GE Industrial Solutions Entellisys System User Manual - Manual (Page 217)

Alarms and events description and system troubleshooting guide 217
A
Alarm Dropout Overfrequency Alarm only overfrequency relay has dropped
out of pickup
Voltage Below Overfreq Alarm
Blocking Voltage The voltages on all three phases have
dropped below the alarm only overfrequency
blocking voltage threshold.
Voltage Above Overfreq Alarm
Blocking Voltage The voltage on at least one of the three
phases has exceeded the alarm only
overfrequency blocking voltage threshold.
Pickup Overfrequency Overfrequency relay has entered pickup
Breaker Trip Overfrequency Overfrequency relay has operated
Dropout Overfrequency Overfrequency relay has dropped out of
pickup
Voltage Below Overfrequency
Blocking Voltage The voltages on all three phases have
dropped below the overfrequency blocking
voltage threshold.
Voltage Above Overfrequency
Blocking Voltage The voltage on at least one of the three
phases has exceeded the overfrequency
blocking voltage threshold.
Relays - Bus Differential
Pickup Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has
entered pickup
Dropout Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has
dropped out of pickup
Breakers Trip Bus Diff Zone 1…4
Settings 1 Bus differential for zone 1…4, settings 1 has
operated and tripped the breakers
Breakers Trip Backup Bus Diff
Zone 1…4 Settings1 Bus differential backup for zone 1…4, settings
1 has operated and tripped the breakers
Pickup Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has
entered pickup
Dropout Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has
dropped out of pickup
Breakers Trip Bus Diff Zone 1…4
Settings 2 Bus differential for zone 1…4, settings 2 has
operated and tripped the breakers
Breakers Trip Backup Bus Diff
Zone 1…4 Settings2 Bus differential backup for zone 1…4, settings
2 has operated and tripped the breakers
Alarm Pickup Bus Diff Zone 1…4
Settings 1 Alarm only bus differential for zone 1…4,
settings 1 has entered pickup
Table A-2 Sequence of events description and troubleshooting guide
Event Description Notes and Troubleshooting tips