Protection - Allen-Bradley 1407-CGCM User Manual

Detailed CGCM Unit Tag Descriptions
Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
• UEL_Curve_VAR_Pt4 - This tag is used as the VAR coordinate in the
fourth Watt, VAR coordinate pair, that, in combination with four other
Watt, VAR coordinate pairs, lets you enter an Under-excitation Limiting
curve.
• UEL_Curve_VAR_Pt5 - This tag is used as the VAR coordinate in the
fifth Watt, VAR coordinate pair, that, in combination with four other
Watt, VAR coordinate pairs, lets you enter an Under-excitation Limiting
curve.
• UEL_Active – This tag is set to 1 when the exciter is operating in the
Under-excitation Limiting mode.
This section describes the protection tags for the CGCM unit.
• FltReset – This tag is used by the host Logix controller to indicate to the
CGCM unit that it has observed the fault condition reported by the
CGCM unit, and wants the fault condition reset.
• FltOut – This tag indicates that one of the configured protection faults
has gone active.
• FltResetAck – This tag reports to the host Logix controller that the
activation of the FltReset tag has been received by the CGCM unit, and
the protective fault has been cleared.
• LossExcFltOutEn - When this tag is a 1 in the configuration, and a Loss
of Excitation Fault occurs (as defined by the LossExc_I_Setpt tag), the
Fault Relay is energized. When this tag is a 0 in the configuration, a Loss of
Excitation Condition has no effect on the Fault Relay.
• LossExc_I_Setpt - This tag configures the level of the CGCM unit's DC
output current that is considered to be a minimum needed to maintain
generator synchronization when in parallel with other power sources such
as a utility grid.
• LossExc_I_TimeDly - This tag configures the amount of time the
CGCM unit's excitation is below the Loss of Excitation Current Setpoint
before the CGCM unit trips the generator off line by opening the
generator breaker.