This three phase (3 or 4 wire) unit monitors the supply voltages. The output relay energizes if the phases are all present, int the correct sequence and each voltage is within 5-15% range (adjustable) of each other. The relay de-energizes on:
a. A phase voltage imbalance exceeding the adj limit (5-15%).
b. Total failure of one or more phases.
c. Incorrect phase sequence.
d. Supply exceeds 15% under/over nominal voltage (Link 2-10 options).
Build -in optional facilities (SMP1 & SMP1/N only).
- 180 sec fault restart delay
- 15% fixed over/under voltage
These facilities can be utilized by connecting external links as per the diagram below.
