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Shutting Down a Parallel System
Shutting Down a Single UPS in the Parallel System
- Perform the shutdown operation for a UPS in the parallel system. Then the UPS shuts down and generates no output. Other UPSs work without being affected.
- Switch off the external battery circuit breaker (if any), or disconnect battery power cables for the UPS. The UPS exits the parallel system.
- When one UPS in the parallel system is shut down while another UPS is still working, the UPS that has been shut down has no output.
- To shut down a UPS without removing it from the system, perform only step 1.
Transferring the Parallel System to Bypass Mode
Perform the shutdown operation on each UPS in the parallel system. All UPSs shut down the inverters and transfer to bypass mode.
Transferring the Parallel System to No Output Mode
- Shut down loads.
- Perform the shutdown operation on each UPS in the parallel system. All UPSs shut down the inverters and transfer to bypass mode.
- Switch off the general AC input circuit breaker Km and the general AC output circuit breaker Q of the UPS system. After all indicators turn off and fans stop, the UPSs shut down, and the loads power off.
- Switch off the external battery circuit breaker for each UPS or the general battery circuit breaker (when all UPSs in the parallel system share a battery string). If no external battery circuit breaker is configured, disconnect battery power cables from each UPS.