Lincoln Electric IM422 PRO-CUT 40 - Manual (Page 24)

Components must have proper torque applied to
mounting screws and to electrical terminals. Torque
the modules according to the following:
COMPONENT TO HEAT SINK TERMINAL
COMPONENT TORQUE ± 10% TORQUE ± 10%
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A1, A2
44 Inch-Lbs.* N.A.
(M16100-1, -2)
Input Diode 6 Inch-Lbs. ** 26 Inch-Lbs.
(M15454-1)
Output diode 25 Inch-Lbs. N.A.
(M15482-3)
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* Re-torque after 3 hours to allow for spread of compound.
** Tighten in staggered fashion one quarter turn at a time.
Environmental Protection
High voltage connections are covered with an RTV
sealant to prevent malfunction in severe environ-
ments. Sealant must be applied to connections which
have been opened or otherwise lost their protection.
A noncorrosive electronic grade sealant such as Dow
Corning 3140, 3145, 738, Columbus Adhesives 0172
or GE RTV-162 is recommended. Sealant may also
be purchased from Lincoln Electric (order E2519
Silicone Rubber RTV coating). Apply sealant after the
machine is repaired and tested.
High voltage areas which require sealant are listed:
- PC boards requiring protection are supplied
from Lincoln Electric with required protection.
- Input rectifier D9, all 5 terminals.
- Output rectifiers, D1 and D2.
The Power Switch requires tape over connection
areas and contact openings to minimize dirt build up.
– 24 –
PRO-CUT 40 STATUS LIGHTS OPERATING MODES:
STATUS LIGHTS CONDITION SUGGESTIONS
MACHINE ON Should always be on when machine is on. Normal
OUTPUT ON On when there is voltage potential at the torch (cutting or pilot) Normal .
OUTPUT ON is blinking alternately with AIR PRESSURE when There is a problem with the microprocessor,
power is first applied to machine. replace the control PC board.
OUTPUT ON is blinking alternately with MALFUNCTION. Wait for machine to cool.
AIR PRESSURE On whenever the air pressure is above 60 psi (413 kPa), there Normal conditions are purge, preflow, postflow and
is an error condition mentioned above where air will turn on. cutting.
THERMAL Should normally be off. If on, wait for machine to cool down.
MALFUNCTION Light on. At end of preflow, machine checks to see if the torch Check consumables, replace as needed. Check torch
is shorted. cable to see if it is punctured or cut.
Light blinking. If cutting tried with air pressure less than 60 psi No air connecter to machine, air pressure set too low,
(413 kPa), the machine will wait for air pressure to become or air leak in system.
greater than 60 psi (413 kPa).
Light blinking alternately with OUTPUT ON. Pilot arc duty cycle has been exceeded. Wait for
machine lights to stop blinking.
Light turned on during cutting. There is an overcurrent If cutting with standoff more than 1/8” at high range
condition caused by a surge of current the machine was not of machine and nozzle is accidentally touched
designed to handle. Release the trigger and resume cutting. to work, shorten stickout, or use drag cup.
Check consumables to see if electrode is melted to
nozzle.
Light blinking with THERMAL light on. Wait for machine to cool.