Fig. 3-4 Power factor vs. output load
Power Factor, typ.
100Vac
120Vac
1.0
ac
0V
10
Vac
120
0.95
ac
0.85
230V
2
Start-up
delay
276V 300Vac
Fig. 3-3 Input current vs. output load at 24V
6A
- 5%
Output
Voltage
Overshoot
Fig. 3-1 Input voltage range
230Vac
0.9
0.8
1
Output Current
0
2
4
6
8 10 12 14 16 18 20A
Output Current
0.75
2
4
6
8
10 12 14 16 18 20A
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
4/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
4. DC-INPUT
DC input
DC input range
DC input current
Allowed Voltage L/N to Earth
Turn-on voltage
Shut-down voltage
nom.
min.
typ.
max.
typ.
typ.
DC 110-150V
88-187Vdc
4.6A
375Vdc
74Vdc
69Vdc
+
Power Supply
AC
L
N
PE
-
+
-
110Vdc, at 24V, 20A
IEC 62103
steady state value
steady state value
Instructions for DC use:
a) Use a battery or similar DC source.
For other sources contact PULS
b) Connect +pole to L and –pole to N.
c) Connect the PE terminal to an earth wire or to the
machine ground.
Fig. 4-1 Wiring for DC Input
Battery
-20%/+25%
Load
DC
5. INPUT INRUSH CURRENT
An active inrush limitation circuit limits the input inrush current after turn-on of the input voltage and after short
input voltage interruptions.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.
max.
AC 100V
13Apeak
AC 120V
13Apeak
AC 230V
13Apeak
typ.
11Apeak
9Apeak
7Apeak
Inrush energy
max.
5A2s
5A2s
5A2s
Inrush delay (A)
typ.
400ms
400ms
650ms
Inrush current
over entire temperature range;
mains interruptions > 750ms
over entire temperature range;
mains interruptions > 750ms
over entire temperature range;
mains interruptions > 750ms
see (A) in Fig. 5-1
Fig. 5-1 Input inrush current, typical behavior
A….
Inrush delay
Input:
Output:
Ambient:
Upper curve:
Middle curve:
Lower curve:
Time basis:
230Vac
24V, 20A
25°C
Input current 5A / DIV
Input voltage 500V / DIV
Output voltage 20V / DIV
100ms / DIV
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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5/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
6. OUTPUT
Output voltage
Adjustment range
Factory setting
Line regulation
Load regulation
Ripple and noise voltage
Output current
Output power
nom.
min.
max.
typ.
max.
max.
max.
nom.
nom.
nom.
24V
24-28V
30V ****)
24.1V
10mV
100mV
100mVpp
20A
17A
30A *)
nom.
26A *)
nom.
nom.
typ.
min.
max.
typ.
Short-circuit current
min.
max.
max.
480W
720W *)
4s
3.5s
4.5s
7s
cont. current
HiccupPLUS mode**)
30A ***)
40A ***)
14A ***)
Output capacitance
typ.
8 500µF
BonusPower® time
BonusPower® recovery time
Overload behaviour
*)
**)
***)
****)
guaranteed
at clockwise end position of potentiometer
±0.2%, at full load, cold unit
60-300Vac
static value, 0A 20A
20Hz to 20MHz, 50Ohm
continuously available at 24V, see Fig. 6-1
continuously available at 28V, see Fig. 6-1
short term available BonusPower® *),
at 24V, for typical 4s, see Fig. 6-1
short term available BonusPower® *),
at 28V, for typical 4s, see Fig. 6-1
continuously available
short term available BonusPower® *)
duration until the output voltage dips, see Fig. 6-2
overload free time to reset power manager Fig. 6-4
output voltage > 20Vdc, see Fig. 6-1
output voltage < 20Vdc, see Fig. 6-1
load impedance 50mOhm, see Fig. 6-3
load impedance 50mOhm, see Fig. 6-3
average (R.M.S.) current, load impedance 90% of the adjusted output voltage
F
Overload LED (red)
On, when the voltage on the output terminals is 2000m (6500ft), see Fig. 15-2
III
IEC 62103, EN 50178, altitudes up to 2000m
II
altitudes from 2000m to 6000m
2
IEC 62103, EN 50178, not conductive
The unit does not release any silicone or other LABS-critical substances and is suitable for
use in paint shops.
Altitude
Altitude de-rating
Over-voltage category
Degree of pollution
LABS compatibility
*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present
Fig. 15-1 Output current vs. ambient temp.
Allowed Output
Current at 24V
Fig. 15-2 Output current vs. altitude
Allowed Output
Current at 24V
30A
for typ. 4s
25
30A
20
continuous
15
20
10
5
5
Ambient Temperature
0
20
40
continuous
15
10
0
-25
for typ. 4s
25
A
A... Tamb < 60°C
B... Tamb < 50°C
C... Tamb < 40°C
0
2000
C
Altitude
0
60 70°C
B
4000
6000m
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
14/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
16. PROTECTION FEATURES
Output protection
Output over-voltage protection
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse
*)
Electronically protected against overload, no-load and short-circuits *)
typ. 32Vdc
In case of an internal power supply defect, a redundant
circuit limits the maximum output voltage. The output
max. 37Vdc
shuts down and automatically attempts to restart.
IP 20
EN/IEC 60529
> 3.5mm / > 5mm
top side / bottom side; e.g. screws, small parts
yes
Output shut-down with automatic restart
MOV (Metal Oxide Varistor)
included
not user replaceable
In case of a protection event, audible noise may occur.
17. SAFETY FEATURES
Input / output separation *)
Class of protection
Isolation resistance
PE resistance
Touch current (leakage current)
*)
SELV
IEC/EN 60950-1
PELV
IEC/EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
double or reinforced insulation
I
PE (Protective Earth) connection required
> 5MOhm
input to output, 500Vdc
< 0.1Ohm
typ. 0.23mA / 0.63mA
100Vac, 50Hz, TN-,TT-mains / IT-mains
typ. 0.34mA / 0.93mA
120Vac, 60Hz, TN-,TT-mains / IT-mains
typ. 0.58mA / 1.56mA
230Vac, 50Hz, TN-,TT-mains / IT-mains
< 0.31mA / 0.77mA
110Vac, 50Hz, TN-,TT-mains / IT-mains
< 0.45mA / 1.13mA
132Vac, 60Hz, TN-,TT-mains / IT-mains
< 0.80mA / 2.00mA
264Vac, 50Hz, TN-,TT-mains / IT-mains
double or reinforced insulation
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
18. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by
the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the
voltage with a slow ramp (2s up and 2s down). Connect all input-terminals together as well as all output poles before
conducting the test. When testing, set the cut-off current settings to the value in the table below.
Type test
60s
A
2500Vac
B
3000Vac
C
500Vac
D
500Vac
Factory test
5s
2500Vac
2500Vac
500Vac
500Vac
Field test
5s
2000Vac
2000Vac
500Vac
500Vac
> 15mA
> 15mA
> 40mA
> 1mA
Fig. 18-1 Dielectric strength
Input
DC-ok
B*)
L
N
Cut-off current setting
B
A
D
Output
Earth, PE
C
+
-
To fulfil the PELV requirements according to EN60204-1 § 6.4.1, we
recommend that either the + pole, the – pole or any other part of
the output circuit shall be connected to the protective earth
system. This helps to avoid situations in which a load starts
unexpectedly or can not be switched off when unnoticed earth
faults occur.
B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend
connecting DC-OK pins and the output pins together when performing the test.
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
16/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
19. APPROVALS
EC Declaration of Conformity
The CE mark indicates conformance with the
- EMC directive 2004/108/EC,
- Low-voltage directive (LVD) 2006/95/EC,
- RoHS directive 2011/65/EU and the
- ATEX directive 94/9/EC (only for QS20.241-A1)
CB Scheme,
Information Technology Equipment
IEC 60950-1
2nd Edition
UL 508
IND. CONT. EQ.
UL 60950-1
2nd Edition
ANSI / ISA 12.12.01-2007
(Class I Div 2)
EN 60079-15
ATEX
(QS20.241-A1 only)
Marine
SEMI F47
GOST P
II 3G Ex ec nC II T3 Gc
Listed for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865
Recognized for use as Information Technology Equipment,
Level 5; U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950-1);
E-File: E137006
Applicable for altitudes up to 2000m.
Recognized for use in Hazardous Location Class I Div 2 T3
Groups A,B,C,D systems; U.S.A. (ANSI / ISA 12.12.01-2007) and
Canada (C22.2 No. 213-M1987)
Suitable for use in Class 1 Zone 2 Groups IIa, IIb and IIc
locations. Number of ATEX certificate: EPS 09 ATEX 1 236 X
The power supply must be built-in in an IP54 enclosure.
GL (Germanischer Lloyd) classified and
ABS (American Bureau for Shipping) PDA
Environmental category: C, EMC2
Marine and offshore applications
SEMI F47-0706
Ride-through compliance for semiconductor industry.
Full SEMI range compliance
(Input: AC120V or higher, output: < 480W)
Certificate of Conformity for Russia and other GUS countries
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
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QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
20. PHYSICAL DIMENSIONS AND WEIGHT
Weight
DIN-Rail
Installation Clearances
1200g / 2.65lb
Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN-rail height must be added to the unit depth (127mm) to calculate the total required
installation depth.
See chapter 2
Fig. 20-1 Front view
Fig. 20-2 Side view
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
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QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
21. ACCESSORIES
21.1. ZM2.WALL WALL MOUNTING BRACKET
This bracket is used to mount the power
supply onto a flat surface without utilizing a DIN-Rail.
21.2. ZM15.SIDE SIDE MOUNTING BRACKET
This bracket is used to mount Dimension units sideways with or without utilizing a DIN-Rail. The two aluminum
brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can be mounted.
For sideway DIN-rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on
the steel bracket.
Side mounting with DIN-rail brackets
Side mounting without DIN-rail brackets
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
19/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
21.3. YR40 REDUNDANCY MODULES
YR40.242 – (2x 20A Inputs, 1x 40A output)
The YR40.242 is equipped with two input channels, which are individually decoupled by
utilizing mosfet technology. Using mosfets instead of diodes reduces the heat generation and
the voltage drop between input and output. The YR40.242 does not require an additional
auxiliary voltage and is self-powered even in case of a short circuit across the output.
Due to the low power losses, the unit is very slender and only requires 36mm width on the
DIN-rail.
YR40.245 – (1x 40A input, 1x 40A output)
The YR40.245 is a 40A single channel redundancy module, which is equipped with a plug
connector on the output. The plug connector allows replacing the power supply or the
redundancy module while the system is running. The plug connector avoids that the output
wires can touch and short the load circuit.
The YR40.245 is very slender and only requires 46mm width on the DIN-rail. It also utilizes
mosfet technology instead of diodes for low heat generation and a minimal voltage drop
between input and output. It does not require an additional auxiliary voltage and is selfpowered even in case of a short circuit across the output.
Fig. 21-1 Typical 1+1 Redundant configuration
for 20A with a dual redundancy module
24V
20A
Load
++
- - DC-
24V,20A OK
QS20.241
Power
Supply
L N PE
+
-
Output
YR40.242*)
Redundancy
Module
Fig. 21-2 Typical N+1 or 1+1 Redundant configuration for 20A with
multiple YR40.245 redundancy modules
Failure
Monitor
++
Failure
Monitor
++
- - DC-
24V,20A OK
QS20.241
Power
Supply
QS20.241
Power
Supply
L
N
PE
Output
++
--
YR40.245
Redundancy
Module
L N PE
L N PE
+ - + -
+
QS20.241
Power
Supply
Output
YR40.245
Redundancy
Module
Input
-
L N PE
+
-
I
I
I
-
+
DC24V,20A OK
Input
Input Input
1
2
also possible
-
+
--
DC24V,20A OK
*) YR40.241
I
24V
20A
Load
L
N
PE
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
20/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22. APPLICATION NOTES
22.1. REPETITIVE PULSE LOADING
Typically, a load current is not constant and varies over time. This power supply is designed to support loads with a
higher short-term power demand (=BonusPower®). The short-term duration is hardware controlled by an output
power manager and is available on a repeated basis. If the BonusPower® load lasts longer than the hardware
controller allows it, the output voltage will dip and the next BonusPower® is available after the BonusPower® recovery
time (see chapter 6) has elapsed.
To avoid this, the following rules must be met:
a) The power demand of the pulse must be below 150% of the nominal output power.
b) The duration of the pulse power must be shorter than the allowed BonusPower® time. (see output section)
c)
The average (R.M.S.) output current must be below the specified continuous output current.
If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use the
maximum duty cycle curve (Fig. 22-2) to check if the average output current is below the nominal current.
Fig. 22-1 Repetitive pulse loads, definitions
Fig. 22-2 Max. duty cycle curve
1.0
PPEAK TPEAK
DutyCycle
max.
150%
0.6
100%
0.4
P0
P0 = 100%
0.2
0
100
P0
PPEAK
T0
TPEAK
Example:
P0 = 10%
P0 = 50%
P0 = 75%
0.8
T0
Base load (W)
Pulse load (above 100%)
Duration between pulses (s)
Pulse duration (s)
110
DutyCycle =
T0 =
120
130
PPEAK
150%
140
Tpeak
Tpeak + T0
Tpeak - (DutyCycle x Tpeak)
DutyCycle
A load is powered continuously with 240W (= 50% of the rated output load). From time to time a peak
power of 720W (= 150% of the rated output load) is needed for 1 second.
The question is: How often can this pulse be supplied without overloading the power supply?
- Make a vertical line at PPEAK = 150% and a horizontal line where the vertical line crosses the P0 = 50%
curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)
- Calculate the required pause (base load) length T0:
- Result: The required pause length = 1.7s
T0=
- Max. repetition rate = pulse +pause length = 2.7s
Tpeak - (DutyCycle x Tpeak)
DutyCycle
=
1s - (0.37 x 1s)
0.37
= 1.7s
More examples for pulse load compatibility:
PPEAK
720W
720W
600W
P0
480W
0W
240W
TPEAK
1s
1s
1s
T0
>25s
>1.3s
> 0.75s
PPEAK
720W
720W
720W
P0
240W
240W
240W
TPEAK
0.1s
1s
3s
T0
>0.16s
>1.6s
>4.9s
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
21/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22.2. PEAK CURRENT CAPABILITY
Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current
demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost). The same situation applies when starting a capacitive load.
Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,
the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.
Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the
power supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
Fig. 22-3 Peak load with 2x the nominal
current for 50ms, typ.
Fig. 22-4 Peak load with 5x the nominal
current for 5ms, typ.
Peak load 40A (resistive) for 50ms
Output voltage dips from 24V to 20V.
Peak load 100A (resistive) for 5ms
Output voltage dips from 24V to 16V.
Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.
22.3. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.
The maximum allowed feed-back-voltage is 34Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6.
22.4. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 20A. An external protection is only required if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 10A B- or C-Characteristic breaker should be used
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
22/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22.5. CHARGING OF BATTERIES
The power supply can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)
Instructions for charging batteries:
a)
Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage
27.8V
27.5V
27.15V
26.8V
Battery temperature
10°C
20°C
30°C
40°C
b)
Use a 30A or 32A circuit breaker (or blocking diode) between the power supply and the battery.
c)
Ensure that the output current of the power supply is below the allowed charging current of the battery.
d)
Use only matched batteries when putting 12V types in series.
e)
The return current to the power supply (battery discharge current) is typ. 9mA when the power supply is switched
off (except in case a blocking diode is utilized).
22.6. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems and
may also be used on 24V branches.
MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 24V branches which are supplied by the same source, a
fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to
the ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross
section and wire length.
Fig. 22-5 Test circuit
Power Supply
AC
MCB
+
+
Wire length
DC S1... Fault simulation switch
*)
Load
S1
-
Maximal wire length*) for a fast (magnetic) tripping:
0.75mm²
1.0mm²
1.5mm²
2.5mm²
26m
35m
62m
82m
C-2A
23m
29m
54m
72m
C-3A
15m
19m
31m
51m
C-4A
7m
10m
15m
26m
C-6A
5m
7m
10m
16m
C-8A
2m
3m
5m
7m
C-10A
1m
2m
C-13A
19m
27m
38m
57m
B-6A
7m
11m
14m
23m
B-10A
1m
2m
3m
5m
B-13A
Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
23/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22.7. PARALLEL USE TO INCREASE OUTPUT POWER
Unit A
AC
Power supplies from the same series (Q-Series) can be paralleled to increase
the output power. The output voltage shall be adjusted to the same value
(±100mV) with the same load conditions on all units, or the units can be left
with the factory settings.
DC
+
+
Unit B
If more than three units are connected in parallel, a fuse or circuit breaker
with a rating of 30A or 32A is required on each output. Alternatively, a diode
or redundancy module can also be utilized.
Load
AC
-
+
-
Keep an installation clearance of 15mm (left / right) between two power
DC
supplies and avoid installing the power supplies on top of each other. Do not
use power supplies in parallel in mounting orientations other than the standard mounting orientation (input terminals
on bottom and output terminals on the top of the unit) or in any other condition where a derating of the output
current is required (e.g. altitude, above 60°C, …).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
22.8. PARALLEL USE FOR REDUNDANCY
Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a
certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is
automatically able to support the load current without any interruption.
24V
Failure
Redundant systems for a higher power demand are usually built in a
20A
Monitor
Load
N+1 method. E.g. five power supplies, each rated for 20A are paralleled
to build a 80A redundant system. For N+1 redundancy the same
restrictions apply as for increasing the output power, see also section
22.7.
Please note: This simple way to build a redundant system does not
cover failures such as an internal short circuit in the secondary side of
the power supply. In such a case, the defective unit becomes a load for
the other power supplies and the output voltage can not be maintained
any more. This can be avoided by utilizing decoupling diodes or Mosfets,
which are included in the redundancy module YR40.241 or YR40.242.
++
--
DC24V,20A OK
QS20.241
Power
Supply
L N PE
+
-
Output
YR40.242*)
Redundancy
Module
++
--
DC24V,20A OK
QS20.241
Power
Supply
Input Input
1
2
L N PE
+ - + -
Recommendations for building redundant power systems:
a)
b)
c)
Use separate input fuses for each power supply.
Monitor the individual power supply units. Therefore, use the DCOK relay contact of the QS20 power supply.
It is desirable to set the output voltages of all units to the same
value (± 100mV) or leave it at the factory setting.
I
*) YR40.241
also possible
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
I
L
N
PE
Germany
24/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22.9. SERIES OPERATION
Unit A
AC
Power supplies of the same type can be connected in series for higher
output voltages. It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed 150Vdc. Voltages
with a potential above 60Vdc are not SELV any more and can be dangerous.
Such voltages must be installed with a protection against touching.
DC
+
+
Unit B
AC
Earthing of the output is required when the sum of the output voltage is
above 60Vdc.
DC
Avoid return voltage (e.g. from a decelerating motor or battery) which is
applied to the output terminals.
Load
-
+
-
Earth
(see notes)
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other. Do not use power supplies in series in mounting orientations other than the standard
mounting orientation (input terminals on bottom and output terminals on the top of the unit).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
22.10. INDUCTIVE AND CAPACITIVE LOADS
The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.
22.11. OPERATION ON TWO PHASES
Power Supply
L1
240V +15% max.
The power supply can also be used on two-phases of a three-phase-system.
Such a phase-to-phase connection is allowed as long as the supplying
voltage is below 240V+15%. Use a fuse or a circuit breaker to protect the N
input. The N input is internally not protected and is in this case connected to
a hot wire. Appropriate fuses or circuit breakers are specified in section 22.4
“External Input Protection”.
L3
AC
L
Fuse
L2
internal
fuse
N
PE
DC
22.12. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:
Rittal Typ IP66 Box PK 9522 100, plastic, 254x180x165mm
24V, 16A; (=80%) load is placed outside the box
230Vac
49.2°C (in the middle of the right side of the power supply with a distance of 2cm)
24.4°C
24.8K
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
25/26
QS20.241, QS20.241-A1, QS20.241-C1
24V, 20A, SINGLE PHASE INPUT
Q-Series
22.13. MOUNTING ORIENTATIONS
Mounting orientations other than input terminals on the bottom and output on the top require a reduction in
continuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:
Curve A1
Curve A2
Recommended output current.
Max allowed output current (results in approximately half the lifetime expectancy of A1).
Fig. 22-6
Mounting
Orientation A
(Standard
orientation)
Output Current
OUTPUT
20A
16
12
8
4
0
10
Power
Supply
INPUT
Fig. 22-7
Mounting
Orientation B
(Upside down)
20
30
40
60°C
50
INPUT
20A
16
12
8
4
0
10
A2
A1
Ambient Temperature
20
30
40
60°C
50
Power
Supply
OUTPUT
Output Current
20A
16
12
8
4
0
10
A2
A1
Ambient Temperature
20
30
40
60°C
50
Output Current
OUTPUT
Power
Supply
INPUT
20A
16
12
8
4
0
10
A2
A1
Ambient Temperature
20
30
40
60°C
50
INPUT
Power
Supply
Output Current
OUTPUT
Fig. 22-10
Mounting
Orientation E
(Horizontal ccw)
Ambient Temperature
Output Current
Fig. 22-8
Mounting
Orientation C
(Table-top
mounting)
Fig. 22-9
Mounting
Orientation D
(Horizontal cw)
A1
20A
16
12
8
4
0
10
A2
A1
Ambient Temperature
20
30
40
50
60°C
Sep. 2019 / Rev. 2.3 DS-QS20.241-EN
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
26/26
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