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Liebert NXL UPS
2.4.3.1
2.4.3.1
2.4.3.1
2.4.3.1
Maintenance Bypass Load Transfers—If Load is on UPS
1)
Transfer the UPS system to bypass (see 2.4.2.1 - Load Transfer Procedures).
2)
Close the Maintenance Bypass Isolator (Q3).
NOTE
Failure to close the Maintenance Bypass Isolator (Q3) will interrupt power to the
load.
The load is not protected from normal supply aberrations when operating in the
3)
Open the following isolators: Q1, Q2 and Q4. The UPS system is now isolated from the
critical load and the load is now on Maintenance Bypass mode.
2.4.3.2
2.4.3.2
2.4.3.2
2.4.3.2
Maintenance Bypass Load Transfers—If Load is on Maintenance Bypass
1)
Close the Bypass isolators Q2 and Q4. Refer to 2.5.1 - Startup Procedure.
2)
Check if load is on bypass then open Maintenance Bypass Isolator (Q3). Follows the
Startup Procedure.
NOTE
Failure to close Maintenance Isolation Breaker (Q3) will interrupt the load.
Page 44
Operation and Maintenance Manual
CAUTION
maintenance bypass mode.
250-300-400-800kVA
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