16
UPS for 400 Vac Grid, Installation Guide, doc. rel. 3.0
19. If you are using more than one battery set,
perform the following steps:
19.1 Verify proper polarity of the battery
connections to the UPS according to
Figure 13.
19.2 Connect the batteries as per Figure 13.
Leave SW1 through SW4 open (“OFF”).
Verify polarity in each battery set.
19.3
Switch “ON” SW1 and SW2, and measure
the voltage across SW3 and SW4.
If the voltage difference across SW3 or
SW4 is greater than 10V, charge the
battery set that has the lowest difference,
until the differences across SW3 and SW4
are less than 10 V.
19.4 Turn off all battery CBs.
Batteries are connected and
OFF.
Negative pole to midpoint
has a negative
voltage = 400V (± 8 %).
Positive pole to midpoint has
a positive
voltage = 400V (± 8 %).