Trouble Shooting Guide - LOTOS LTP5000D User Manual

The following trouble shooting guide is for your reference only. Lotos Technology will NOT take any
liability or responsibility for any injury or damage caused in such action(s). Always turn off electrical
power and air supply before performing inspection and reconnection.
CAUTIONS: Only qualified technicians are authorized to undertake the repair of this equipment in the
case of machine failure.
Faults
1. The power pilot light is off,
the fan doesn't work, and
there is no cutting voltage
output.
2. The power switch is on,
the fan doesn't work. No
voltage is indicated on the
front panel.
3. The fan is on, the
abnormal pilot light is not
on, cannot start the arc.
4. The abnormal pilot light is
off, no cutting voltage
output.
5. The problem pilot light is
not on.
6. The abnormal pilot light is
on.
7. The output current is not
stable.
8. The machine does not cut
metal properly, or the arc is
not stable.
Possible Causes/Solutions
1. The power switch is broken.
2. There is no electrical power.
3. The input cable is short-circuited.
1. There is an improper connection to the plug or the plug is improperly
connected to the 380V power supply, causing over-voltage protection. For
latter case, wait for 8 minutes, reconnect to 220V power supply, and restart
the machine.
2. The transformer is broken.
3. Voltage deficiency protection has been activated.
4. The wire from the switch to the bottom board has loosened. Tighten it.
5. The relay on the bottom board is damaged. Replace with a new relay.
Contact the manufacturer or certified service personnel.
1. The welding cable is broken.
2. The ground is improperly connected to the work piece.
3. The "+" output terminal is not properly connected.
1. The nozzle is oxidized or too far away. Remove the oxidization on
the surface, or shorten the distance to 1 mm.
2. Otherwise, contact the manufacturer or certified service personnel.
1. Over-current protection may have initialized. Either wait for 2 or
3 minutes for the problem to go away or turn off the power, wait until
the abnormal pilot light is off, and restart (machine will recover
automatically).
2. Otherwise, contact the manufacturer or certified service personnel.
1. Check connections on the front panel.
2. Otherwise, contact the manufacturer or certified service personnel.
1. The input voltage is too low.
2. The ground cable is not well-connected.
3. The air pressure is too high or too low.
4. The nozzle and electrode of the torch do not fit well, or the input
current is too low.
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