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G-3
ELECTRICAL DIAGRAMS
DC 655
G-3
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Control Board Schematic (G3384)
PROTECTION
CURRENT
PEAK
OVER
PROTECTION
CURRENT
REFERENCE
POT FAULT
IDLE ZERO
CV FEEDBACK
>15 AMP
SWITCH
CURRENT
CVI
CV CURRENT LIMITING
REFERENCE
START
Ico
315
INTERFACE
THERMAL FAN/
318
SNUBBER PCB
TO
LOW
DOWN
SHUT-
HOLD
CV SUBARC FEEDBACK
0.5 SEC TIMER
CURRENT SWITCH
CONTROL
AMPLIFIER
GAIN=27
SWITCHING
MODE
TIMER OUTPUT
CURRENT FEED
BACK
CONTROL POT
-10V
REFERENCE
CV
BUFFER
VFB
REFERENCE
BUFFER
SIGNAL
317
ENABLE
OPEN
TRIGGER
315
HOT START
IDLE SHUTDOWN
OUTPUT STUD
DIGITAL METER PCB
TO (+)
TIMER INPUT
TIMER
317
THERMAL FAN/
SNUBBER PCB
TO
POWER SUPPLY
FIRING
SLOPE
BUFFER
INTERCEPT
BUFFER
ARC FORCE
Vco
REFERENCE
CC CONTROL
TIMER
CHIP
PCB
TO
FIRING
PROTECTION
AMPLIFIER
CURRENT
TO OPTIONAL
TO OPTIONAL
DIGITAL METER PCB
201
201
DIGITAL METER PCB
202
202
COM
REF
TO OPTIONAL
CC
VFB
BUFFER
A.C. PROTECTION
SHORTED SCR
A
G3384
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail-
able from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in
danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.
G3384
A