Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 50)

50 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Chapter 3 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.
Limiting Functions
This section discusses the different types of limiting functions the CGCM unit
provides.
• Volts/Hertz Limit
• Over-excitation Limit
• Under-excitation Limit
Generator Capability Curve
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.
Figure 30 - Typical Generator Capability Curve
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Lagging
Leading
Reactive Power
, per Unit
Rating PF
Lagging
Armature Winding
Heating Limitation
Prime Mover
Power Limitation
95% PF
Leading
Armature Core
End Iron Heating
Limitation
Field Winding
Heating Limitation
Real Power, per Unit