Lincoln Electric POWER MIG SVM165-A - Manual (Page 41)

E-7 E-7
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WIRE DRIVE MOTOR AND FEED-
BACK
The Wire Drive Motor is controlled by the Feeder Board
and the Weld Control Board. A motor speed feedback
signal is generated at the motor Tach and sent to the
Feeder Board, which compares this feedback signal to
the commands from the Encoder. It then sends the
appropriate armature voltage to the Wire Drive Motor.
This controlled wire drive speed in turn regulates the
electrode wire feed speed through the gun.
THEORY OF OPERATION
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.7 – WIRE DRIVE MOTOR AND FEEDBACK
IGBT
+
LINE
SWITCH
RECONNECT
PANEL
MAIN
TRANSFORMER
RELAY
SPOOL
GUN
BOARD
FEEDER
BOARD MSP
BOARD ENCODER
BOARD DISPLAY
BOARD
RS232
CONNECTOR WELD CONTROL BOARD
SPOOL GUN
PUSH-PULL
SWITCH
WIRE DRIVE
MOTOR
OUTPUT
RECTIFIER CHOPPER
ASSEMBLY
OUTPUT
CHOKE
CURRENT
TRANSDUCER
GUN
POS
OUTPUT
TERMINAL
NEG
OUTPUT
TERMINAL
POWER
BOARD
DIODE CONTROL
RECTIFIER
FAN
MOTOR
FOOT AMPTROL OR REMOTE (6-PIN AMPHENOL)
SPOOL GUN OR PUSH-PULL GUN (7-PIN AMPHENOL)
GAS
SOLENOID
SEC
THERMOSTATS
_
+
115
VAC
30
VAC
60
VAC
80
VAC
40 VDC
40
VDC
40 VDC
24 VDC
20 VDC
PWM
SIGNALS
+15/-15/+5 VDC
SHIELDED
CABLE
GUN TRIGGER AND THUMB SWITCH
SHIELDED CABLE AND SPI COMMUNICATIONS ARCLINK
+5 VDC
CURRENT
FEEDBACK
VOLTAGE
FEEDBACK
FROM WELD
CONTROL BOARD
TO FAN RELAY
IGBT
DRIVE
T
A
C
H
CHOPPER
(Below code 10900)
Mechanical Encoders
(Above code 10900)