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UPS for 480 Vac Grid, User Guide, doc. rel.4.0
Each ac power module’s output voltage must be adjusted on its own. In order to
adjust the output phases all other modules must be have their inverter off and
the unit must be on normal mode.
This may require the system to be placed in maintenance bypass. If the
maintenance bypass breaker is connected to the UPS's manual bypass terminals,
the connector will need to be disconnected after opening the UPS output CB.
Auto Correction is enabled by default. This is the recommended setting for most
situations.
After performing any calibrations or adjustments the Auto Correction feature
should be re-enabled, for optimal system performance.
To detect and correct any inaccuracy in an ac power module output voltage:
1.
Look at each ac power modules ac output voltage in the main>status>modules screen and
locate the module with the inaccurate output voltage.
2.
Isolate the UPS from all ac and dc power and open the rear bottom cover to expose the
output and mid-point bus bars.
3.
Turn on input ac and battery circuit breakers.
4.
Turn on the system and wait for it to transfer to normal mode
5.
Select and shut down all other inverters. Main>operation>turn on/off>modules
off>inverter off.
6.
Using a calibrated volt meter measure the output line (L1, L2, L3) to midpoint voltage.
