Protections
31
7 MODULE DISPLAY
7.1 BACKLIGHT
The backlight will be on if the unit has sufficient voltage on the power connection while the unit is turned on.
7.2 PROTECTIONS
7.2.1 S2
The 334 ATS module monitors S2 supply to ensure that it remains within configured levels. If S2 supply fails, it is
taken off load and the start/run signal is be removed.
S2 failure
S2 has not become available after the period of the S2 Failure timer has expired.
S2 Under Voltage shutdown
The S2 supply is below the configured under voltage trip level
S2 Under Frequency shutdown
S2 supply is below the configured under frequency trip level
Failed to reach loading voltage
S2 is running and within under / over voltage trip points, but has failed to reach the configured Loading Voltage,
hence it is unfit to take load.
Failed to reach loading frequency
S2 is running and within under / over frequency trip points, but has failed to reach the configured Loading
Frequency, hence it is unfit to take load.
7.2.2 S1
S1 alarms signal that the S1 supply is out of limits. In AUTO mode, S2 is called to start (if not already running) and
will be placed on load when available.
If S1 supply fails while S2 is running in MANUAL mode, the 334 ATS module transfers load to the S2 supply.
Should an input configured to Simulate S1 Available be active, the mains failure detection is inhibited.
S1 failure
Combined message to indicate the failure of the S1 supply or activation of an input configured to Auxiliary S1
Failure.
S1 Under Frequency trip
The S1 supply is below the configured Under Frequency trip level.
S1 Under Voltage trip
The S1 supply is below the configured Under Voltage trip level.
S1 Over Frequency trip
The S1 supply is above the configured Over Frequency trip level.
S1 Over Voltage trip
S1 supply is above the configured Over Voltage trip level.
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