
3.4.4Automatic Module Off-Line
For specified UPS module faults, the control logic will initiate an automatic isolation and shutdown of the UPS module. In the Module
The following UPS module faults will initiate an automatic Module
DC
Hardware Shutdown
Inverter Fault
Overload Shutdown
Rectifier Fuse Blown
Reverse Power
Refer to Table 1 for more information regarding these alarm messages.
3.4.5Automatic Emergency Modules Off
For the specified UPS system fault, the control logic will initiate an automatic transfer to bypass followed imme- diately by a shutdown and isolation of the UPS system. In the Emergency Modules Off mode the output, battery (MBD), and input circuit breakers at each UPS module are open. The System Bypass Breaker (SBB) will be closed if the bypass line is available. Emergency Modules Off is illustrated in Figure 54.
The following UPS system fault will initiate an automatic Emergency Modules Off:
Output Over Voltage
Refer to Table 1 for more information regarding alarm messages.
NOTE
A load transfer to the bypass line will be completed whenever an automatic transfer to bypass is initiated and the bypass line is available. If the OK to Transfer condition is present, the load transfer will be uninterrupted. If the Static Switch Unable alarm message is present for any reason, the automatic transfer will be interrupted for 40 to 120 milliseconds. Because of the reliability of the UPS components, an interrupted load transfer is a very unlikely occurrence.
Your installation may include a Remote Emergency Power Off mode that can be initiated automatically by a contact closure in the critical load equipment. Refer to 3.2.8 - Emergency Power Off.
Operation 105