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CENTRIC 3x480, User Guide, rel. 1.7
101
10.1
Troubleshooting “Dc high”
This procedure is to be performed only as directed by Table 13 above.
If the internal dc voltage of the module is too high, the battery can be damaged.
1.
Activate the battery test (“Operation > Battery test”). During the test, the dc voltage is lowered.
2.
Use a calibrated voltmeter to measure the dc voltage between both battery connection terminals and
the “midpoint” battery terminal (i.e., between “+” and midpoint, and between “–“ and midpoint. If the
voltage as measured by the voltmeter differs from the value measured by the UPS itself, the modules’
dc meters need to be recalibrated.
3.
Verify that the dc fuses in each module are normal (not blown open).
Any module with dc voltage lower than the other moudules, has a faulty
dc fuse and must be repaired.
4.
If measurements are correct and all fuses ae normal, do the following:
4.1
Disconnect batteries from the UPS either by switching of the battery circuit breaker or by removing
the battery fuses.
4.2
Transfer the load to bypass.
4.3
Cancel the battery test and verify that the dc voltage returns to the same high value.
4.4
Shut down the bottom UPS module (“Operation > Turn on/off > Modules off”, select the module in
question on the screen and choose “Complete shutdown”).
See if the dc voltage returns to a normal value. If so, you have found the problematic module.
Replace the module.
4.5
If the dc voltage did not return to normal, switch the module back on
(“Operation > Turn on/off > Modules on”),
then shut down next module and see if the dc voltage returns to a normal value.
Continue likewise until you have checked all of the modules, using the “complete shutdown”
command.
