Description of Controls
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4.9.3 S2 AVAILABLE
In Auto mode, the load is automatically transferred to S2 when it is within limits (if configured as a
mains supply) or achieve loading voltage and frequency (if configured as a generator).
If a start/load request is present but S2 does not go on load, an input configured to ‘S2 Load Inhibit’
could be active.
A loading request can come from a number of sources.
• S1 supply out of limits
• Activation of an auxiliary input that has been configured to remote start on load
• Activation of the inbuilt exercise scheduler if configured for ‘on load’ runs.
NOTE: The load transfer signal remains inactive until S2 is seen as available. This
prevents loading to a supply that has failed or is not yet available.
As the load increases and decreases, the module may (depending upon configuration) remove non-
essential loads. This is configured as part of the Load Shedding control settings in the DSE
Configuration Suite Software.
See section entitled Load Shedding elsewhere in this document for further details.
If all start/load requests are removed, the stopping sequence begins.
4.9.4 STOPPING SEQUENCE
The Return Delay timer operates to ensure that the start/load request has been permanently removed
and isn’t just a short term removal. In case another start request is made during the Return Delay (or
cooling down period when S2 is configured as a generator), the set returns on load.
If there are no starting requests at the end of the Return Delay timer, the load is transferred back from
the S2 to the S1 supply and the Cooling timer is initiated (when S2 is configured as a generator).
The Cooling timer allows S2 (when configured as a generator) to run off load and cool sufficiently
before the start signal to the external generator control unit is removed. This is particularly important
where turbo chargers are fitted to the engine.
After the Cooling timer has expired, the start signal given to the external generator controller is
removed..
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