Installation, Operation And Maintenance Manual; Shutdown To "Maintenance" Position; Complete Shutdown - Liebert 300 series Installation, Operaton & Maintenance Manual

Step 5. Turn the rotary switch on external
position.
Step 6. Tmn the rotary switch on UPS module
3.6.1 Start&p Procedure for details).
Step 7. Turn the rotary switch on UPS module
to position "UPS Start" and follow
2
instructions on the UPS Advisory Display
(refer to Section 3.6.1 Start-up
Procedure for details).
Step 8. Turn the rotary switch on the UPS
module to position 3 "UPS Check" and follow
instructions on the UPS Advisory Display
(refer to Section 3.6.1 Start-up
Procedure for details).
Step 9. Turn the rotary switch on the external
maintenance bypass cabinet to the "On-
Line" position.
Step 10. Turn the rotary switch on the UPS
module to position 4 "On UPS" and follow
instructions on the UPS Advisory Display
(refer to Section 3.6.1 Start-up
Procedure for details).
Start-up is now complete. No further actions are
required of the operator unless an abnormal
condition occus.

Shutdown to "Maintenance" Position

To remove the UPS module from service for
maintenance or other reasons while providing
power to the critical load through the external
maintenance bypass line, perform the following
steps.
Step 1. Turn the rotary switch on the UPS
module counterclockwise from position 4 to
position 3 and observe the instructions on
the UPS Advisory Display (refer to Section
3.8.1 Shutdown to Maintenance Bypass
for details).
Step 2. Turn the rotary switch on the UPS
Modules counterclockwise from position 3 to
position 2 to position 1. Do not turn the
rotary switch to Position 0 at this time.
Doing so would cause an immediate loss of
power to the load. There is no power to the
UPS module control system in this position.
Therefore the digital display will be blank.
Step 3. Turn the Rotary Switch on the external
maintenance bypass cabinet to the "Test"
position and then to the "Maintenance"
position.
Step 4. Turn the rotary switch on the UPS
module counterclockwise from position 1 to
position 0. At this point the UPS module will
be electrically de-energized.

Complete Shutdown

Step 5. (if applicable) Open optional output
circuit breaker on the external maintenance
bypass cabinet.
Step 6. (if applicable) Open optional input
circuit breaker on the external maintenance
bypass cabinet.
Step 7. Open the circuit breaker or switch that
supplies power to the external maintenance
bypass cabinet (not part of the UPS system).