SECTION 1: COMPONENT FUNCTIONA.A. C. Metering and Generator Control1.A. C. Ammeter(AM)a.Reads the generator load on each phase of the generator. Generator full load rating is 243 amps.2.A. C. Voltmeter(VM)a.Reads the generator voltage between any two phases. Voltage should read 460 volts at all timeswhen generator is running. Voltage can be adjusted the volt adjust rheostat located under thevoltmeter switch. Voltmeter can be calibrated for scale by checking the actual voltage at the breakerwith a calibrated voltmeter and adjusting the voltmeter pointer by the screw adjustment on the meterfront.b.The Bus voltmeter reads the voltage between phase A & B at all times and is there to compare themain bus voltage to the generator voltage when paralleling.3.Frequency Meter(FM)a.Reads the generator frequency. Frequency should always be 60 Hertz at all times when thegenerator is running.b.The bus frequency meter reads the bus frequency at all times and is there to compare the main busfrequency to the generator frequency when paralleling.4.Ammeter Switch(AS)a.Selects which phase of generator load current the Ammeter is reading. The Ammeter is scaled toread the full generator current at a ratio of 80:1 and a full scale deflection of 5 amps. So at full load of243 amps the Ammeter will receive 3.04 amps.b.The switch shorts out the current transformers that are not connected to the Ammeter which not onlyprevents high voltage build up at the open current transformer terminals but also maintains currentsensing for the reverse power relay.5.Voltmeter Switch(VS)a.Selects two phases of generator to read the voltage on. The voltmeter is scaled to read the generatorvoltage at a ratio of 4: 1 and a full scale deflection of 150 volts. So at proper voltage of 460 volts thevoltmeter will receive 115 volts.b.Also selects phase A & B of the bus for proper voltage level comparison before synchronizing.6.Voltage Adjust Rheostata.Adjust the generator voltage to maintain 460 volts at all times.PAGE 1
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
