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

2. 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).

3. 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

4. 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.

5. Main Generator Output
DC Input

6. 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

7. 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.

8. 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.

9. Voltage Monitoring
L1 – L2

10. VOLTAGE MONITORING
L1 – L2

18. Voltage Monitoring
L1 – L0
Current Monitoring
CT1

19. 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)

20. VOLTAGE MONITORING
L1 – L0

26. CURRENT MONITORING
L1 – L0

33. 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 .

34. 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.

35. Manual Voltage Adjust

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

44. 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.

45. Frequency Monitoring