Liebert PSP Site Wiring Fault Indicator (Red), Transfer Voltage Selectors (DIP Switches)

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.)

Transfer Voltage Selectors (DIP Switches)

The two-position DIP switch control on the rear panel, as shown

above, allows the operator to select the utility transfer voltage at

which the UPS will switch to battery power. The factory default set-

tings are 100VAC - 135VAC. DIP switch positions for each voltage set-

ting are as follows:

DIP switch settings

Left Right Nominal Utility Setting

↑ Up ↑ Up 120VAC 100 - 135VAC (default)

↑ Up ↓ Down 110VAC 100 - 145VAC

↓ Down ↑ Up 127VAC 90 - 135VAC

↓ Down ↓ Down 120VAC 90 - 145VAC

!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.

Rear of UPS DIP Switches

Site Wiring Fault

Indicator (Red)