Tweco 6000 CE Merlin - Manual (Page 50)

CUSTOMER/OPERATOR SERVICE 5-2 Manual 0-2601
Supply and torch leads and replace with new cool-
ant. Check the condition of the deionizer bag in
the reservoir basket, if the bag is yellowish brown
(straw color) replace the bag.
E. Draining Coolant
Remove the old coolant from the Power Supply reservoir
per the following procedure:
1. Remove the right side and top panels from the
Power Supply.
2. Disconnect the coolant hose input to the rear panel
filter assembly.
3. Carefully lower the hose out the right side of the
Power Supply and drain the coolant into an ac-
ceptable container.
CAUTION
Handle and dispose of the used coolant per recom-
mended procedures.
Coolant Hose
Coolant Hose
Connection
A-01511
Figure 5-2 Draining Coolant From Reservoir
4. Reconnect the hose to the filter assembly.
5. Install new coolant and deionizer bag.
6. Reinstall the top and right side panels.
5.03 Common Operating Faults
Listed below are common cutting problems followed by
probable causes of each. If the problems are caused by a
torch problem, refer to the appropriate Torch Manual.
1. Insufficient Penetration
a. Cutting speed too high
b. Current too low
c. Metal too thick
d. Worn or damaged torch parts
2. Main Arc Extinguishes
a. Cutting speed too low
b. Standoff too high
3. Dross Formation
a. Improper gas pressure
b. Improper cutting speed
c. Worn or damaged torch parts.
4. Burned-Out Tips
a. Cutting current too high
b. Damaged or loose cutting tip
c. Tip in contact with work
d. Heavy spatter
e. Low plasma gas pressure
5. Poor Pilot Starting
a. High coolant conductivity
5.04 Troubleshooting
General
Troubleshooting and repairing the this unit is a process
which should be undertaken only by those familiar with
high voltage high power electronic equipment.
WARNING
There are extremely dangerous voltage and power
levels present inside this unit. Do not attempt to
diagnose or repair unless you have had training in
power electronics measurement and troubleshoot-
ing techniques.