Operation

3.4Faults, Alarms, Status

This section defines the active fault, alarm, and status indicators, their causes, and the associated system operations performed upon their detection.

3.4.1Faults

A fault is defined as an undesirable system operating condition that could cause further damage to the system or potentially drop the load. Once detected, faults may trigger an appropriate emergency action such as transferring the load to an alternative power source. Many fault conditions can only be resolved through Operator intervention or service by an LGS technician.

A fault condition must be valid for a certain amount of time before it is recognized as an active fault. This prevents spurious signals from causing false fault detection and unnecessary state changes.

All fault occurrences are time-stamped and recorded in the Event Log for later analysis, and sent to the Operator display.

Fault Messages

Fault messages are displayed in reverse video, as compared with alarm messages which are displayed in regular video.

The following faults are detected by Rectifier DSP.

Battery Overcharge

Battery Fuse Fail

Battery Low Transfer

DC Overvoltage Transient

Input Phase Rotation Error

Rectifier Fuse Fail

Rectifier Drive 1 Fail

Rectifier Drive 2 Fail

Trap Fuse Fail

Delta/WYE Current Imbalance

The following faults are detected by Inverter DSP:

Bypass Frequency Error

Bypass Overload Shutdown

Bypass Phase Rotation Error

IDC Peak

IGBT Drive Fail

Inverter Overload Transfer

Inverter Fuse Fail

Output Overvoltage Transfer

Output Undervoltage Transfer

SBS SCR Open

SBS SCR Shorted

Inverter current Limit Transfer

Inverter DC Offset

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Liebert 30-130kVA manual Faults, Alarms, Status