Monitoring Relays
Frequency Monitoring
Types DFB01, PFB01
DFB01
• Over/under frequency monitoring relays
• Measuring if power supply frequency is within set limits
• Measure on own power supply
• Measuring ranges
Voltage: 24 to 240 VAC
Frequency: 50 - 60 Hz
• Separately adjustable upper/lower level on relative
scale
• Adjustable delay on alarm or on recovery (0.1 to 30 s)
• Programmable latching or inhibit at set level
• Output: 8 A SPDT relay N.D. or N.E. selectable
• For mounting on DIN-rail in accordance with DIN/EN
50 022 (DFB01) or plug-in module (PFB01)
• 22.5 mm Euronorm housing (DFB01) or 36 mm
plug-in module (PFB01)
• LED indication for relay, alarm and power supply ON
PFB01
Product Description
Ordering key
DFB01 and PFB01 are precise frequency monitoring
relays. The relays monitor
their own power supply from
24 to 240 VAC.
The advantage of using the
latch function is that the
relay can be kept energized
Housing
Function
Type
Item number
Output
Power Supply
even after the end of the
alarm condition. Inhibit function can be used to avoid
relay operation when not
desired (maintenance, transitions). The LED's indicate
the state of the alarm and
the output relay.
DFB 01 C M24
Type Selection
Mounting
Output
Measuring range
Supply: 24 to 240 VAC
DIN-rail
Plug-in
SPDT
SPDT
50-60 Hz
50-60 Hz
DFB 01 C M24
PFB 01 C M24
Input Specifications
Output Specifications
Input
Own power supply DFB01:
PFB01:
Measuring ranges
Selectable by DIP-switches
2 Hz range
50 Hz
60 Hz
10 Hz range
50 Hz
60 Hz
Contact input
DFB02
PFB02
Disabled
Enabled
Pulse width
Hysteresis
2 Hz range
10 Hz range
Output
Rated insulation voltage
Contact ratings (AgSnO2)
Resistive loads
AC 1
DC 12
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
A1, A2 (24 to 240 VAC)
2, 10 (24 to 240 VAC)
Upper level Lower level
-0.2 to +2 Hz
49.8 to 52 Hz
59.8 to 62 Hz
-1 to +10 Hz
49 to 60 Hz
59 to 70 Hz
-2 to +0.2 Hz
48 to 50.2 Hz
58 to 60.2 Hz
-10 to +1 Hz
40 to 51 Hz
50 to 61 Hz
Terminals Z1, Z2
Terminals 8, 9
> 10 kΩ
< 500 Ω
> 500 ms
SPDT relay
250 VAC
µ
8A @ 250 VAC
5 A @ 24 VDC
2.5 A @ 250 VAC
2.5 A @ 24 VDC
≥ 30 x 106 operations
≥ 105 operations
(at 8 A, 250 V, cos ϕ = 1)
≤ 7200 operations/h
Operating frequency
Dielectric strength
Dielectric voltage
≥ 2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
~ 0.05 Hz
~ 0.25 Hz
Specifications are subject to change without notice (26.05.10)
1
DFB01, PFB01
Supply Specifications
General Specifications
Power supply
Rated operational voltage
Through terminals:
DFB01: A1, A2
PFB01: 2,10
Dielectric voltage
Supply to output
Rated operational power
Power ON delay
Reaction time
Overvoltage cat. III
(IEC 60664, IEC 60038)
24 to 240 VAC ± 15%
24 to 240 VAC ± 15%
4 kV
4W
Mode of Operation
DFB01 and PFB01 monitor
the frequency value of their
own power supply.
Example 1
(Non-latching mode - N.D.
relay)
The relay operates and the
yellow LED is ON as soon
as the measured frequency
exceeds the upper set level
or drops below the lower set
level for more than the set
delay time. The relay releases when the measured frequency comes back within
the upper and lower limits.
The red LED flashes until the
delay time has expired or
the measured value falls off
the limits.
Example 2
(Latching mode - N.E. relay)
The relay operates and the
yellow LED is ON as long as
the measured frequency is
within the upper and lower
limits.
The relay releases and
latches in alarm position as
soon as the measured frequency exceeds the upper
set level or drops below the
lower set level for more than
the set delay time. The red
LED flashes until the delay
time has expired or the
measured value comes back
within the limits. Provided
that the frequency has
dropped below the upper
set level (minus hysteresis)
or exceeded the lower set
level (plus hysteresis), the
relay operates when the
interconnections
between
terminals Z1, Z2 or 8, 9 are
interrupted.
Alarm ON delay
Alarm OFF delay
Accuracy
Temperature drift
Delay ON alarm
Repeatability
Indication for
Power supply ON
Alarm ON
Output relay ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Housing
Dimensions
DFB01
PFB01
Material
Weight
Screw terminals
Tightening torque
Product standard
Approvals
CE Marking
EMC
Immunity
Emissions
1 s ± 0.5 s
(input signal variation from
-10% to +10% or from
+10% to -10% of the range)
< 200 ms
< 200 ms
(15 min warm-up time)
± 200 ppm/°C
± 10% on set value ±50 ms
± 0.02 Hz
LED, green
LED, red (flashing 2 Hz
during delay time)
LED, yellow
IP 20
3 (DFB01), 2 (PFB01)
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
22.5 x 80 x 99.5 mm
36 x 80 x 94 mm
PA66 or Noryl
Approx. 150 g
Max. 0.5 Nm
acc. to IEC 60947
EN 60255-6
UL, CSA
L.V. Directive 2006/95/EC
EMC Directive 2004/108/EC
According to EN 60255-26
According to EN 61000-6-2
According to EN 60255-26
According to EN 61000-6-3
Function/Range/Level and Time Delay Setting
Adjust the system frequency
setting DIP switch 3 and
select the desired function
setting the DIP switches 1, 2
and 4 as shown on the right.
To access the DIP switches
open the grey plastic cover
as shown on the right.
Selection of level and time
delay:
Upper knob:
Setting of upper level:
-10 to +100% of the range.
Centre knob:
Setting of lower level:
-100 to +10% of the range.
Lower knob:
Setting of delay on alarm
time: 0.1 to 30 s.
2
Setpoint range
ON: 2 Hz
OFF: 10 Hz
Relay working mode
ON: Normally De-Energized
OFF: Normally Energized
System frequency
ON: 60 Hz
OFF: 50 Hz
Contact input
ON: Lacth function enable
OFF: Inhibit function enable
Specifications are subject to change without notice (26.05.10)
DFB01, PFB01
Operation Diagrams
Normally energized relay - Latch function
Wiring Diagrams
PFB01
DFB01
Dimensions
DIN-rail
Plug-in
94
90
63
28.5
Specifications are subject to change without notice (26.05.10)
80
36
63
99.5
83.5
80
22.5
28.5
3
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