Automatic Transfers To Bypass (Ups System Faults) - Liebert 610 Series Operation & Maintenance Manual

100-1000kva, 60hz three phase single-module

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3.5.4

Automatic Transfers to Bypass (UPS System Faults)

For specified UPS system faults, the control logic will initiate an automatic transfer to bypass fol-

lowed immediately by a shutdown and isolation of the UPS system. The output, battery (MBD) and

input circuit breakers are open. The bypass breaker will be closed if the bypass line is available. Note

that the bypass line is usually not available during Low Battery Shutdown. The circuit diagram is the

same as illustrated in Figure 47 for Emergency Module Off.

The following UPS system faults will initiate an automatic transfer to bypass:

DC Overvoltage Shutdown

Hardware Shutdown

Inverter Fault

Low-Battery Shutdown

Output Overvoltage

Overload Shutdown

Overtemperature Timeout

Rectifier Fuse Blown

Reverse Power

Refer to Table 4 for more information regarding these 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 automati-

cally by a contact closure in the critical load equipment. Refer to 3.3.7 - Remote Emergency Power

Off.

Operation

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