Start-Up From "Maintenance" Position (External Maintenance Bypass Cabinet) - Liebert 300 series Installation, Operaton & Maintenance Manual

The three Rotary Switch positions are:
1.
Maintenance: connects power to
critical load through the external
maintenance bypass line. UPS module is de-
energized for maintenance purposes.
2. Test: connects power to the input of the
UPS module, while the load is still supplied
through the external Maintenance Bypass
Line. At this point operational checks can be
accomplished on the UPS module while the
load is powered by the external maintenance
bypass.
3. On-Line: connects the critical load to the
output of the UPS module and establishes
normal operation.
Start-up from "Maintenance" Position
(External Maintenance Bypass Cabinet)
start-up must be performed by Liebert
Initial
service personnel. Start-up procedures described
in this manual refer to start-up of the UPS after
a shutdown for maintenance or after an
abnormal condition has been corrected.
I
NOTE: Your unit may include the following optional components: Input CB.
ROTARY
POSITION
MAINTENANCE
TEST
ON-LINE
Figure 5-P. Block Diagram of the External Maintenance Bypass
the
Isolation Transformer, and Output (Load) CB.
SWITCH
SW5
Closed
Closed
Open
CAUTION
Start-up must be performed exactly as
instructed. Turning the rotary switch too
soon or in the wrong sequence may
result in immediate loss of power to the
critical load.
Step
1. Verity the UPS module rotary switch is
in poSition 0 or position 1, and external
maintenance bypass cabinet rotary switch is
in "Maintenance" position.
Step 2. Close circuit breaker or switch to apply
power to external maintenance bypass
cabinet &m user's supply source (not part.
of the UPS).
3. (if applicable) Close optional input
Step
circuit breaker on the external maintenance
bypass cabinet.
4. (if applicable) Close optional output
Step
circuit breaker on the external maintenance
bypass cabinet.
SW6
Open
Closed
Closed Closed