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UPS for 480 Vac Grid, User Guide, doc. rel.4.0
Figure 46: DC Voltage Adjustment screen
Adjustment of the dc voltage should be performed only under conditions where the
UPS's input currents and voltages are stable and not subject to fluctuation.
The readings for the positive and negative components of the module’s dc voltage
are calibrated separately (but on the same screen) and can be increased or
decreased separately.
To correct inaccuracy in UPS dc bus voltage:
1.
Isolate and turn off all ac and dc power to the UPS.
2.
Remove the back fuse cover.
3.
Turn on the ac input and battery circuit breakers.
4.
Turn off all but one module you are going to adjust (Main > Operation > Turn on/off>
Modules off> complete shutdown).
We recommend adjusting modules starting with the bottom-most module and work your way
up.
5.
Slide out all other modules which you are not adjusting and disconnect them from the system
rack.
