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Applications
The phase unbalance feature will protect motors of any size against:
Excessive temperature rise due to unbalanced supplies ( e.g. a 10% unbalanced supply can increase the temperature rise by 150%)
The regenerated voltage generated during a single phase failure when running at low load.
Features
Principle of Operation
The protector comprises monitoring circuits for voltage phase reversal and phase unbalance. Outputs from these circuits are fed to a comparator which changes state under fault conditions.
When the comparator trips, the output relay will de-energise after a preset time delay & the red LED will then no longer be lit.
The relay and LED will automatically energise again when all the supply parameters have returned to safe and acceptable limits.
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