GENERATOR SET CONTROL (GSC) - Continued
to the ECM to control the speed of the engine, which determines the frequency of the output from the generator.
The GSC monitors various sensor outputs, plus the ECM sensors to enable or disable connecting the generator
to the load via Load Contactor K1. The GSC is also able to disconnect the generator from the load via Load
Contactor K1 in the event that the ECM or the GSC detects a failure that would keep the generator set from
performing its duty.
The GSC is a multi-purpose controller meant to be interfaced with a wide range of engine types and
configurations. The output from the GSC goes to a relay module inside the GSC and these relay outputs are
interconnected to the rest of the control system (refer to DC Power Distribution discussion for this interface).
There are also spare inputs and outputs described in the DC Power Distribution discussion. One of the purposes
of the GSC is to determine when the generator output is synchronized well enough with the voltage on the load
bus in order to connect the generator to the load. This can be done automatically or manually with the aid of the
synchroscope feature of the GSC.
DIGITAL VOLTAGE REGULATOR (DVR A3) MODULE OPERATION
DVR A3 (Figure 10) is a microprocessor based, digital voltage regulator. The regulator is specifically designed to
regulate the output voltage of a generator in an engine/generator set arrangement. The DVR consists of a touch
pad, digital display, CPU, voltage and current monitoring circuits and field drive circuits.
Touch Pad and Digital Display
The touch pad allows the user to input operating and alarm parameters into the DVR and to check alarm
conditions past and present. When power is applied, :01 is displayed. This is the generator output Voltage
Parameter. The touch pad allows the user to access the following data, which is displayed on the digital display:
3 Phase kVAR
Reactive Output Power
Generator Real Current