Site Wiring Fault Indicator (Red); Transfer Voltage Selectors (Dip Switches) - Liebert PowerSure PSA User Manual

Site Wiring Fault Indicator (Red)

The Site Wiring Fault Indicator on the rear panel, as shown below,
illuminates red when the UPS detects a line-neutral reversal or a poor
neutral-ground. (Refer to Troubleshooting Chart if this indicator is
illuminated.)
Rear of UPS

Transfer Voltage Selectors (DIP Switches)

The two-position DIP switch control on the rear panel, shown above,
allows the operator to select the utility transfer voltage at which the
UPS will switch to battery power. DIP switch positions for each volt-
age setting are as follows:
Left
↑ Up
↑ Up
↓ Down
↓ Down
CAUTION
!
Never change the voltage settings while the UPS is ON and
powering connected loads. Change DIP switches only when
the UPS is OFF.
CAUTION
!
To ensure protection of the connected equipment, the DIP
switch settings should match the nominal utility input
voltage. DIP switch settings not matching the nominal
utility could potentially damage connected equipment.
DIP switch settings
Right Nominal utility
↑ Up
120VAC
↓ Down
110VAC
↑ Up
127VAC
↓ Down
120VAC
DIP Switches
Site Wiring Fault
Indicator (Red)
85 - 145VAC (default)
13
Setting
78 - 138VAC
90 - 150VAC
85 - 145VAC