(APPENDIX III) SYNCHRONIZATION| PAGE 47
12. APPENDIX III: SYNCHRONIZATION
The synchronization process prevents power interruptions during transitions from
network to genset and genset to network. To this end, the genset signal equalizes
the electrical signals of the genset and network in phase, frequency and
amplitude to the network signal, enabling simultaneous activation of network and
genset contactors. During the switching power operation, there is no moment
during which both contactors (network and genset) are open at the same time,
hence preventing a installation power failure. In order to enable the
synchronization function in the CEC7 module, the presence of the Second Zero
expansion is required and the enabling of functionality in the control unit
(Synchronization table, parameter 1 value 1 and 2).
12.1 PROCEDURE
The synchronization process is performed both during start-up of the genset as
well as the return of the network provided that the CEC7 control unit is in AUTO
or TEST mode.During the synchronization process the CEC7 control unit acts
using the Second Zero expansion controlling:
• The alternator regulator plate in order to equalize the voltage of the
genset electrical signal with the voltage of the network electrical
signal. The CEC7 control unit commands the voltage regulation input
of the generator set alternator until a voltage difference between
the network and genset signals is achieved which is lower than a
programmable threshold (Synchronization table, parameter 2) for a
longer programmable time (Synchronization table, parameter 4).
• The speed signal of the engine regulation plate in order to equalize
the phase and frequency of the genset signal with the network voltage
signal. The CEC7 control unit commands the engine speed control
input of the generator set until a phase and frequency difference
between the network and genset signals is achieved which is lower
than a programmable threshold (Synchronization table, parameter 3)
for a programmable number of network cycles (Synchronization table,
parameter 5).
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