UPS/NTA GB/DELMP_EXPC1C3C6_B 25
3.7.4 Switching to maintenance bypass - shutdown of the system
Purpose:
The Maintenance bypass is for ensuring supply to the load, while the system is stopped for
servicing, for instance.
Comply with the following procedure:
In the control panel of one of the units, select:
- menu "UPS SYSTEM",
- menu "UPS COMMANDS"
- menu "TRANSFER TO MAINTENANCE BYPASS".
The command is run through an interactive procedure. Just follow the instructions
displayed and validate with the "ENTER" key.
Display for "TRANSFER TO MAINTENANCE BYP"
UPS commands: to MAINTENANCE BYPASS
CONFIRM LOAD TRANSFER
TO MAINTENANCE BYPASS
cancel validate
ESC ENTER
NOTE: when the process is completed, all the UPS units are stopped.
CAUTION
Do not forget that even when the loads are stopped the units are live:
- because of the utility voltage to the rectifier and the bypass.
- because of the residual voltage of the capacitors.
- because of the load voltage when the maintenance bypass Q5 is closed
and the bypass supply is present.
3.7.5 System with two redundant units
In a system with two redundant units, only one maintenance bypass can be closed.
3.7.6 System with two non redundant units or more than two parallel units
In such a system, the maintenance bypass is common to the whole system.
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