LOKERMANN GRAND TIG 250 DC PULSE, Руководство пользователя

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4.2
Troublesho-
oting
� Before the welding machines are dispatched from the factory, they have already been
tested and calibrated accurately. It is forbidden for anyone who is not authorized by our
company to do any change to the equipment!
� Maintenance course must be operated carefully. If any wire becomes flexible or is misplaced,
it maybe potential danger to user!
� Only professional maintenance staff that isauthorized by our company could overhaul the
machine!
� Be sure to shut off the Main Input Power before doing any repair work on the welding machine!
� If there is any problem and there is no authorized professional maintenance personal on site,
please contact local agent or the distributor!
If there are some simple troubles with the welding machine, you can consult the following chart:
S/N Troubles Reasons Solution
1
Turn on the power source, and the power
lamp is on, but fan doesn’t work
There is something in the fan Clear out
The start capacitor of fan damaged Change capacitor
The fan motor damaged Change fan
2 The number on the display is not intact. The LED in the display is broken Change the LED
3
The max and min value displayed
doesn’t accord with the set value.
The max value is not accordant
Adjust potentiometer Imax on the
control board.
The min value is not accordant
Adjust potentiometer Imin the current
meter.
4 No no-load voltage output The machine is damaged Check the main circuit and the Pr4.
5
Arc can not be
ignited (TIG)
There is spark on the
HF igniting board.
The welding cable is not connected
with the two output of the welder.
Connect the welding cable to the
welder’s output.
The welding cable damaged. Repair or change it.
The earth cable connected unstably. Check the earth cable.
The welding cable is too long. Use an appropriate welding cable.
There is oil or dust on the workpiece. Check and remove it.
The distance between tungsten
electrode and workpiece is too long. Reduce the distance (about 3mm).
There is not spark on
the HF igniting board.
The HF igniting board does not work. Repair or change Pr8
The distance between the discharger is
too short.
Adjust this distance (about 0.7mm).
The malfunction of the welding gun
switch.
Check the welding gun switch, control
cable and aero socket.
6 No gas flow (TIG)
Gas cylinder is close or gas pressure is
low
Open or change the gas cylinder
Something in the valve Remove it
Electromagnetic valve is damaged Change it
7
Gas always flows
The gas-test on the front panel is on The gas-test on the front panel is off
Something in the valve Remove it
Electromagnetic valve is damaged Change it
The adjustment knob of pre-gas time
on the front panel is damaged
Repair or change it
8 The welding current can not be adjusted
The welding current potentiometer on
the front panel connection is not good
or damaged
Repair or change the potentiometer
9
The welding current displayed isn’t
accordant with the actual value.
The min value displayed isn’t
accordant with the actual value.
Adjust potentiometer Imin on the
power board.
The max value displayed isn’t
accordant with the actual value.
Adjust potentiometer Imax on the
power board.
10
The penetration of molten pool is not
enough.
The welding current is adjusted too
low
Increase the welding current
11 The alarm lamp on the front panel is on Over heat
protection
Two much welding
current
Reduce the welding current output
Working time too
long
Reduce the duty cycle (work
intermittently)