Tweco 3000 Merlin - Manual (Page 46)

SERVICE 5-2 Manual 0-2532
D. Coolant Level and Conductivity
1. Coolant Level
The coolant level should be checked every day at
the rear panel coolant gauge. If the coolant in the
reservoir is more than 2 inches (50mm) from the
top of the reservoir then add Torch Coolant.
2. Coolant Conductivity
The coolant conductivity LED on the front panel
must be ON for normal operation. If the LED is
OFF then drain the old coolant from the Power
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 reser-
voir as follows:
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
recommended procedures.
Coolant Hose
Coolant Hose
Connection
A-01017
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