Allen-Bradley 1407-CGCM, User Manual, Page: 50 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Operation
The tag SetptTraverseActive = 1 when the CGCM unit is traversing between
the internal tracking setpoint and the new operating mode's setpoint. The tag = 0
when the operating point has completed traversing to the new mode's setpoint.
This tag is used by the host Logix controller to determine when the new mode
has taken control.
,IMITING&UNCTIONS
This section discusses the different types of limiting functions the CGCM unit
provides.
•
Volts/Hertz Limit
•
Over-excitation Limit
•
Under-excitation Limit
'ENERATOR#APABILITY#URVE
The generator capability curve graphically depicts the combinations of real and
reactive power a generator is able to produce (or absorb, in the case of reactive
power) without damage caused by overheating. The CGCM unit provides a
number of limiting functions designed to maintain operation within safe areas of
the generator capability curve.
A typical generator capability curve is shown in the following illustration.
&IGURE4YPICAL'ENERATOR#APABILITY#URVE
,AGGING
,EADING
2EACTIVE0OWER
PER5NIT
2ATING0&
,AGGING
!RMATURE7INDING
(EATING,IMITATION
0RIME-OVER
0OWER,IMITATION
0&
,EADING
!RMATURE#ORE
%ND)RON(EATING
,IMITATION
&IELD7INDING
(EATING,IMITATION
2EAL0OWERPER5NIT