Notice: Risk of improper operation sequence. May cause equipment damage. Failure to close the Maintenance Bypass
Breaker (MBB) will interrupt power to the load.
4. Open the Maintenance Isolation Breaker (MIB). The UPS is now isolated from the critical load and the load is
now on Maintenance Bypass.
5. If using a key interlock system, remove the key from the lock for the Maintenance Isolation Breaker (MIB).
6. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, replace the key
into the solenoid.
7. If UPS bypass shutdown is required, following instructions in UPS Shutdown—Single-Module System below.
Maintenance Bypass Load Transfers—Single Module System: If Load is on Maintenance Bypass
1. Verify that power is available to the module's bypass and rectifier inputs.
2. Verify that the UPS is started and in Bypass Mode.
3. If using a key interlock system:
a. Depress the key-release unit push button.
b. Turn the key and remove it from the key-release unit.
NOTE: The UPS is now locked in bypass and cannot be retransferred to the Inverter until the key is returned.
4. If using a key interlock system:
a. Insert the key into the lock for the Maintenance Isolation Breaker (MIB)
b. Retract the bolt.
5. Close the Maintenance Isolation Breaker (MIB).
Notice: Risk of improper operation sequence. May cause equipment damage. Failure to close the Maintenance Isolation
Breaker (MIB) will interrupt power to the load.
6. Open the Maintenance Bypass Breaker (MBB). Load is now on UPS Internal Bypass.
7. If using a key interlock system, remove the key from the lock for the Maintenance Bypass Breaker (MBB) to lock
it open.
8. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, insert the key into
the solenoid.
The UPS system may now be transferred from bypass to UPS (see Load Transfer and Retransfer—Single-Module System on
the previous page).
UPS Shutdown—Single-Module System
Follow these instructions to completely shut down and de-energize the UPS module.
NOTE: This shutdown turns Off the inverter, rectifier and bypass static switch. This will shut down the UPS
completely.
1. From the Touchscreen Control Panel, touch the on/off button located on the overview screen.
2. When prompted by the Touchscreen Control Panel, select stop inverter.
3. The load should transfer UPS bypass at this time.
4. Open all core disconnect QS4 switches
5. Open all MBD and/or battery breakers
6. Open all core disconnect QS1 switches
Vertiv™ | Liebert® Trinergy Cube™ Operation and Maintenance Guide
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