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E-5
THEORY OF OPERATION
LN-10
E-5
WIRE FEED OVERLOAD
PROTECTION
The LN-10 has solid-state overload protection of the
wire drive motor. If the wire drive motor becomes
overloaded for an extended period of time, the protec-
tion circuitry turns off the power source, wire feed and
gas solenoid, and then displays “H30” on the WFS
display (with blank voltage display). This indicates the
wire drive motor is overloaded and will remain shut
down for about 30 seconds before the unit will auto-
matically reset. The “H30” display decrements every
seconds until it reaches “HOO”. At that time, the unit
resets automatically and the previous displays will
return indicating the unit is ready to operate again.
Overloads can result from improper tip size, liner,
drive rolls, guide tubes, obstructions or bends in the
gun cable, feeding wire that is larger than the rated
capacity of the feeder or any other factors that would
impede normal wire feeding. (See “Avoiding Wire
Feeding Problems” in the MAINTENANCE section).
GROUNDING LEAD PROTECTOR
The frame of the LN-10 control is grounded to the
frame of the power source by a lead in the control
cable. An overload protector prevents welding current
from damaging this lead if the electrode circuit touch-
es the wire feeder frame while the electrode is electri-
cally hot.
If such a grounding lead fault occurs, the WFS display
will show “GLP”, (with blank voltage display) and the
trigger circuit will be disabled. To reset the circuit
release the trigger, make sure that the electrode is not
touching the wire feeder frame, and then either press
any key on the keypad or close the trigger. When the
GLP circuit is reset, the “GLP” display is removed and
the wire feeder is returned to normal operating mode.
LOSS OF VOLTAGE SENSE
SHUTDOWN
If the actual displayed voltage when the trigger is
closed, drops below 8.0 volts for over 0.8 second it is
assumed the voltage feed back sensing circuit to the
LN-10 is opened or faulty. Loss of Voltage Sense
Shutdown occurs until the trigger is released.
This shutdown stops the motor, shuts off the gas flow
and disables the power source output to prevent the
LN-10 voltage control from driving the power source
output too high due to loss of proper feedback sensing
via #21 (WORK) and #67 (ELECTRODE) sensing
leads.
PROTECTION AND SHUTDOWN
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