DSE Model 5520 Automatic Mains Failure Control and Instrumentation System Operators Manual
5520 OPERATING MANUAL ISSUE 1 04/02/05 AM
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13. SYNCHRONISING NOTES
Optionally, the 5520 controller can be configured to synchronise, volts match and parallel with the
mains supply. This facility can be used to supply a fixed amount of power to the load and/or mains
supply or provide no-break (closed transition) transfers to and from the generator supply.
10.5.1 CHECK SYNC
(If enabled)
The module will control the operation of the load-switching device to allow parallel operation with
the mains supply only when the two supplies are in Sync. These functions can be used to provide
manual Peak lopping/ Peak shaving and short duration no-break or bump-less transfers back to
the mains supply following a mains failure.
10.5.2 AUTO SYNC
(If enabled)
The module provides control signals to the Engine Governor and the Alternator AVR to control the
speed and voltage output from the generating set.
These functions can be used to provide peak lopping/ peak shaving (without load share control)
and true no-break or bump-less transfers back to the mains supply following a mains failure.
The 5xxx module provides the ability to control the generator by adjusting the speed (frequency)
and voltage being output. Several methods of providing this control are available. The following
pages gives a schematic overview of the interface with the engine governor and alternator AVR.
Refer to the 5xxx software manual for further details.
10.5.3 LOAD CONTROL
(If enabled)
The module features all the functions associated with the Check sync and autosync features and
in addition it provides control signals to the Engine Governor and the Alternator AVR while in
parallel with the mains (utility) supply to provide soft loading (load ramping) and control the
amount of load (kW and kVAr) supplied by the generating set.
These functions can be used to provide peak lopping/ peak shaving and true no-break or bump-
less transfers back to the mains supply following a mains failure.
Refer to the 5xxx software manual for further details.