Earth Leakage Relay And Grounding - Shindaiwa DG150MM Owners And Operation Manual

7-3. Earth Leakage Relay and Grounding

WARNING : ELECTRIC SHOCK
 Ground the every grounding terminal to the earth as set in the manual.
 If even one of all is unconnected by mistake or accident, it will be much more
dangerous for human than the NO-RELAY case, because leaking current
inevitably goes through the body.
 Even though all the bonnets of the loads have been grounded to the earth, the
bonnet grounding terminal should be grounded to the earth.
 Grounding should be made after the engine is stopped.
 Whenever the Earth leakage relay is activated, you should always repair the
leaking place first of all.
The generator is provided with the earth leakage breaker relay to detect any
leakage produced due to such the trouble as insulation failure of the load while the
generator is running and to cut off the circuit for protection against any accident
such as electrical shock resulting from the trouble.The specification of the earth
leakage relay;
 Rated Sensitive Current: 30mA (or below) (Grounding resistance: 500Ω or below)
 Sensitive time: Within 0.1 sec.
(1) Grounding Work
The qualified electrician should perform
the grounding of the following 3 points
(500Ωor below).
 The Bonnet grounding terminal of the generator.
 The Earth leakage terminal of the generator.
 The Bonnet of the load.
< Note >
 In the event you cannot ground the generator to
the earth, consult with the authorized distributor.
(2) Operation Check
WARNING : ELECTRIC SHOCK
 Before connecting or disconnecting the load cables to/from the output
terminal, always turn the output circuit breakers to the "OFF" position, stop the
engine, and remove the starter key.
 Close the output terminal cover before operating.
 Do not touch the generator if the generator or casing becomes wet during
operation.
Before operating the generator, check always if the device can work.
● Actuation test of the Earth Leakage Relay and
Breaker
Ensure that the breaker and the switches of loads
1
are positioned to "OFF".
Ensure that the circuit breaker positioned to "OFF".
2
(Ref."4-2.Operation Panel")
Following the procedure in 9-1, Initial Startup /
3
Pre-Check,start an engine.
Earth
Leakage
Terminal
Bonnet
Grounding
Terminal
19
Grounding Rod
Circuit Breaker
Earth Leakage Relay