General

FKV-24F phase failure relays are designed to avoid any failure of three phase motors caused from network.

Usage and Working Principle

Make the connections according to the diagram. When power is on and device check the phase voltage values are in the between the maximum and minimum set values, phase balance and phase sequences. This control takes 3-4 seconds. If voltages of phases, phase balance andphase sequences are correct , relay pulls and relay led is switched on. When relay pulls , contact 2 and 3 output are short circuit. If any phase voltage is bigger than maximuage set value U> led is switched on. If phase voltage value does not turn back normal value in 2 seconds , relay releases and relay led is switched off . When relay releases, contact 1 and 2 outputs are short circuit. When all of phase voltage values are lower than the maximum set value, U> led is switched off. If phase voltage value does not exceed the maximum set value with 5V hysteresis in 3 seconds

Maintenance

Switch off the device and release from connections. Clean the trunk of device with a swab. Don’t use any conductor or chemical
might damage the device. Make sure device works after cleaning relay pulls and relay led is switched on. When relay pulls, contact 2 and 3 outputs are short circuit. If any phase voltage is lower than minimum voltage set value U < led is switched on. If phase voltage value does not turn back normal value in 2 second, relay releases and relay led is switched off. When relay releases, contact 1 and 2 outputs are short circuit. When all of phase voltage values are bigger than the minimum set value , U< led is switched off. If phase voltage value does not exceed the minimum set value with 5V hysteresis in 3 seconds, relay pulls and relay led is switched on. When relay pulls, contact 2 and 3 outputs are short circuit.
Asymmetry ratio is ratio of maximum phase voltage to difference between the maximum phase voltage and minimum bigger than asymmetry setatio, Asym led is switched on. If asymmetry ratio value does not turn back normal value in 2 seconds, relay releases and relay led is switched off. When relay releases , contact 1 and 2 outputs are short circuit. If Asymmetry ratio does not exceed the asymmetry set ratio with %2 hysteresis in 3 seconds, relay pulls and relay led is switched on . When relay pulls contact 2 and 3 outputs are short circuit.

Example:
Asymmetry ratio = [(Lmax-Lmin) / Lmax ] x 100

Phase Voltages: L12=430V, L23=370V ve L31=390V. Lmax=430V ve Lmin=370V

Asymmetry ratio = [(430V-370V) / 430V] x100 =[60/430]x100=0.14 x 100 =14.

If phase sequence is reverse , relay releases and relay led is switched off and phase sequence (x) led is switched on . When relay releases,contact 1 and 2 outputs are short circuit. When phase sequence is right, phase sequence (x) led is switched off and after 5 seconds relay pulls and relay led is switched on. When relay pulls, contact 2 and 3 outputs are short circuit.

Warnings

Please use the device according to the manual.
Don’t use the device in wet.
Include a switch and circuit breaker in the assembly.
Put the switch and circuit breaker nearby the device, operator can reach easily.
Mark the switch and circuit breaker as releasing connection for device.

Specifications

Operating Voltage(Un)....: 3 x 380V AC
Operating Frequency.......: 50/60 Hz.
Operating Power...............: <4VA
Operating Temperature..: -20°C.....+55°C
Asymmetry...........: ±%11
Display..................: Out led and U>,U<,
Asymmetry, Phase Sequency error leds.
Connection Type..............: Terminal connection
Contact....................:5A/250V AC (Resistive Load)
Cable Diameter.................: 1,5mm²
Weight................................: Max. 110gr.
Mounting....................: Assembled on the din rail
Operating Altitude..........: <2000meter

Dimensions

Connection diagram