Maintenance Bypass Operation; On 3.5 - 6 Kva Units; Transferring From Ups Operation To Maintenance Bypass Operation; Transferring From Maintenance Bypass Operation - Liebert UPStation S VM12000 User Manual

Maintenance Bypass Operation

on 3.5 - 6 kVA Units

The POD includes a Maintenance Bypass Switch that
allows UPS removal for service or maintenance without
interrupting power to the loads.
Transferring from UPS Operation to Maintenance
Bypass Operation
1. Transfer UPS to manual bypass operation via switch
SW1 on back of the UPS. The UPS beeps, indicating
bypass operation. Press the Alarm Silence button to
silence the beep.
2. With UPS in bypass, rotate the unit Maintenance
Bypass Switch (SW2) to the "Maintenance Bypass"
position.
3. Press the UPS OFF Button twice. Utility power now
supports the load. Leave the POD mounted on the
UPS. Allow only qualified service personnel to
remove it. For UPS repair or maintenance, contact
Liebert at 1-800-222-5877.
Transferring from Maintenance Bypass Operation to
UPS Operation
1. Verify the UPS manual bypass switch (SW1) is in the
"bypass" position, and the UPS output circuit breaker
is ON. (Turn the circuit breaker OFF and then ON to
reset it.)
2. Reattach unit following the instructions in the 3.5-6
kVA Startup Checklist.
3. UPS begins start-up and the manual bypass alarm
sounds. Silence the alarm.
4. Set the UPS manual bypass switch (SW1) to the
"UPS" position.
5. UPS display indicates "Start up test warning: check
messages". Press the right arrow button. If "Load on
Manual Bypass" appears, turn the UPS ON by
pressing the ON button twice.
6. Wait for the UPS display to indicate "Normal
Operation". Set unit Maintenance Bypass switch
(SW2) to the "UPS" position.
controlled power to the loads.
UPS now supplies
15

System Shutdown

Manual Off

Pressing the OFF button twice removes power to the load
by turning off the inverter and opening the bypass. The
Output Circuit Breaker remains closed, even though
output power is unavailable.
Pressing the OFF button twice disables Auto-Restart until
you press the ON button, but control logic and battery
charging remain active.
NOTE: Pressing the OFF button a third time displays a
message prompting you to press the OFF button a fourth
time. Pressing it a fourth time opens the Output Circuit
Breaker at the rear of the unit.

Remote Emergency Power Off

Each unit includes a connector to facilitate Remote
Emergency Power Off (REPO) from a customer-sup- plied
switch. An optional switch with 50 feet of cable is
available. Activating Emergency Off opens the Output
Circuit Breaker and disables battery recharge.

UPS Alarms

See the alarm chart in the Appendix for alarm message
meanings and corrective actions. Perform the corrective
action described for a specific alarm.
contact Liebert at 1-800-222-5877.
For assistance,