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0 reviews | Model: NK AGV3-SDT-24U-ENE-TR3
Jumper Select 5, 10 or 30 mA Setpoint, Normally Energized, Top Terminals
List Price: $734.00
Your Price: $653.26
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AGV Series Ground Fault Relay helps protect products and processes from damage caused by ground fault conditions by monitoring all current-carrying conductors in grounded single- and three-phase delta or wye circuits.
The AGV series has the unique ability to detect faults to earth on the load side of a variable frequency drive. The carrier or switching frequency of the drive presents a difficult challenge: The fault current will be detected at the base frequency, which determines the motor speed. While many Variable Frequency Drives have ground fault detection built-in, the detection level is the same as the overcurrent limit. That approach will shut down the drive but only after considerable damage to the motor has occurred.
The output contact action can be selected as auto-reset for applications to control a shunt trip breaker or latching for applications to de-energize a contactor coil when a fault occurs.
Broad Range of Options to Match Application Needs
Setpoint Options Maximize Ease-of-Use
Compatible with Standard Equipment
Designed for UL/cUL and CE Approval
From factory, power up initially in the reset (normal) mode. If there is a fault condition or the test button is pushed, the output contacts will change state and latch. The output will remain latched regardless of whether the fault is cleared, or control power is removed. To reset the output, apply a momentary contact across “reset” terminals. Do not apply voltage to reset terminals.
In single- and three-phase AC systems, under normal conditions current flows from the power source to the load and back to the source. As a result, the electromagnetic field surrounding the conductors cancel, producing a "zero sum current" even when the current in each phase are not equal. As soon as current leaks to ground (fault condition) the current become imbalanced and a net magnetic field results. AGV Series detectors monitor this field and trip alarm contacts when the leakage rises above the setpoint.
With the growing number of motors driven with a variable frequency drive, detecting low level ground fault current to protect the equipment being used is growing. Whether the motor is driving a submersible pump or a conveyor belt, large faults to earth are all that a drive system alone can detect. Insulation deterioration and moisture ingress produce much smaller currents to earth which are dangerous to personnel and can cause arcing in equipment. Adding an NK Technologies ground fault sensor will help keep the process as safe as possible without the spurious tripping that occurs when other ground fault detection products are used.
Sample Model Number: AGV3-SDT-120-LA-TR3 Ground fault detector with SPDT latching relay output, 120 VAC power supply and 30/50/100 mA trip point.
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