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Appendix E
Detailed CGCM-DLR Unit Tag Descriptions
General Excitation Control
Modes
222
• PMG_Shunt_Select - This tag selects whether the CGCM-DLR unit
receives power-input voltages from the generator terminals (shunt) or
from a permanent magnet generator (PMG). If PMG is selected, then the
information for the PMG Phase Select parameter must be provided.
• PMG_1Ph_3PhSelect – This tag configures whether the PMG power
that is applied to the CGCM-DLR unit is single or 3-phase.
Outputs from CGCM Unit
• ConfigRcvd – This tag reports whether a valid Configuration has been
received from the host Logix controller. A 1 indicates a valid
configuration. This bit must be a 1 to allow scheduled data transfers to
occur.
• UnschdWriteRcvd – This tag reports whether a valid Unscheduled Write
has been received from the host Logix controller. This bit must be a 1 to
allow scheduled data transfers to occur.
This section describes the excitation control modes inputs and outputs for the
CGCM-DLR unit.
Inputs to CGCM Unit
• SoftwareExcEn – The host Logix controller controlls this tag and if set to
1, provides one of the necessary conditions for the field excitation to be
enabled.
Outputs from CGCM-DLR Unit
• Internal_Tracking_En - When this tag is set to 1 the CGCM-DLR unit
enables internal tracking between the various regulating modes.
• InternalTrackRate - This tag configures the rate at which the tracking
mode of the CGCM-DLR unit matches the non-active excitation control
modes to the active excitation control mode.
• InternalTrackDly - This tag changes the initial delay of the tracking
function of the CGCM-DLR unit to prevent the Tracking mode from
adjusting the non-active modes into an undesirable condition. For
example, while the unit is operating in AVR mode the sensing VT fails to
open. If the CGCM-DLR unit Tracking mode is allowed to track instantly
the full-on condition that is created by the loss of sensing, the transfer to
the CGCM-DLR unit Manual mode results in an undesirably high
generator voltage even when operating in FCR mode. The addition of a
tracking delay enables the unit to transfer to another Regulating mode
without letting the CGCM-DLR unit follow into a potentially
undesirable operating point.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
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