Troubleshooting & repair, Leads x2 and x3 negative capacitor bank buss bar – Lincoln Electric WIRE-MATIC 255 SVM 119-A Manuel d'utilisation
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F-14
TROUBLESHOOTING & REPAIR
F-14
WIRE-MATIC 255
STATIC SCR RECTIFIER ASSEMBLY TEST (CONTINUED)
TEST PROCEDURE
1.
Disconnect main AC input power to
the machine.
2.
Disconnect Plugs J3 and J6 from
the G2803 Control Board. This
electrically isolates the SCR bridge
assembly. See Figure F.2.
FIGURE F.2 - Remove Plugs J3 and J6
to Perform Static SCR Rectifier
Assembly Test.
3.
Verify that the capacitors have com-
pletely discharged with an Analog
Volt-Ohm meter.
4.
Disconnect leads X2 and X3 from
the negative capacitor bank using a
1/2" open end wrench. See Figure
F.3.
FIGURE F.3 - Location of Leads X2
and X3.
5.
Separate leads X2 and X3 from the
negative capacitor bank buss bar.
Be sure there is no electrical con-
tact. See Figure F.3.
J2
J7
J4
J10
J6
J9
J3
J5
J1
G2803
WM-255 CONTROL
LEADS
X2 AND X3
NEGATIVE
CAPACITOR
BANK
BUSS BAR