Tweco A80-A120 CutMaster - Manual (Page 74)

CUTMASTER A80, A120
SERVICE Manual 0-5119
5-2
5.03 Common Faults
Problem - Symptom Common Cause
Insufficient
Penetration
1. Cutting speed too fast.
2. Torch tilted too much.
3. Metal too thick.
4. Worn torch parts
5. Cutting current too low.
6. Non - Genuine Thermal
Dynamics parts used
7. Incorrect gas pressure
Main Arc
Extinguishes
1. Cutting speed too slow.
2. Torch standoff too high from
workpiece.
3. Cutting current too high.
4. Work cable disconnected.
5. Worn torch parts.
6. Non - Genuine Thermal
Dynamics parts used
Excessive Dross
Formation
1. Cutting speed too slow.
2. Torch standoff too high from
workpiece.
3. Worn torch parts.
4. Improper cutting current.
5. Non - Genuine Thermal
Dynamics parts used
6. Incorrect gas pressure
Short Torch
Parts Life
1. Oil or moisture in air source.
2. Exceeding system capability
(material too thick).
3. Excessive pilot arc time
4. Gas pressure too low.
5. Improperly assembled torch.
6. Non - Genuine Thermal
Dynamics parts used
Difficult Starting 1. Worn torch parts.
2. Non - Genuine Thermal
Dynamics parts used.
3. Incorrect gas pressure.
5.02 Maintenance Schedule
NOTE
The actual frequency of maintenance may need
to be adjusted according to the operating envi-
ronment.
Daily Operational Checks or Every Six
Cutting Hours:
1. Check torch consumable parts, replace if dam-
aged or worn.
2. Check plasma and secondary supply and pres-
sure/flow.
3. Purge plasma gas line to remove any moisture
build-up.
Weekly or Every 30 Cutting Hours:
1. Check fan for proper operation and adequate
air flow.
2. Inspect torch for any cracks or exposed wires,
replace if necessary.
3. Inspect input power cable for damage or ex-
posed wires, replace if necessary.
Six Months or Every 720 Cutting Hours:
1. Check the in-line air filter(s), clean or replace
as required
2. Check cables and hoses for leaks or cracks,
replace if necessary.
3. Check all contactor points for severe arcing or
pits, replace if necessary.
4. Vacuum dust and dirt out of the entire machine.
CAUTION
Do not blow air into the power supply during
cleaning. Blowing air into the unit can cause
metal particles to interfere with sensitive electri-
cal components and cause damage to the unit.