Lincoln Electric 50448 Service Manual page 53

FEEDER CONTROL BOARD TEST (continued)
Y035-1
Feeder
Control Board
Figure 1 - Feeder control board
TEST PROCEDURE
Use always electrically insulate gloves during this test procedure
1. Remove input power from the wire feed unit.
2. Perform the wire feeder case removal procedure.
3. Located the Feeder Control Board. See Figure 1. Do not remove the plugs from the Motor Control Board.
4. Visually check for burned or damaged components. If any components are physically damaged the motor control
board has to be replaced.
5. Apply the correct input power to the wire feeder connecting it through control cable to the power source.
6. Using the multimeter perform the tests as indicated in Test Table 1. See Figure 1a for correct test points location.
Test table 1 – Feeder Control Board test – LF52D
Test Points Expected reading
X3 pin 4 (+) to
pin 3(-)
0VDC = Gas solenoid
X4 pin 2(+) to
pin 1(-) 22,5VDC = Gas solenoid
X8 pin2(+) to From 2VDC to 30VDC
pin 3(-)
X8 pin 5(+) to
pin 4(-)
X8 pin 6(+) to Approx. 2,5VDC
pin 4(-) when motor is running
X8 pin 6(+) to
Depend upon where the
pin 4(-)
motor is stopped
X2 pin 4(+) to
pin 3(-)
-
-
PCB LEDs status
and color
40VDC
OFF
ON
+5VDC
0VDC or 5VDC
40VDC
LED - V27 Red
-
LED – V28 Green
-
For LF52D
LED
V27
LED
V28
Figure 1a – Y035-1 Test point locations
- +40VDC power supply from power source
Press the gun trigger or purge switch to test the gas solenoid power
-
supply. Note: solenoid is supplied with a PWM signal
Press the gun trigger for this test. Expected reading dependent upon
-
-
- Press the gun trigger to do this test. Tachimeter feedback from motor
- Tachimeter feedback with motor not running.
- User Interface +40VDC power supply
Lights on when wire drive motor is supplied
Arclink connection state. Normal status is steady green. If blinking all
the time it means, no communication or connection with the power
source. (Blinking during start-up is normal)
X4
Note
WFS potentiometer setting
Tachimeter voltage supply
X2
X3
X8