[Note] The installation of a leakage relay on the machine can not become a reason for
elimination of the need for the load side grounding.
The load side grounding is indispensable for earliest possible detection of any
leakage caused in the generator. The absence of such grounding requires any
leakage to be detected by current flowing through the human body and is very
dangerous because the sensitivity of leakage relay provided on the machine is not
sufficient for detection of such current.
Precaution in grounding
Precaution in grounding is refer to r 4-4 (3) Precaution in grounding See p.33 j
Pilot lamp (green) Earth leakage lamp (red)
I Operation check
For safety reasons, check on the operation of the leakage relay at the startup of the machine
according to the procedure described below:
ф Start up the machine according to
r 5 - 2 Startup See p.40 j
Ф Make sure that all breakers of the load side
are OFF.
'Щ) Set the breaker of the machine to ON.
(D Press the test button on the leakage relay.
If this causes the lamp (red) on the leakage
relay to go on and the breakers to be
activated, the leakage relay can be
regarded as operating normally.
(5) Press the reset button and return the
breaker to the OFF position. This allows the
breaker to be turned to ON again.
The leakage relay, once it is activated, holds
its activated state until the reset button is
pressed or the machine is stopped.
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Test button
Reset button
(4)Action for operation of the leakage relay
When the leakage relay is activated, then stop the engine, and measure the insulation
resistance several parts and repair the leak spot before restart the engine.
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