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34006452EN/AC - Page 31
Shutdown
Parallel UPSs with SSC (with Mains 2)
5.3 Buzzer reset
– shut down each inverter (see the "shutdown of a unit" section);
– carry out the maintenance bypass operation in the Static Switch Cubicle (the load will be directly supplied by Mains 2
via maintenance bypass switch Q3BP);
– close switch Q3BP and open switches Q5N and Q4S in the "static switch" cubicle;
– open fuse switches Q1 and Q2 in the Static Switch Cubicle;
– open battery circuit breaker QF1 in each UPS (except for frequency converters without a battery);
– open input switch Q1 for each UPS;
– the UPSs are powered down (except the Mains cables upstream from switches Q1, Q4S and Q3BP) and the load
is supplied by Mains 2.
All the lights on the control panel are off. A full powering down requires load shutdown and the opening of the upstream
protection devices on Mains 1 and 2.
– first determine the cause of the alarm;
– press the "buzzer reset" button on the hidden control panel on the concerned cubicle.
The buzzer stops, but a new alarm will set it off again.
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