STEP-PS/1AC/24DC/0.75/FL
Primary-switched power supply for building
automation
INTERFACE
Data sheet
103898_en_00
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© PHOENIX CONTACT - 08/2009
Description
STEP POWER power supply units – for building
automation
The new STEP POWER generation of compact power supply
units is particularly suitable for installation distributors and flat
control panels thanks to its design. The power supply units
are available with 24 V DC output voltage in four performance
classes and widths and with the special voltages 5, 12, 15
and 48 V DC. Their high degree of efficiency and the low
standby losses make for high power efficiency.
Features
–
–
–
–
–
–
–
–
Easy assembly on the DIN rail or panel
Maximum energy efficiency thanks to low idling losses
Quick startup with LED function monitoring
High operating safety due to long mains buffering under
full load and high MTBF (> 500,000 h)
Can be used worldwide in all industrial sectors due to a
wide-range input and an international approval package
Wide temperature range of -25°C to +70°C
Parallel connection possible for increased performance
and redundancy
Extra flat type for mounting on DIN rails or horizontal
DANGER OF EXPLOSION!
Only remove equipment when it is disconnected and not in the potentially explosive area.
DANGER
The device contains dangerous live elements and high levels of stored energy.
Never carry out work when the power is turned on.
Make sure you always use the latest documentation.
It can be downloaded at www.phoenixcontact.net/download
STEP-PS/1AC/24DC/0.75/FL
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Table of contents
Description ..................................................................................................................................1
Features.....................................................................................................................................................................1
2
Table of contents.........................................................................................................................2
3
Ordering data ..............................................................................................................................3
4
Technical data.............................................................................................................................3
5
Structure......................................................................................................................................6
6
Block diagram .............................................................................................................................7
7
Safety notes ................................................................................................................................7
8
Installation ...................................................................................................................................8
9
Installation position......................................................................................................................8
10 Mounting on DIN rails ..................................................................................................................9
Assembly ...................................................................................................................................................................9
Removing...................................................................................................................................................................9
11 Connection to various systems....................................................................................................9
12 Input .......................................................................................................................................... 10
Protection of the primary side...................................................................................................................................10
Recommended backup fuse for mains protection ....................................................................................................10
13 Output ....................................................................................................................................... 10
Protection of the secondary side ..............................................................................................................................10
14 Signaling ................................................................................................................................... 11
15 Function .................................................................................................................................... 11
Output characteristic curve ......................................................................................................................................11
Thermal behavior .....................................................................................................................................................12
Parallel operation .....................................................................................................................................................12
Redundant operation ...............................................................................................................................................12
Increased performance ............................................................................................................................................13
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STEP-PS/1AC/24DC/0.75/FL
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Ordering data
Description
Type
Order No.
Pcs. / Pkt.
DIN rail power supply unit 24 V DC/0.75 A, primary switched-mode, 1phase, 43 mm constructional depth.
STEP-PS/1AC/24DC/0.75/FL
2868622
1
4
Technical data
Input data
Input nominal voltage range
100 V AC ... 240 V AC
AC input voltage range
85 V AC ... 264 V AC
DC input voltage range
95 V DC ... 250 V DC
AC frequency range
45 Hz ... 65 Hz
DC frequency range
0 Hz
Current consumption
Approx. 0.37 A (120 V AC)
Approx. 0.25 A (230 V AC)
Inrush current limitation
< 15 A (typical)
I2 t
< 0.1 A2s
Power failure bypass
> 15 ms (120 V AC)
> 70 ms (230 V AC)
Typical response time
< 0.5 s
Protective circuitry
Transient surge protection Varistor
Input fuse, integrated
1.25 A (slow-blow, internal)
Recommended backup fuse for mains protection
6 A (Characteristic B)
10 A (characteristic B)
16 A (characteristic B)
Output data
Nominal output voltage
24 V DC ±1%
Output current
0.75 A (-25°C ... 70°C)
0.83 A (-25 °C ... 40 °C permanent)
1.4 A (maximum output current)
Derating
Above +55°C: 2.5% per Kelvin
Control deviation
< 1 % (change in load, static 10% ... 90%)
< 2 % (change in load, dynamic 10% ... 90%)
< 0.1 % (change in input voltage ±10%)
Efficiency
> 84 % (for 230 V AC and nominal values)
Ascent time
< 0.5 s (UOUT (10% ... 90%))
Residual ripple
< 75 mVPP (with nominal values)
Peak switching voltages
< 75 mVPP (with nominal values)
Connection in parallel
Yes, for redundancy and increased capacity
Connection in series
Yes
Surge protection against internal surge voltages
Yes, limited to approx. 35 V DC
Resistance to reverse feed
max. 35 V DC
LED status indicator
Status display
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"DC OK" LED green / UOUT > 21.5 V: LED lights up
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STEP-PS/1AC/24DC/0.75/FL
General data
Insulation voltage input/output
4 kV AC (type test)
2 kV AC (routine test)
Insulation voltage input / PE
3.5 kV AC (type test)
2 kV AC (routine test)
Insulation voltage output / PE
500 V DC (routine test)
Degree of protection
IP20
Class of protection
II
MTBF
> 500 000 h in acc. with IEC 61709 (SN 29500)
Housing material
polycarbonate
Foot latch material
Plastic POM
Dimensions W / H / D (state of delivery)
36 mm / 90 mm / 43 mm
Weight
0.1 kg
Ambient conditions
Ambient temperature (operation)
-25 °C ... 70 °C (> 55° C derating)
Ambient temperature (storage/transport)
-40 °C ... 85 °C
Max. permissible relative humidity (operation)
95 % (at 25 °C, no condensation)
Vibration (operation)
< 15 Hz, amplitude ±2.5 mm in acc. with IEC 60068-2-6
15 Hz ... 150 Hz, 2.3g, 90 min.
Shock
30g in all directions in acc. with IEC 60068-2-27
Pollution degree in acc. with EN 50178
2
Climatic class
3K3 (in acc. with EN 60721)
Standards
Electrical Equipment for Machinery
EN 60204
Safety transformers for power supply units
IEC 61558-2-17
Electrical safety (of information technology equipment)
IEC 60950/VDE 0805 (SELV)
Electronic equipment for use in electrical power installations
EN 50178/VDE 0160 (PELV)
SELV
IEC 60950 (SELV) and EN 60204 (PELV)
Safe isolation
DIN VDE 0100-410
DIN VDE 0106-1010
Protection against electric shock
DIN 57100-410
Protection against electric shock, basic requirements for safe isolation in
electrical equipment
DIN VDE 0106-101
Limitation of mains harmonic currents
EN 61000-3-2
Certificate
CB Scheme
Approvals
UL approvals
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UL/C-UL listed UL 508
UL/C-UL Recognized UL 60950
NEC Class 2 as per UL 1310
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STEP-PS/1AC/24DC/0.75/FL
Conformance with EMC guideline 2004/108/EC and for low-voltage guideline 2006/95/EC
Noise immunity according to EN 61000-6-2
Electrostatic discharge
Electromagnetic HF field
Fast transients (burst)
Surge current loads (surge)
Conducted interference
Voltage dips
EN 61000-4-2
Housing
Level 3
Contact discharge
± 6 kV (Contact discharge)
Discharge in air
± 8 kV (Air discharge)
Comments
Criterion B
EN 61000-4-3
Housing
Level 4
Frequency range
80 MHz ... 3000 MHz
Field intensity
10 V/m
Comments
Criterion A
EN 61000-4-4
Input
4 kV (level 4 - asymmetrical)
Output
2 kV (Level 3 - asymmetrical)
Comments
Criterion B
EN 61000-4-5
Input
4 kV (asymmetrical: Conductor to ground)
2 kV (symmetrical: Conductor to conductor)
Output
2 kV (level 3 - asymmetrical: conductor to ground)
1 kV (Level 3 - symmetrical: Conductor to conductor)
Comments
Criterion B
EN 61000-4-6
Input/output
Level 3 - asymmetrical
Frequency range
10 kHz ... 80 MHz
Voltage
10 V
Comments
Criterion A
EN 61000-4-11
Input
(mains buffering > 20 ms)
Comments
Criterion A
Emitted interference in acc. with EN 61000-6-3
Radio interference voltage in acc. with EN 55011
EN 55011 (EN 55022) class B used in industry and residential area / EMC 1
Emitted radio interference in acc. with EN 55011
EN 55011 (EN 55022) class B used in industry and residential area / EMC 1
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STEP-PS/1AC/24DC/0.75/FL
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Structure
1
2
3
4
4
2
AC input
DC output
"DC OK" LED
Universal snap-on foot for EN DIN rails and for wall
mounting
Ou
tpu
tD
C
DC
OK
3
In
pu
tA
C
1
Input
Output
[mm2]
solid
stranded
0.2 - 2.5 0.2 - 2.5
0.2 - 2.5 0.2 - 2.5
AWG
24 - 12
24 - 12
[Nm]
Torque
0.6 - 0.8
0.6 - 0.8
Input data
Input nominal voltage range
100 V AC ... 240 V AC
AC input voltage range
85 V AC ... 264 V AC
DC input voltage range
95 V DC ... 250 V DC
AC frequency range
45 Hz ... 65 Hz
DC frequency range
0 Hz
Input fuse, integrated
1.25 A (slow-blow, internal)
Recommended backup fuse for mains protection
6 A (Characteristic B)
10 A (characteristic B)
16 A (characteristic B)
Type of connection
Screw connection
Stripping length
6.5 mm
Output data
Nominal output voltage
24 V DC ±1%
Output current
0.75 A (-25°C ... 70°C)
0.83 A (-25 °C ... 40 °C permanent)
1.4 A (maximum output current)
Type of connection
Screw connection
Stripping length
6.5 mm
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STEP-PS/1AC/24DC/0.75/FL
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Block diagram
+
+
–
–
L (+)
N (-)
7
Safety notes
DANGER OF EXPLOSION!
Only remove equipment when it is disconnected and not in the potentially explosive area.
DANGER
The device contains dangerous live elements and high levels of stored energy.
Never carry out work when the power is turned on.
WARNING
Before startup please ensure:
The mains connection has been carried out by a competent person and protection against electric shock is
guaranteed!
The device can be disconnected outside the power supply unit in accordance with the regulations as in EN
60950 (e.g. through primary side line protection)!
All feed lines are sufficiently protected and dimensioned!
All output lines are dimensioned according to the maximum output current of the device or separately
protected!
Sufficient convection is guaranteed!
CAUTION
The power supply units are built-in devices. The device may only be installed and put into operation by qualified
personnel. The corresponding national regulations must be observed.
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STEP-PS/1AC/24DC/0.75/FL
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Installation
ATTENTION
In order to ensure sufficient convection, we
recommend a minimum vertical distance of 30
mm to the other devices.
Ou
tpu
tD
C
DC
In
pu
9
tA
The power supply unit can be snapped onto all
DIN rails as per EN 60715; it can also be
mounted on walls. The device must be
mounted vertically (connecting terminals
above or below).
OK
C
Installation position
36
43
30
37
Output DC
90
150
DC OK
30
Input AC
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STEP-PS/1AC/24DC/0.75/FL
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Mounting on DIN rails
Assembly
To mount on an EN DIN rail, snap the device straight onto the
DIN rail.
If the power supply unit is to be fastened directly onto an even
surface, press the orange base latch upward and down.
Place a washer between the pulled-out base latch and the
even surface (max. outer diameter 8.5 mm, max. thickness
1.3 mm, e.g., spring washer for M4 in acc. with DIN 127-B or
toothed lock washer in acc. with DIN 6797).
Then fasten the device with two screws (max. thread
diameter 4 mm, max. head diameter 8.5 mm).
Removing
To dismantle from the EN DIN rail, press the orange base
latch outward and pull the device off of the DIN rail.
In the case of wall mounting, loosen the screws and press the
base latch inwards again.
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Connection to various systems
TN-S
TN-C
TT
L
N
PE
L
N
+
-
iT
L
PEN
L
N
+
-
L1
L2
L3
L
N
L
N
+
-
L
N
+
-
The 100 V AC ... 240 V AC connection is made using the L and N screw connections.
The device can be connected to 1-phase AC networks or to two of the phase conductors of three-phase systems (TN, TT or
IT networks in acc. with VDE 0100-300/IEC 60364-3) with nominal voltages of 100 V AC ...240 V AC.
For operation on two of the phase conductors of a three-phase system, an isolating facility for all poles must
be provided.
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STEP-PS/1AC/24DC/0.75/FL
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Input
CAUTION
If an internal fuse is triggered, there is most
probably a malfunction in the device. In this
case, the device must be inspected in the
factory!
Ou
tpu
tD
C
Protection of the primary side
DC
In
pu
tA
The device must be installed in acc. with the regulations as in
EN 60950. It must be possible to disconnect the device using
a suitable isolating facility outside the power supply.
The primary side line protection, for example, is suitable. For
device protection, there is an internal fuse. Additional device
protection is not necessary.
OK
C
Recommended backup fuse for mains protection
Power circuit-breaker 6 A, 10 A or 16 A, characteristic B (or
identical function). Connect a suitable fuse upstream for DC
applications!
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Output
CAUTION
Make sure that all output lines are dimensioned
according to the maximum output current or are
separately protected. The cables on the
secondary side must have sufficiently large
cross sections in order to keep the voltage
drops on the lines as low as possible.
Ou
tpu
tD
C
DC
In
pu
OK
The connection is made using the "+" and "-" screw
connections on the screw connection of the DC output. The
set output voltage is 24 V DC at the time of delivery.
Protection of the secondary side
tA
C
The device is electronically protected against short circuit and
idling. In the event of a malfunction, the output voltage is
limited to 35 V DC.
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Signaling
The "DC OK" LED enables evaluation of the function of the power supply directly on site.
State 1
State 2
ON
OFF
Cause
Output voltage > 21.5 V
Output voltage < 21,5 V or no voltage at the output
Meaning
Output voltage and output
current OK
The device is in operation, but there is a fault in the
consumer, the current consumption is greater than I1 or the
output is short circuited.
The device is out of operation because there is no mains
voltage, the fuse on the primary side has been triggered, or
the device is faulty.
"DC OK" LED
15
Function
UOUT [V]
Output characteristic curve
PN
P1
IN
I1
UN
IMAX
IOUT [A]
The power supply works with a power reserve as shown in the
U/I characteristic curve in the figure. At ambient temperatures
TAMB < +40°C, I1 is available continuously. At higher
temperatures, it's available for a few minutes. In the event of
a secondary-side short circuit or overload, the output current
is limited to IMAX. Thereby, the module does not switch off, but
rather supplies a continuous output current. The secondary
voltage is reduced here until the short circuit is eliminated.
The U/I characteristic curve with the power reserve ensures
that both high inrush currents of capacitive loads as well as
consumers with DC/DC converters in the primary circuit can
be supplied.
UN = 24 V
IN = 0.75 A
PN = 18 W
I1 = 0.83 A
P1 = 19.8 W
IMAX = 1.4 A (UOUT = 0 V)
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STEP-PS/1AC/24DC/0.75/FL
Output current [A]
Thermal behavior
With an ambient temperature of up to +55°C, the device
supplies the continuous output current of IN. In the case of
ambient temperatures above +55°C, the output current must
be reduced by 2.5% per Kelvin increase in temperature. The
device does not switch off at ambient temperatures of +70°C
or thermal overload. The output capacity is reduced as far as
necessary to provide device protection. After it has cooled
down, the output capacity is increased again.
IN
0
-25
20
40
60
Ambient temperature [°C]
Parallel operation
Devices of the same type can be connected in parallel to
enable both redundancy and an increase in efficiency. No
other alignment is necessary when in the state of delivery.
To ensure symmetrical distribution of power, we recommend
designing all cable connections from the power supply unit to
a busbar of the same length and with the same conductor
cross section. The system makes it advisable to install a
protective circuit at the output of each device when more than
two power supply units are connected in parallel (e.g.
decoupling diode or DC fuse). This prevents high reverse
feed currents in the event of a secondary device fault.
Redundant operation
IN
IN
+ −
+ −
+
−
+ −
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Σ = IN
Redundant circuits are suitable for the supply of systems
which make especially high requirements on the operational
safety. If a fault occurs in the primary circuit of the first power
supply unit, the second device automatically takes over the
entire power supply, without interruption, and vice versa. For
this reason, the power supply units to be connected in parallel
are dimensioned in such a way that the total current
requirement of all consumers can be completely covered by
one power supply unit. 100% redundancy makes external
decoupling diodes necessary (QUINT-DIODE/40, Order No.
2938963)!
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STEP-PS/1AC/24DC/0.75/FL
Increased performance
IN
IN
+ −
+ −
+
−
+ −
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For n parallel connected devices, the output current can be
increased to n x IN. Parallel connection to increase efficiency
is used for the expansion of existing systems. It is advisable
to use parallel connection if the power supply unit does not
cover the current requirement of the most powerful
consumer. Otherwise the consumers should be spread
among individual devices independent of one another. A
maximum of five devices can be connected in parallel!
Σ = 2 x IN
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany • Phone: +49-(0) 5235-3-00
PHOENIX CONTACT • P.O.Box 4100 • Harrisburg • PA 17111-0100 • USA • Phone: +717-944-1300
www.phoenixcontact.com
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