MMD Equipment 400S-6B1 - Manual (Page 47)

5. Periodic Inspection/Maintenance
5-8
5.5.5 Check GFCI receptacles
[Monthly or 250 hours operation, whichever comes first.]
If the generator is stored outdoors, unprotected from the weather, test the GFCI receptacle before
each use.
In case the GFCI has tripped due to the hazard of ground fault currents, investigate the cause and
correct it.
Regularly check the GFCI operation for safety.
<Procedure>
① Unplug all appliances from the generator.
② Start the engine.
③ Turn each single-phase and three-phase breaker ON.
④ Press the TEST BUTTON
The RESET BUTTON should extend with a click.
If the RESET BUTTON does not extend, contact your
nearest dealer.
⑤ Press the RESET BUTTON
⑥ When the RESET BUTTON extends during peration.
Unplug all appliances from the GFCI protected
receptacle.
Press the RESET BUTTON:
IF THE GFCI CANNOT BE RESET: The GFCI is faulty. Contact your nearest dealer.
IF THE GFCI RESETS PROPERLY: Check the appliance or the power cord.
5.5.6 How to check thermal relay
[Every 250 hours]
<Procedure>
① Turn the starter switch to ON.
② Set the main breaker to ON.
③ The three phase main breaker will trip if you push
the test lever of the thermal relay in the arrow
direction.
④ Note that once the three phase main breaker trips
to the off position, the single phase breaker that
supplies power to the GFCI outlets can still be ON.
Reset button
Test button
A040270
A060468
Thermal relay
Test lever
Push