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UPS for 480 Vac Grid, User Guide, doc. rel.4.0
To perform power module dc voltage calibration:
1.
Confirm that the UPS is operating in normal mode.
2.
Verify all dc converter modules are all operational (you can check either through the Status
screen or by checking that all dc converter module LED lights are green).
Figure 40: Status > Modules, PFC Status tab, DC Relay is ON
3.
Go to Status > Modules select the PFC status tab, then select a power module and verify
that the DC relay option is ON for the power module. Repeat this step for all of the power
modules in system.
To detect and correct any inaccuracy in the UPS’s display of the dc voltage:
4.
Open the rear fuse cover to expose the positive, negative, and mid-point bus bars.
5.
Navigate to Setup > Modules > DC voltage calibration.
6.
The dc Voltage Calibration screen appears.
7.
Measure the voltage between the negative (“–“) dc bus and midpoint bus bar. See Figure 45.
You would expect the value to be around 435Vdc, ± 10 V.
8.
Compare your measured value to the number on the right of Figure 41: Dc voltage calibration,
which is the UPS’s measurement. If your measured value differs from the UPS’s measured
value, enter your measured value into the field labeled Negative dc voltage.
9.
Next, measure the voltage between the positive (“+“) dc bus bar and the midpoint dc bus bar.
If your measured value differs from the UPS’s measured value, enter your measured value into
the field labeled Positive dc voltage.
You would expect the value to be 435Vdc, ± 10 V.
