Serial Number - Gamatronic Centric 3x480 Vac User Manual

2. On the rear side of the UPS, measure the voltage between the negative ("– " dc bus and midpoint bus
bar. See Figure 22. You would expect the value to be around 435 Vdc, ± 10 V.
3. Compare your measured value to the number to the right of the screen, which is the Centric's
measurement. If your measured value differs from the Centric's measured value, enter your
measured value into the field labeled "negative dc voltage" (see Figure 25).
4. Next, measure the voltage between the positive ("+") dc bus and the "midpoint" bus bar. If your
measured value differs from the Centric's measured value, enter your measured value into the field
labeled "battery positive dc voltage".
5. Press the Confirm button to apply the corrected measurements.
6. Switch OFF the module just calibrated and switch ON the next module above it.
7. Perform steps 2 through 6 until all modules have been calibrated.
7.2.2.8

SERIAL NUMBER

This function enables you to record the serial number of each UPS power module in memory, for easy
reference.
7.2.2.9 AUTO-CORRECTION
When the average output voltage of the UPS modules is above or below what it should be, the controller
performs auto-correction, which consists of raising or lowering the output of all modules by an equal
number of volts until the average output voltage is what it should be.
Auto-correction is enabled by default; this is the recommended setting for most situations.
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CENTRIC 3x480, User Guide, rel. 1.7