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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) * LED indication for relay, alarm and power supply ON
DFB01
PFB01
Product Description
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 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.
Ordering key
Housing Function Type Item number Output Power Supply
DFB 01 C M24
Type Selection
Mounting DIN-rail Plug-in Output SPDT SPDT Measuring range 50-60 Hz 50-60 Hz Supply: 24 to 240 VAC DFB 01 C M24 PFB 01 C M24
Input 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 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
Output Specifications
Output Rated insulation voltage Contact ratings (AgSnO2) Resistive loads AC 1 DC 12 Small inductive loads AC 15 DC 13 Mechanical life Electrical life SPDT relay 250 VAC 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 = 1) 7200 operations/h
Terminals Z1, Z2 Terminals 8, 9 > 10 k < 500 > 500 ms ~ 0.05 Hz ~ 0.25 Hz
Operating frequency Dielectric strength Dielectric voltage 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s)
Specifications are subject to change without notice (12.12.05)
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DFB01, PFB01
Supply Specifications
Power supply Rated operational voltage Through terminals: DFB01: A1, A2 PFB01: 2,10 Dielectric voltage Supply to output Rated operational power Overvoltage cat. III (IEC 60664, IEC 60038) 24 to 240 VAC 15% 24 to 240 VAC 15% 4 kV 4W
General Specifications
Power ON delay Reaction time 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 DIN-rail version Plug-in version Weight Screw terminals Tightening torque Approvals CE-Marking EMC Immunity Emission 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 60C, R.H. < 95% -30 to 80C, R.H. < 95% 22.5 x 80 x 99.5 mm 36 x 80 x 94 mm Approx. 150 g Max. 0.5 Nm acc. to IEC 60947 UL, CSA Yes Electromagnetic Compatibility According to EN 61000-6-2 According to EN 61000-6-3
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.
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. 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
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Specifications are subject to change without notice (12.12.05)
DFB01, PFB01
Wiring Diagrams
DFB01 PFB01
Operation Diagrams
Normally energized relay - Latch function
Dimensions
DIN-rail
22.5 99.5
Plug-in
94
36
90
83.5
80
63
28.5
80
28.5
63
Specifications are subject to change without notice (12.12.05)
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