UPS for 480 Vac Grid, User Guide, doc. rel. 4.0
66
8.2.2.7.
DC BUS VOLTAGE CALIBRATION
Use this function is used to correct any inaccuracy in the UPS’s reading of the battery voltage.
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.
The UPS’s readings are calibrated before the UPS leaves the factory, but over time or due to
environmental factors the UPS’s dc measurements may drift slightly.
Figure 44: DC Bus voltage Calibration
Keep in mind that in this screen (and in most screens related to dc voltage) the UPS displays the
battery voltage in two parts: a negative half and a positive half. For example, if the battery was
charged to the ideal level of ±435 Vdc, and the UPS’s measurement was perfectly calibrated, the
battery voltage reading would be displayed as about 435 Vdc negative and 435 Vdc positive.