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CENTRIC 3x480, User Guide, rel. 1.7
31
Figure 20: Measurement point for calibration and adjustment of voltages and currents
7.2.2.4
MODULES OUTPUT CURRENT CALIBRATION
Use this function if it becomes necessary to recalibrate the current (ampere) readings of one of the UPS's
output phases. (Note: a password may be required to complete this function.)
Output current calibration must be performed on each module, one module at a time, with all of the other
modules turned off. (To turn modules OFF, see section
7.3.1.3 "Operation > Switch on/off > MODULES
OFF".) Start from the bottom-most module and work your way up.
Note:
•
Modules output current calibration should be performed only if necessary, not casually.
•
Modules output current calibration should be performed only under conditions where the input and
output current are stable and not subject to fluctuation.
•
Calibration is best performed when the system is under relatively high load (70+ %).
To perform the calibration:
1. Switch off all modules except for the bottom-most module.
2. Measure the current of the output phase with an ammeter, then enter the measured value into this
screen and press "confirm". When you press "confirm", only the values that you have modified
(indicated by a change in colour of the numbers from white to orange) are sent to the module.
For your reference, the present UPS-measured values are displayed on the right side of the
screen.
3. Switch OFF the module just calibrated and switch ON the module above it.
4. Perform steps 2 and 3 until all modules have been calibrated.
5. Switch ON all modules.
