Lincoln Electric IM857 MINIFLEX K3972-1 & K3973-1 - Manual (Page 15)

15
TROUBLESHOOTING MINIFLEX ® PORTABLE WELDING FUME EXTRACTOR
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Lincoln Authorized Service Facility for technical troubleshooting assistance before you proceed.
WWW.LINCOLNELECTRIC.COM/LOCATOR
Service and Repair should only be performed by Lincoln Electric Factory Trained Personnel. Unauthorized repairs performed on
this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your
safety and to avoid ELECTRICAL SHOCK, please observe all safety notes and precautions detailed throughout this manual.
PROBLEMS / SYMPTOM(S) POSSIBLE CAUSE(S) RECOMMENDED COURSE(S) OF ACTION
MOTOR DOES NOT START. Ensure 115 VAC (K3972-1) or
230 VAC (K3973-1) input power
is available. Verify 115 VAC/60Hz, 1ph (K3972-1) or 230 VAC/60Hz, 1ph
(K3973-1) input power at the machine.
Circuit breaker tripped. Reset circuit breaker.
Carbon brushes worn. Check brushes, replace if necessary.
MOTOR STOPS
AUTOMATICALLY
Thermal protection is activated. Check that the cooling underneath the top cover and/or the outlet
are not obstructed.
POOR SUCTION. Leakage. Check hose connections and integrity.
Filter dirty. Replace both LongLife-H Filter and HEPA filter.
Pre-filter dirty. Check pre-filter and replace or clean using an industrial vacuum
cleaner. Use caution and proper personal protection equipment
when cleaning pre-filter.
Improper application. Check hose diameter and maximum length 24 ft. (7.5 m), check
filter for oily conditions.
Brushes worn in one of the
motors. Contact your local Lincoln Authorized Field Service Facility.
UNIT WILL NOT SENSE
CURRENT.
Welding current too low. Loop cable two or three times on current sensor.
Current sensor or PC board
damaged. Replace sensor or PC board.
UNIT AUTOMATICALLY CYCLES
BETWEEN LOW AND HIGH
SPEEDS.
Loose connections. Check connections from PC board to motors.
Control panel/PC board
damaged. Replace control panel and PC board.
TROUBLESHOOTING GUIDE