Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 208)

208 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Appendix E Detailed CGCM Unit Tag Descriptions
• PMG_Shunt_Select - This tag selects whether the CGCM unit receives
power-input voltages from the generator’s 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
applied to the CGCM unit is single or 3-phase.
Outputs from the 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.
General Excitation Control
Modes This section describes the excitation control modes inputs and outputs for the
CGCM unit.
Inputs to the CGCM Unit
• SoftwareExcEn – This tag is controlled by the host Logix controller, and
if set to 1, provides one of the necessary conditions for the field excitation
to be enabled.
Outputs from the CGCM Unit
• Internal_Tracking_En - When this tag is set to 1 the CGCM unit enables
internal tracking between the various regulating modes.
• InternalTrackRate - This tag configures the rate at which the tracking
mode of the CGCM 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 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 unit’s Tracking mode were allowed to instantly track the full-on
condition created by the loss of sensing, the transfer to the CGCM unit’s
Manual mode results in an undesirably high generator voltage even when
operating in FCR mode. Adding a tracking delay enables the unit to
transfer to a different Regulating mode without letting the CGCM unit
follow into a potentially undesirable operating point.