Troubleshoot The AC Circuitry 15-60KW TQG Generator: *Component Identification and function. * AC Circuits - Schematics - Wiring Diagram

G1, AC Generator: 2 A brush-less type generator having a DC field revolving within stationary AC windings called a Stator. AC current is distributed from the generator through leads connected to the stator windings marked T0-T12. CT1, CT2,CT3, Current transformers: Measure current output from G1. CT1-CT3 provide an AC signal to the A3(Kilowatt Transducer), A4(Load Measuring Unit), and the K8(Overload/Short Circuit Relays).

K1, AC Circuit Interrupter: When energized by the S5, it’s contacts, seen below, will and close and allow current from the G1(Main Generator), to Flow to TB2(Load Terminal Board). DC Schematic

TB1, Voltage Reconnection Board: TB2, Load Terminal Board: Enables the operator to select high(240/416) or low(120/208) voltages. TB2, Load Terminal Board: Enables the operator to connect various loads to the generator.

Main Generator Output DC Input

Ammeters are placed in series with a Note: Ammeters are placed in series with a circuit to obtain a reading. If we placed an ammeter is series with two “HOTS” It would create a short. The S6 has been designed so that we will not read phase to phase current. S6, AM/VM Transmitter: Allows the operator to monitor voltages of any phase to phase or phase to neutral and current of any phase to neutral while the set is in operation. S6, AM/VM Switch: A six wafer switch. It has six separate Wafers and six positions. The six positions are: L1 – LO L2 – LO L3 – L0 L1 – L2 L2 – L3 L1 – L3

A4, Load Measuring Unit: M1, AC Volt Meter: M8, AC Ammeter: A solid state device that receives an AC input from the Main Generator. Additionally, it receives a signal proportional to the load from the current transformers. This reactive current signal is then felt at A3(Kilowatt Transducer), and provides S6 with a potential for M8. M1, AC Volt Meter: Indicates AC Voltage output of the Main Generator from phase to phase or phase to neutral. M8, AC Ammeter: Indicates AC Amperage output of the Main Generator from phase to neutral.

A3, Kilowatt Transducer: A solid state device that receives an AC input from the current transformers. It converts the AC signal to DC so that it can be read by the M-9, Kilowatt meter. M9, Kilowatt Meter: Indicates a reading of the Kilowatts being used by the load. This reading is a percentage of the total Kilowatts available.

Voltage Monitoring L1 – L2

VOLTAGE MONITORING L1 – L2

Voltage Monitoring L1 – L0 Current Monitoring CT1

Positions Four, Five and Six are for voltage and current monitoring. Voltage Monitoring L1- L0 Current Monitoring L1- L0 AC Output from main Generator. Positions Four, Five and Six are for voltage and current monitoring. Phase to Neutral(Low Voltage)

VOLTAGE MONITORING L1 – L0

CURRENT MONITORING L1 – L0

By increasing or decreasing the amount of DC current Manual Voltage Adjust. By increasing or decreasing the amount of DC current across the exciter field coil, we can increase or decrease the output voltage of the generator .

R1, Voltage Adjust Potentiometer: A variable resistor that enables the operator to increase or decrease the output of the generator from the control panel. A1, AC Voltage Regulator: A solid state device that receives an input from T1(Potential Transformer), CT5(Droop Current Transformer) and T7(Generator Phase Winding), that is directly proportional to the load current. It then sends an output signal to F1 & F2(Exciter Stator). S12, Frequency Selector Switch: A two position switch that allows the operator to select 50HZ or 60 HZ operation. In the 50 HZ position The R16 is bypassed. R16, Voltage Adjust Resistor: Provides the S12 with a predetermined amount of resistance when the generator is operating in a 50 HZ mode.

Manual Voltage Adjust

monitor the generator set Frequency Monitoring. Allows the Operator to monitor the generator set frequency.

A7, Frequency Transducer: Frequency Monitoring Components A7, Frequency Transducer: A solid state device that receives an input from G1. It then converts this signal into DC and provides M2(Frequency Meter), with a DC signal that is proportional to the generator set frequency. M2, Frequency Meter: Indicates the generator set frequency. Receives a DC signal from the A7.

Frequency Monitoring