Portable Generator User Manual

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4-4) MEASURING INSULATION RESISTANCE

Use a “Dr. Robin” generator tester in megger tester

mode or use a megger tester to check the insulation

resistance. Connect a megger tester to one of

receptacle output terminals and the ground terminal,

then measure the insulation resistance. An insulation

resistance of 1 megohm or more is normal. (The original

insulation resistance at the time of shipment from the

factory is 10 megohm or more.) If it is less than 1

megohm, disassemble the generator and measure the

insulation resistance of the stator, rotor and control

panel individually.

NOTE : Connect across the two output terminals of a

receptacle using a wire as shown in the figure

right before checking.

Wire

(2) STATOR

Check the insulation resistance between red lead

and core, blue lead and core, and white lead and

core respectively. Should any reading is less than 1

megohm, the stator is faulty.

(3) CONTROL PANEL

Measure the insulation resistances between the live

parts and the grounded parts.

NOTE : Connect across the two output terminals of a

receptacle using a wire as shown in the figure

right should the inverter unit is still connected to

the control panel.

Wire

Any part where the insulation resistance is less than 1MΩ has faulty insulation, and may cause electric leakage

and electric shock.

Replace the faulty part.