DSE DSE331 - PROTECTIONS; S1 AND S2 SUPPLY PROTECTIONS; PLANT BATTERY WARNINGS

Protections
27
7 PROTECTIONS
7.1 S2
The 331 ATS module monitors the S2 supply to ensure that it remains within configured levels. If the 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
The 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 S1
S1 alarms signal that the mains supply is out of limits. In AUTO mode, the generator is called to start (if not
already running) and will be placed on load when available.
If the S1 supply fails while the S2 is running in MANUAL mode, the 331 ATS module transfers load to 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 mains 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
The S1 supply is above the configured Over Voltage trip level.
7.3 PLANT BATTERY
Plant battery alarms are Warning alarms only. The module displays the fault but no further action is taken.
Under Voltage warning
The battery supply is below the configured Under Voltage warning level.
Under Voltage warning
The battery supply is above the configured Over Voltage warning level.