UPS for 480 Vac Grid, User Guide, doc. rel. 4.0
70
To disconnect all of the other modules from the system rack disconnect the PFC and inverter
ribbon cables and slide the module out by at least 3 inches.
6.
Wait for the UPS to transfer to Normal mode and charge the battery Main>status.
If the power module does not automatically start pre-charge, select and manually turn on the
module, main>operation>turn on/off>modules on.
7.
Verify that the dc relay is ON. Main>status>modules>PFC status.
8.
Turn off the battery CB.
9.
Measure voltage between the negative (“– “) dc bus and midpoint bus bar, see Figure 45: dc
bus terminals.
You would expect the value to be around -435Vdc, ± 10 V.
10.
Compare your measured value to the -435Vdc nominal power module dc voltage.
11.
Adjust Negative DC voltage up or down accordingly to acquire the desired negative dc
voltage.
12.
Press confirm.
13.
Wait 5 seconds and verify that the negative dc voltage has changed accordingly.
14.
Measure voltage between the positive (“+ “) dc bus and midpoint bus bar, see Figure 45: dc
bus terminals.
You would expect the value to be around 435Vdc, ± 10 V.
15.
Compare your measured value to the 435Vdc nominal power module dc voltage.
16.
Adjust Positive DC voltage up or down accordingly to acquire the desired positive dc
voltage.
17.
Press confirm.
18.
Wait 5 seconds and verify that the negative dc voltage has changed accordingly.
19.
Turn on the battery circuit breaker.
20.
Switch OFF the module just calibrated and switch ON the next module above it.
21.
Repeat steps 5 through 18 until all modules have been calibrated.
You have completed dc bus voltage adjustment for all power modules.
8.2.2.9.
SERIAL NUMBER
Use this function to record the serial number of each UPS power module in memory, for easy
reference.
