Restart Bypass
Delay:
When line voltages return to normal, the relay contacts in
the PLM line monitor close. After the operator presses the start switch,
the motor contactor is energized, latching supply power to itself and the
TRU time delay. The TRU is programmed in INTERVAL mode; its
contacts are closed during timing. If undervoltage or a large unbalance occurs during start up causes
the PLM’s contacts to open, the TRU’s contacts will hold in the motor
contactor for the bypass time delay. At the end of the bypass delay, the
TRU’s contacts open, returning control to the PLM line monitor. |
