Table of Contents
Advertisement
Limit defines the maximum per unit load share error reported to the host
controller.
Rate defines the maximum change in the load share error per CGCM-DLR unit
update cycle, expressed in percent of rated kilowatts per second. For example, if a
change of load of 50% is required and the rate set for 10% per second, the change
takes 5 seconds to complete. The CGCM-DLR unit has an internal relay that
isolates the load share circuit whenever the function is not active or when control
power is not present.
Series B units do not isolate when control power is lost. An external relay
IMPORTANT
must be used.
Metering
The CGCM-DLR unit provides true RMS metering that is based on voltage and
current samples that are obtained from the current and voltage inputs. All
monitored parameters are derived from these values. Accuracy is specified as a
percentage of full scale, at 25 °C (77 °F) across the frequency range of the
controller, at unity power factor. Metered parameters are communicated to the
host Logix programmable controller via the Unscheduled Read table.
The
Metered Parameter Accuracy
accuracy.
3-phase generator side metering is independent of the Synchronization mode in
one or two breaker schemes. In the two-breaker scheme, single-phase bus side
metering is provided only for the selected bus.
See the Specifications,
Power System Sign Conventions
current values.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
CGCM-DLR Unit Operation
table lists all metered parameters and their
Appendix
D, for information on metering accuracy. See
on
page 71
for the sign convention of power and
Chapter 3
69
Advertisement
Table of Contents
