Lincoln Electric MINIFLEX IM857 Operator's Manual page 17

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Motor does not start.
Motor stops automatically.
Poor suction.
Unit will not sense current.
Unit automatically cycles between
low and high speeds.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
TROUBLESHOOTING
POSSIBLE
CAUSE
1. Ensure 115 VAC input power is
available.
2. Circuit breaker tripped. Reset cir-
cuit breaker (See Electrical
.
Maintenance)
3. Carbon brushes worn. Check
brushes, replace if necessary.
1. Thermal protection is activated.
Check that the cooling underneath
the top cover and/or the outlet are
not obstructed.
1. Leakage. Check hose connections,
hose integrity.
2. Filter dirty. Replace both LongLife-
H™ Filter and HEPA filter.
3. Pre-filter dirty. Check pre-filter and
replace or clean using an industrial
vacuum cleaner. Use caution and
proper personal protection equip-
ment when cleaning pre-filter.
4. Improper application. Check hose
diameter and maximum length 24
ft. (7.5 m), check filter for oily con-
ditions.
5. Brushes worn in one of the motors.
Replace brushes in both motors.
1. Welding current too low. Loop
cable two or three times on current
sensor.
2. Current sensor or PC board dam-
aged. Replace sensor or PC
board.
1. Check connections from PC board
to motors.
2. Control panel/PC board damaged.
Replace control panel and PC
board.
CAUTION
MINIFLEX
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field
Facility.
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Service