CAT EMCP 4 - FUEL TRANSFER MONITORING; DEAD BUS ARBITRATION (EMCP 4.4 ONLY); GENERATOR TO BUS SYNCHRONIZING (EMCP 4.4 ONLY); GENERATOR CIRCUIT BREAKER MONITORING AND CONTROL

Application and Installation Guide EMCP 4 SCADA Data Links
©2013 Caterpillar
All rights reserved. Page 22
 Total Voltage Bias Percent (1058) – The percentage bias being applied to the voltage regulator
desired genset output voltage, as a percentage of 40% of rated, The value will increment by 0.5%
each time the Voltage Adjust up or down arrow is pressed on the EMCP 4 GSC, or any time the
Voltage Bias Percent Increment Command (1059) is written. The min/max values for this data are:
±
MAXIMUM_GENERATOR_VOLTAGE_OUTPUT_BIAS_PERCENTAGE_SETPOINT / 40%
Since the setpoint is limited to 0-100%, the absolute minimum and maximum are ± 250%.
Output voltage biasing is limited to ± 40% of rated, however, and voltage regulators may have an
even tighter range (the CDVR is ± 15%).
 Voltage Bias Percent Increment Command (1059) – Increments the percentage bias to be
applied to the Automatic Voltage Regulator. This value gets added to the Total Voltage Bias
Percent register (the bias decreases if a negative value is written). The formula is:
T
OTAL_VOLTAGE_BIAS_PERCENT = TOTAL_VOLTAGE_BIAS_PERCENT + VOLTAGE_BIAS_PERCENT_INCREMENT_COMMAND
 Voltage Compensation Bias Percent (1136) - Voltage bias as a percentage of nominal applied
based on Reactive Droop or Line Loss Compensation settings when configured for Integrated
Voltage Regulator.
 Integrated Voltage Regulator Operating State (1137) - Indicates the operating state of the
Integrated Voltage Regulator feature when configured.
 Generator Excitation Command Percentage (1138) - Reads the generator excitation command
percentage output from the Integrated Voltage Regulator feature (proportional to generator
excitation current).
FUEL TRANSFER MONITORING
 Fuel Unload Pump Active (321) (EMCP 4.2 and 4.4 only) – status
 Fuel Load Pump Active (322) – status
DEAD BUS ARBITRATION (EMCP 4.4 ONLY)
 Arbitration Relay Active Status (DDO-01) (645)
 Bus Live Status (1070)
 Dead Bus Arbitration State (1111)
GENERATOR TO BUS SYNCHRONIZING (EMCP 4.4 ONLY)
 Generator/Bus Phase Difference (1064)
 Sync Mode Switch State (1108)
GENERATOR CIRCUIT BREAKER MONITORING AND CONTROL
 Dedicated Digital Input #3 (Gen CB Aux A) Active Status (614)
 Dedicated Digital Input #4 (Gen CB Aux B) Active Status (615)
 Gen CB Trip Command Active Status (DIDI-03) (643)
 Gen CB Close Command Active Status (DIDI-04) (644)
 Gen CB Close Active Status (DDO-02) (646)
 Gen CB Trip Active Status (DDO-03) (647)
 Generator Circuit Breaker Status (1065)