DSE 333, Operation And Maintenance

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Issue 1 7
6.3 TEST ON LOAD OPERATION
Manual mode allows the operator to start and stop the set manually, and if required change the state
of the load switching devices. Manual off load mode is active when the
Test on Load button is
pressed.
6.3.1 STARTING SEQUENCE
The start request is sent to the generator via a digital output configured to Start and Run S2.
If S2 fails to become available before S2 fail delay timer expires. This is indicated on the LCD display,
but the starting signal remains active.
6.3.2 GENERATOR ON LOAD
The Generator will continue to run ON LOAD in this mode unless:

The generator supply fails
– The mains supply is placed back on load if available.

An input is given for Transfer to Mains
6.3.3 STOPPING SEQUENCE
The set will not be stopped in this mode of operation.
To begin the stopping sequence, the module should be placed in the AUTO or PROHIBIT RETURN
mode.
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 GENERATOR
The 333 ATS module monitors the generator supply to ensure that it remains within configured levels.
If the generator supply fails, it is taken off load and the start/run signal is to be removed.
Generator failure
The generator has not become available after the period of the Generator Failure timer has expired.
Generator Under Voltage shutdown
The generator supply is below the configured under voltage trip level
Generator Under Frequency shutdown
The generator supply is below the configured under frequency trip level
Failed to reach loading voltage
The generator 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
The generator 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.