Vertiv Liebert EXL S1, Operation And Maintenance Manual

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3. Disable Test Operation Mode from the Touchscreen Control Panel of the isolated UPS module, touch OPERATE
> UNIT OPERATIONS > Test Operation Mode Activation Setup > Disable .
4. Open the external Module Battery Disconnect(s) (MBD) of the isolated module.
5. Open the external Remote Back-feed Breaker (RBB) and optional internal Back-Feed Disconnect (BFD) if
installed of the isolated module.
The Bypass Static Switch (BPSS) turns Off for the isolated module.
6. Open the external rectifier feeder breaker of the isolated module.
• External Remote Back-Feed Breaker (RBB) for single-input/feed applications
• External Rectifier Feed Breaker (RFB) for dual-input/feed applications
Once shutdown is complete, the Touchscreen Control Panel of the isolated module will turn Off.
2.6 System Load Bank Testing
Tests the system load bank, if equipped.
1. Transfer the UPS system to Bypass (see Load Transfer-1+N System: Transfer System Inverter to Bypass on
page 25).
2. Transfer the critical load to Maintenance Bypass (see Maintenance Bypass Load Transfers-1+N Module System:
If Load is on UPS Bypass on page 27).
3. Verify the Maintenance Isolation Breaker (MIB) is Open, the Maintenance Bypass Breaker (MBB) is Closed, and
the critical bus is supported by maintenance bypass.
4. Close the Load Bank Breaker (LBB) for the UPS system.
5. Transfer the UPS system to Inverter (see Load Transfer-1+N System: Transfer System from Bypass to Inverter
on page 25).
The UPS system can now be load bank tested.
6. Once load bank testing is complete, open Load Bank Breaker for the system.
7. Transfer the UPS system to Bypass ( see Load Transfer-1+N System: Transfer System Inverter to Bypass on
page 25).
8. Verify that the UPS system is on Bypass.
9. Transfer the critical load to the UPS Bypass (see Maintenance Bypass Load Transfers—1+N Module System: If
Load is on Maintenance Bypass on page 28).
10. Verify the Maintenance Isolation Breaker (MIB) is Closed, the Maintenance Bypass Breaker (MBB) is Open, and
the critical bus is supported by the UPS Bypass.
11. Transfer the critical load to UPS Inverter (see Load Transfer-1+N System: Transfer System from Bypass to
Inverter on page 25).
12. Verify the critical load is on UPS Inverter.
2.7 Module Load Bank Testing with the Critical Bus on Inverter
Tests the module load bank, if equipped, while the critical bus is on Inverter.
1. Verify that enough UPS modules will remain present to support the critical load if one module is removed from
the collective bus.
2. Turn Off the Inverter from the Touchscreen Control Panel of the UPS module to be tested: touch OPERATE >
UNIT OPERATIONS > Inverter Off > Single .
3. Open the external Module Output Breaker (MOB) on the UPS module to be load bank tested.
4. Close the Load Bank Breaker for the isolated module.
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