UPS/NTA GB/DELMP_EXPC1C3C6_B 26
3.7.7 Uncoupling of a unit
CAUTION
Unit uncoupling can only be achieved if the system is redundant,
meaning that it can supply all the energy required to the load with
one unit disconnected.
The uncoupling of a unit is to be made from its control panel by selecting:
- the menu "UPS UNIT"
- the menu "UNIT COMMANDS"
- and the submenu "UNIT UNCOUPLING".
At this point, the UPS unit is uncoupled but still operating. Open switch Q3 in the
appropriate unit to isolate it from the system.
Note: At this point, the UPS unit can be autonomously operated.
3.7.8 Shutdown of a unit
(The unit has been previously uncoupled - See section
3.7.7)
Shutdown the unit in the following chronology order:
- select the menu "SUBSET COMMAND"
- select the submenu "INVERTER OFF",
- select the submenu "RECTIFIER OFF"
At this point:
- open battery protection Q20,
- open switch Q4
- open switch Q1 (if provided).
CAUTION
Do not forget that even when the load is stopped the unit is live:
- because of the mains voltage to the rectifier and the bypass.
- because of the residual voltage of the capacitors.
- because of the load voltage coming from the common busbar
(downstream of Q3).
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