33
To transfer the load from the
mains supply to the generator, turn
the selector switch to Start and Run generator On
Load.
To stop the generator return the selector switch
to the Auto position. The sequence will then continue
as described in auto mode of operation.
12. DSE 530 MODEL
FULL AUTOMATIC TRANSFER
SWITCH CONTROL SYSTEM
12.2 Manual Restore Mode Of Operation
If the module is placed in
Manual Restore mode, it will
monitor the incoming mains supply. Should the
incoming mains supply fail (or fall outside of pre-set
limits), the following sequence will occur like
automatic mode until the generator close signal will
be supplied and run on load.
On return of the mains supply to within limits, the
mains return delay timer is initiated, once the timer
expires the 530 module will wait for a manual
restore to mains. This is achieved by placing the
keyswitch control into the auto position, the
sequence will then continue as described in auto
mode of operation.
12.3 Manual Operation
To initiate a start sequence
in manual, turn the selector switch to
Start and Run Generator Off Load. The start and
run generator output relay is de-energised and the
relay contacts close, givin a Remote Start signal to
the engine starting controller.
The engine stating controller should now start the
generator, the 530 module will monitor the generator
voltage and frequency and on the monitored values
are above a pre-set Loading level the generator
will become available.
12.4 INDICATIONS
The module status is indicated by front panel LEDs.
Mains Available LED:
Indicates that the incoming
AC mains supply is within limits and available o
supply the load.
Generator Available LED:
Indicates that the
generator output voltage and frequency are within
acceptable limits and available to supply the load.
Generator On Load LED:
Indicates that the
generator close signal has been supplied. Alternatively
it can be configured to give true indication of load
switching device status
Mains On Load LED:
As above but with respect
to the mains.
Auxiliary LEDs:
Use PC808 software to configure
function.
Start Delay Active LED:
Indicates that the 530
internal start delay timer is running. Once expired
the start signal will be given to the generator
controller.
Mains Return Timer Active LED:
Indicates that
the 530s internal mains return timer is running.
Once expired the load will be transferred back to
the mains supply.
AUTO
If the module is placed in
AUTO mode, it will monitor the
incoming mains supply. Should the incoming mains
supply fail, the following sequence will occur.
The module will start its Start Delay timer, this
is used to ensure that the start event is really
required and the failure is notjust a momentary dip
in the supply. Once this timer has expired the
module will continue with its normal sequence.
If the mains supply returns to within limits during
the start delay timer the unit will retun to a stand-
by state.
The start and run generator output relay is de-
energised and the relay contacts close, giving a
Remote Start signal to the engine starting
controller.
The engine starting controller (DSE 560, etc.) will
now start the generator, the 530 module monitor
the generator voltage and frequency (and an optional
generator ready input) and once the monitored
values are above a pre-set Loading level the
generator will become available. This is indicated
by the illumination of the appropriate LED on the
mimic diagram.
As soon as the generator is available the transfer
timer is initiated (3 second). Once the transfer timer
has expired, the generator close signal will be
supplied and run on load.
On return of the mains supply to within limits, the
mains return delay timer is initiated, once the timer
expires the generator close signal is removed,
removing the load. The cooling timer is then initiated,
allowing the engine a cooling down period off load
before shutting down.
Should the mains fall out of limits during the cooling
down period, the set will return on load after the
start delay timer has expired.
Figure: 7.10
DSE 530 Automatic Transfer
Switch Control Module
Control of the DSE 530 module is by a four position
rotary key-switch, mounted on the front of the
module with Auto, Auto with Manual Restore and
Manual Run On Load and Off-Load position.
12.1 Automatic Mode Of Operation
AUTO
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Summary of Contents for ALP 10-5
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