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UPS for 480 Vac Grid, User Guide, doc. rel.4.0
In the dc calibration screen found in
the UPS displays the dc voltage in two parts: a
negative half and a positive half. For example, if the UPS load was perfectly stable and the UPS’s
measurement was perfectly calibrated, the dc voltage reading would be displayed as 435 Vdc
negative and 435 Vdc positive.
The UPS must be under low or no load during the dc output voltage calibration.
A password may be required to perform this function.
To calibrate the UPS’s display of the dc voltage:
1.
Turn off all dc-dc blocks except for one (Main > Operation > Turn on/off > Dc-dc on/off).
We suggest you calibrate the dc-dc blocks beginning with the bottom-most right-side block
first (see Figure 54).
Figure 54: dc-dc blocks numbering sequence
2.
The dc bus is located on the rear of the UPS (covered by the rear dc fuse access panel). Using
a calibrated voltmeter, measure the actual dc voltage between the negative (“–“) dc bus and
the midpoint bus (Figure 55).
