UPS for 480 Vac Grid, User Guide, doc. rel. 4.0
68
8.2.2.8.
DC VOLTAGE ADJUSTMENT
Use this function is used to correct any inaccuracy in each module’s rectifier dc voltage.
Each power module’s dc voltage are calibrated before the UPS leaves the factory,
but over time or due to environmental factors the UPS’s dc voltage may drift
slightly.
Each ac power module’s dc voltage must be adjusted on its own. In order to
adjust the rectifier dc voltage all other modules must be completely shut down
and disconnect them from the system rack. To disconnect the other modules
from the system rack disconnect the PFC and inverter ribbon cables and slide
out at least 3 inches. The system must have at least one dc converter module and
a battery bank available.
This may require the system to be placed in maintenance bypass.
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.
