Ground test procedure, Warning – Lincoln Electric HANDYMIG 170I User Manual
Page 37
D-4
D-4
GROUND TEST PROCEDURE
WARNING ELECTRIC SHOCK can kill
WARNING: This procedure is only suitable for applica-
tions using DC mega testers up to 500V.
Note: This procedure is for
‘
machines as built
’
many
modifications could have taken place over the life of a
particular machine, so details of this procedure may
need to be
‘
adjusted
’
to suit these modifications.
For prompt service contact your local authorised Liquid
Arc Field Service shop.
The insulation resistance values listed below are from
Australian Standard AS1966.1.
•
Disconnect input power by removing plug from mains
supply.
•
Remove welding leads (gun and work lead) from the
machine before any tests are carried out.
•
Remove plug from PCB, install a shorting socket into
the harness plug. (The shorting socket is to have pins
4 & 5 jumpered together and all other pins jumpered
together separately and insulated.)
•
Connect a shorting jumper across the connections to
the capacitor and from the capacitor to each rectifier
heat sink plate.
•
Set power switch to
‘
on
’
position.
•
Input circuit test: Connect one lead of the mega tester
to the frame of the machine and the other lead to
both the
‘
active
’
&
‘
neutral
’
terminals of the 240V
input plug. Apply the test. (Minimum resistance 1M
•
)
•
Welding circuit test: Connect one lead of the mega
tester to the frame of the machine and the other lead
to the positive output stud. Apply the test. (Minimum
resistance 1M
•
)
•
Auxiliary circuit test: Connect one lead of the mega
tester to the frame of the machine and the other lead
to jumper on pins 4 & 5 in the shorting socket. Apply
the test. (Minimum resistance 1M
•
)
•
Input circuit to welding circuit test: Connect one lead-
of the mega tester to both the
‘
active
’
&
‘
neutral
’
ter-
minals of the 240V input plug and the other to the
positive output stud. Apply the test(s). (Minimum
resistance 10M
•
)
•
Input circuit to auxiliary circuit test: Connect one lead-
of the mega tester to both the
‘
active
’
&
‘
neutral
’
ter-
minals of the 240V input plug and the other to the
jumper on pins 4 & 5 in the shorting socket. Apply the
test. (Minimum resistance 1M
•
)
•
Welding circuit to auxiliary circuit test: Connect one-
lead of the mega tester to the positive output stud
and the other to the jumper on pins 4 & 5 in the
shorting socket. Apply the test. (Minimum resistance
1M
•
)
•
Wire drive test: Connect one lead of the mega tester-
to the positive output stud and the other to the drive
roll shaft. Apply the test. (Minimum resistance 1M
•
)
•
Remove all harness shorting plugs and connect all
plug and leads to PCB. Remove all shorting jumpers.
If any problems are encountered, refer to your near-
est authorised Liquid Arc Field Service Shop.
WARNING
Handymig 170i