GKR-02 voltage monitoring device is designed to protect systems from lasting both over and under voltage variations.
As an additional feature, GKR-02 switches OFF immediately (without delay) if any of the phases exceeds ±50% of Un.
GKR-02 is mainly used for protection of a 3-phase systems - such as electronic command and control systems,controllers of power compensation board, motor etc.- against voltage fluctuations. The relay is directly connected to the network and the under and over voltage limits are adjusted with the knobs located on the front panel of the devices.
When the monitored voltages of all three phases are valid and their values are within the preset limits,the output relay switches ON and all LEDs on the front panel (On = Supply voltage, R = Relay and N = Normal LEDs) turn ON. Faulty tripping operations affected from instantaneous voltage peaks are prevented with the adjustable delayed tripping between 0.1 and 10 seconds.
If any of the phase voltages falls below the Umin setting value or/and exceeds the Umax setting value; the LED (N) turns OFF and the delay time counting starts.
At the end of the preset delay time the output relay switches OFF and the LED (R) turns OFF.
● If the voltage value returns within preset limits before the delay time ends, the LED (N) turns ON without switching OFF the output relay.
● Additionally, if any of the phases falls below 0.5 x Un or/and exceeds 1.5 x Un, the preset delay time is omitted and the output relay switches OFF without delay (within less than 500 ms).
● In both cases, the relay resets itself and switches ON when the voltages return within preset values.
Rated Voltage (Un): 3 phase and neutral 230VAC; 4 wire star connection
Rated Frequency: 50/60 Hz
Operating Range: (0.9-1.1) x Un
Adjustment range: Umax: (1.05-1.30) x Un; Umin: (0.70-0.95) x Un
Delay Time: Adjustable from 0.1 sec. to 10 sec.
Instantaneous Tripping : Under 0.5 Un , Over 1.5 Un
Ins.Tripping Time:< 500 ms
Output Contact: 1 Change-Over (C/O), 5A, 1250 VA Set Point Hysteresis: 3 %
Ambient Temperature: - 5° C to + 50° C
Installation: Surface mounting or on the mounting rails Dimensions: Type PK 10
Protection Class: IP 20
Weight: 0.3 kg
An additional feature of GKR-02 is that it can be used with two-phase and single-phase systems.
See following connection diagrams for both cases: