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20
TROUBLE SHOOTING - KUPJR105
WARNING
There are extremely dangerous voltage and power levels present inside this unit.
Do not attempt to diagnose or repair unit by removing external cover unless you are an authorised repair
agent for UNIMIG.
A. The cutting torch fails to ignite the arc, when torch trigger is pressed.
1. Gas pressure too high or too low, check and adjust gas pressure to 5-6bar/70-87psi.
2. The shield cup is not installed correctly, turn off the power source, install and screw it down properly, then turn
on the power source.
3. The electrode, swirl ring or cutting tip is not installed correctly, turn off the power source, install the electrode,
swirl ring or cutting tip correctly, and screw shield cup down properly, then turn on the power source.
B. The cutting torch fails to ignite the arc, when torch trigger is pressed the temperature lamp is on.
1. Power Supply is overheated (OC/OT lamp on), let unit cool down for at least 5 minutes. Make sure the unit
has not been operated beyond Duty Cycle limit. Refer to page 8 for duty cycle specifications.
2. Faulty components in unit return for repair.
C. No cutting output; Torch activated, power source on; Gas flows; Fan operates
1. Torch not properly connected to power supply, check that torch leads are properly connected to power supply.
2. Work cable not connected to work piece, or connection is poor, make sure that work cable has a proper
connection to a clean, dry area of the work piece.
3. Faulty components in unit return for repair
4. Faulty Torch, return for repair
D. Low cutting output
1. Incorrect setting of CURRENT (A) control, check and adjust to proper setting.
2. Faulty components in unit, return for repair.
E. Difficult Starting
1. Worn torch parts (consumables), shut off input power. Remove and inspect torch shield cup, cutting tip, swirl
ring and electrode. Replace electrode, cutting tip or swirl ring if worn; replace shield cup if excessive spatter
has adhered to it.
F. Arc shuts off during operation; arc will not restart when torch switch is activated.
1. Power Supply is overheated (OC/OT lamp on), let unit cool down for at least 5 minutes. Make sure the unit
has not been operated beyond Duty Cycle limit. Refer to Section 2 for duty cycle specifications.
2 Torch consumables worn, check torch shield cup, swirl ring, cutting tip and electrode; replace as needed.
3. Faulty components in unit return for repair.
G. No gas flow; the power is lamp on; Fan operates
1. Gas not connected or pressure is too low, check gas connections. Adjust gas pressure to proper setting.
2. Faulty components in unit return for repair.
H. Torch cuts but low quality
1. Current (A) control set too low, increase current setting.
2. Torch is being moved too fast across work piece, reduce cutting speed.
3. Excessive oil or moisture in torch, hold torch 1/8 inch (3 mm) from clean surface while purging and
observe oil or moisture buildup (do not activate torch). If there are contaminants in the air, additional filtering
may be needed. Refer to sub-micronic air filter page 8.
Page 21
Instruction Manual for CUT105 (C427)
19/12/2014
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