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5-5 Earth Leakage Relay
Danger : Electric Shock
z Ground every grounding terminal to the earth as set out in the manual.
If even one of all is unconnected by mistake or accident, it will be much more
dangerous for human body than the NO RELAY case, because leaking current
inevitably goes through the body.
z Even though all the terminals of the loads have been grounded to the earth, the
earth grounding terminal and the bonnet (canopy) grounding terminal should be
grounded to the earth.
z Grounding should be made after the engine is stopped.
z Whenever the earth leakage relay has activated, you should always repair the
leaking place first of all.
The equipment is provided with the earth leakage relay in the 3-Phase Circuit Breaker
to detect any leakage arisen due to the troubles as insulation failure of the load while
the generator is running. And cutting off the circuit for protection against any accident
such as electrical shock resulting from the trouble.
<Caution>
z The earth leakage relays (3-Phase 380V and 1-Phase 220V) activate the AC
to the terminals but not to receptacles.
z The 3-phase circuit breaker trips to protect the loads, whenever AC power is
used where the selector switch is in the Eco position.
The specifications of the earth leakage relay:
z Rated Sensitive Current: 30mA (or below)
(Grounding resistance: 500Ω or below)
z Sensitive time: Within 0.1 second
(1) Grounding Work
The qualified electrician should perform the grounding work of the following 3 points
(500Ω or below).
z The earth grounding terminal in the output terminals
z The Outer Bonnet of the equipment (bonnet grounding terminal)
z The Outer Bonnet of the load
<Caution>
z In the event you cannot ground the generator to the earth, consult with the
authorized distributor or our engineering section.
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