Earth Leakage Relay And Grounding - Shindaiwa DG25MK Assembly And Instruction 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 second.
(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 or our
gineeringsection.
(2) Operation Check
WARNING : ELECTRIC SHOCK
 Before turning the circuit breaker to ON position, ensure that the breaker or
the switch of loads are positioned to OFF.
Operate the circuit breaker, well-communicating with the electrician by the
load side.
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
1
loads are positioned to OFF.
Ensure that the circuit breaker positioned to
2
OFF. (Refer to "4-2.Operation Panel")
Following the procedure in 9-1, Initial Startup /
3
Pre-Check,start an engine.
Turn breaker to ON.
4
Push the TEST button on Earth Leakage Relay. When the button is pushed, the
5
earth leakage indicator turns ON and circuit breakers are positioned in the
middle between ON and OFF positions simultaneously, the device works
normally.
Earth
Grounding
Terminal
21
Bonnet
Grounding
Terminal
Grounding
Rod
TEST button
Indicator
RESET button
Earth Leakage Relay