Tsurumi TPG-2900H-DX - Manual (Page 30)

5. TROUBLESHOOTING
The procedures that follow together with the fault isolation tables can be used as a guide to isolate gen-
erator faults. Refer to these procedures when the engine fails to start after several attempts, or when
electricity is not available at the receptacles.
Before testing generator components, determine if the failure is located in the generator head or in the
control panel. Do this by following the instructions below.
If, after following these procedures, your generator fails to start or generate electricity, contact the near-
est Tsurumi generator dealer.
A. ISOLATING FAULT TO THE GENERATOR OR TO THE CONTROL PANEL
(1) This unit uses permanent magnets built into the rotor for initial excitation. Do not “flash the
fields” to try to re-excite the field.
(2) Isolate the defect by disconnecting the red, white, black and blue wires from the stator (do
not disconnect the two yellow wires). Then measure the AC voltage of each AC coil.
(3) Check for 120 vac (±5%) from the red-white wires and then check for 120 vac (±5%) from the
black-blue wires.
(4) If the voltage is correct, the failure is in the control panel. If the voltage is too low from either
coil, the defect lies in the rotor, stator, or condensers.
B. MEASURING INSULATION RESISTANCE (refer to Figure 20)
(5) No AC output - Measuring Insulation Resistance
(6) Use a megger tester to test each component for prop-
er insulation. An insulation resistance of 1 M
Ω
or
greater is normal. The insulation resistance from the
factory is at least 10 M
Ω
.
(7) Insulation Resistance - Stator
(a) Measure the insulation resistance between
BLUE lead and the core.
(b) Measure the insulation resistance between
WHITE lead and the core.
(c) Measure the insulation resistance between
YELLOW lead and the core.
(d) Measure the insulation resistance between
BROWN lead and the core.
(8) Insulation Resistance - Rotor
(a) Measure the insulation across one of the sol-
dered terminals of the rotor and the core.
(b) Parts with insulation resistance of less than
1M
Ω
have faulty insulation, and may cause
electric leakage and electric shock. Replace
the faulty part.
Page 27 Troubleshooting
Tsurumi’s Operation, Service, and Repair Manual
Figure 20: Measuring Resistance