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CENTRIC 3x480, User Guide, rel. 1.7
39
7.2.3.4
DC-TO-DC VOLTAGE ADJUSTMENTS
This function enables you to adjust the voltages out of each individual dc-dc block.
Adjustments are made to each dc/dc block separately, one block at a time.
7.2.3.4.1
A
DJUSTING THE
“
BOOST
”
VOLTAGE
The fields labeled “Positive dc voltage” and “Negative dc voltage” modify the “boost” voltage, which is the
voltage between the positive dc bus and the dc midpoint, and between the negative dc bus and the dc
midpoint.
The ideal boost voltages are “plus” and “minus“ 425 Vdc.
The voltages can be adjusted up or down by up to 1.875 volts.
Modification of the boost voltage should be done when there is no load on the UPS, and no ac input – the
input circuit breakers are in the “OFF” position.
7.2.3.4.2
A
DJUSTING THE BATTERY VOLTAGE
(
THE
“
BUCK
”
VOLTAGE
)
The fields labeled “Battery positive dc” and “Battery negative dc” effect the voltage between the positive
battery bus bar and the dc midpoint, and between the negative battery bus bar and the dc midpoint.
The ideal buck voltages are “plus” and “minus“ 270 Vdc.
This function enables you to adjust the “buck” voltage up or down by a maximum of 1.875 volts.
Modification of the battery voltages should be made only when the battery is fully charged.
Figure 29: Dc/Dc voltages adjustment screen
7.2.3.5
SERIAL NUMBERS
Use this function to record the serial numbers of the Centric’s UPS modules. The serial number can be
found on a silver sticker on the exterior of each UPS module.
