Lincoln Electric LF-72 WIRE FEEDER IM847-D - Manual (Page 37)

D-2 MAINTENANCE D-2
6. Adjust the WFS knob to 300 ipm. Center the knob
pointer with the name plate graphics. Activate the
gun trigger.
7. Insert the shorting plug into connector J2 on the
p.c. board. The shorting plug shorts pins 1 & 5.
(See Figure D.2)
8. Remove the shorting plug. Set aside.
(For Codes below 11289 use 9 thru 17)
9. Adjust the WFS knob to minimum.
10. Insert the shorting plug into connector J2.
11. Adjust the WFS knob until the motor measures 51
± 5.5 ipm. (9.5 ± 1.0 rpm).
12. Remove the shorting plug.
13. Adjust the WFS knob to maximum.
14. Insert the shorting plug into connector J2.
15. Adjust the WFS until the motor measures 793 ±
5.5 ipm (146.7 ± 1.0 rpm.)
16. Remove the shorting plug.
17. Release the gun trigger.
(For Codes above 11290 use 18)
18. Replace P2 from the harness into connector J2.
19. Turn off power.
20. Secure the wraparound to the LF-72 with 5
screws.
To calibrate the LF-72 for Codes 11606 thru 11609:
1. Turn off power to the LF-72 and welding power
source.
2. Disconnect the electrode lead from the feed plate
and from the welding power source.
3. Remove the wraparound from the LF-72, See
Figure D.1.
4. Set WFS Knob to 50 IPM and trigger the machine.
5. Measure drive role RPM. If reading is 8.9 to 9.2
RPM proceed to step 6 otherwise insert the short-
ing plug into the control p.c. board J2 (shorts pins 1
and 5.) See Figure D.2 and adjust WFS Knob to get
9.05 +/- 0.15 RPM and then remove shorting plug.
LF-72
FIGURE D.1
FIGURE D.2
J2 CONNECTOR
6. Set WFS Knob to 300 IPM.
7. Measure drive role RPM. If reading is 54.8 to 56.0
RPM proceed to step 8 otherwise insert the short-
ing plug into the control p.c. board J2 (shorts pins
1 and 5.) See Figure D.2 and adjust WFS Knob to
get 55.4 +/- 0.6 RPM and then remove the shorting
plug.
8. Set WFS Knob to 800 IPM.
9. Measure drive role RPM. If reading is 146.4 to
148.4 RPM calibration is complete otherwise insert
the shorting plug into the control p.c. board J2.
(shorts pins 1 and 5.) See Figure D.2 and adjust
WFS Knob to get 147.4 +/- 1.0 RPM and then
r e m o v e t h e s h o r t i n g p l u g . R e l e a s e t h e G u n
Trigger, connect J2 of the harness to p.c. board.