GE Industrial Solutions ISM - Manual (Page 31)

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OPM_ISM_OPT_10K_M50_0GB_V021.doc Operating Manual ISM – Intelligent Synchronization Module
7 OPERATION
WARNING !
Before connecting hazardous voltages, make sure that:
• The cables for ISM supply and communication are correctly connected and in
accordance with existing standards;
• The equipment frame has been correctly grounded to the earth;
• All panels, which had been previously removed to allow ISM connection, have been
correctly reinstalled;
• Make sure fuse holders “F1, F2, F3, F4” inside the ISM cabinet and “F5, F6, F7, F8” in
the distribution cabinet(s) are closed.
7.1 PROCEDURES FOR SCB - SYNCHRONIZATION OF CRITICAL BUSSES
Procedure for SCB - Synchronization of Critical busses start-up
As soon as one of the UPS’s, either from Group A or Group B supplies the load, the ISM system will
automatically start-up.
NOTE !
As the ISM system starts-up, an Alarm is issued and the Buzzer starts sounding if the
synchronization at the last shutdown was disabled (“SYNC OFF”).
To enable synchronization, press either the key “SYNC AUTO” for automatic choice of the
synchronization source, or “SYNC MASTER A” / “SYNC MASTER B” to choose manually one of the two.
Condition for the above is that at least one UPS of a group has it’s electronics supplied and at least one
parallel group supplies the load, and consequently the ISM.
To switch from automatic to manual synchronization, press one of the keys marked “SYNC MASTER A”
or “SYNC MASTER B”, depending on which group is desired to be the Super Master.
To change from manual synchronization to automatic, press the key “SYNC AUTO”.
To disable synchronization press key “SYNC OFF”.
NOTE !
If a parallel system with an active synchronization command is shutdown (including
electronics), the command for synchronization will be disabled and the “Alarm 4005 -
Group failure on ISM system” is issued, together with an acoustical signal from the
buzzer.
Procedure for SCB - Synchronization of Critical busses shutdown
If no UPS of either Group A or B supplies the load, the ISM system is shutdown automatically.