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[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「4-4 (3) Precaution in grounding 」.
■
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:
① Start up the machine according to
「5-2 Startup 」
② Make sure that all breakers of the load side
are "OFF".
③ Set the breaker of three phase and single
phase to "ON".
④ Press the TEST button on the leakage relay.
If this causes the LEAK 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.
(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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