Monitoring Relays
Frequency Monitoring
Types DFB01, PFB01
• 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)
DFB01
PFB01
• LED indication for relay, alarm and power supply ON
Product Description
Ordering key
DFB 01 C M24
DFB01 and PFB01 are pre- even after the end of the Housing
cise frequency monitoring alarm condition. Inhibit func- Function
relays. The relays monitor tion can be used to avoid Type
their own power supply from relay operation when not Item number
24 to 240 VAC.
desired (maintenance, tran- Output
The advantage of using the sitions). The LED's indicate Power Supply
latch function is that the the state of the alarm and
relay can be kept energized the output relay.
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
Output
Rated insulation voltage
Contact ratings (AgSnO2)
Resistive loads
SPDT relay
Own power supply DFB01:
PFB01:
A1, A2 (24 to 240 VAC)
2, 10 (24 to 240 VAC)
250 VAC
µ
Measuring ranges
Selectable by DIP-switches
2 Hz range
Upper level Lower level
AC 1
DC 12
8A @ 250 VAC
5 A @ 24 VDC
2.5 A @ 250 VAC
2.5 A @ 24 VDC
-0.2 to +2 Hz -2 to +0.2 Hz
50 Hz 49.8 to 52 Hz 48 to 50.2 Hz
60 Hz 59.8 to 62 Hz 58 to 60.2 Hz
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
≥ 30 x 106 operations
10 Hz range
-1 to +10 Hz -10 to +1 Hz
49 to 60 Hz 40 to 51 Hz
59 to 70 Hz 50 to 61 Hz
≥ 105 operations
50 Hz
60 Hz
(at 8 A, 250 V, cos ϕ = 1)
Operating frequency
Dielectric strength
Dielectric voltage
≤ 7200 operations/h
Contact input
DFB02
PFB02
Disabled
Enabled
Pulse width
Terminals Z1, Z2
Terminals 8, 9
> 10 kΩ
< 500 Ω
> 500 ms
≥ 2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Hysteresis
2 Hz range
10 Hz range
~ 0.05 Hz
~ 0.25 Hz
Specifications are subject to change without notice (12.12.05)
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