Sunday, July 25, 2010

PLC Power Interruption of CPM1A PLC





Supply Voltage Drop
When the supply voltage falls below 85% of the rated value, the PLC stops and the output goes OFF.

Momentary Power Failure Detection
A momentary power failure lasting less than 10 ms with an AC power supply and 2 ms with a DC power supply is not detected and the CPU continues to operate. A momentary power failure lasting longer than 10 ms with an AC power supply and 2 ms with a DC power supply may or may not be detected in an uncertain area.

When momentary power failure is detected, the CPU stops operating and the output go OFF.

Automatic Restart
When the supply voltage recovers to a value higher than 85% of the rated value, operation resumes automatically.

The PLC may repeat stop/start operations if the supply voltage of less than 85% of the rated value gradually goes up or down. If this affects the equipment, etc, provide a protection circuit which shut off the output if the supply voltage is not above the rated value.

Time Up to Start of Operation
The time from when the power supply is turned on to when the operation starts varies depending on the operation conditions such as power supply voltage, configuration, ambient temperature etc. the minimum time is approximately 300 ms.



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