Tweco Merlin 6000GST Master PS - Manual (Page 50)

CUSTOMER/OPERATOR SERVICE 5-2 Manual 0-2652
ant. Check the condition of the deionizer bag in
the reservoir basket, if the bag is yellowish brown
(straw color) replace the bag (see NOTE).
NOTE
To accurately measure the coolant conductivity it
is recommended to use a Conductivity Sensor simi-
lar to Thermal Dynamics Model TDS-73 (Catalog
# 7-2844).
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-01831
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 fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
e. Cutting current too low
f. Non-Genuine Thermal Dynamics Parts
2. Main Arc Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Cutting current too high
d. Work cable disconnected
e. Worn torch parts
f. Non-Genuine Thermal Dynamics Parts
3. Excessive Dross Formation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
d. Improper cutting current
e. Non-Genuine Thermal Dynamics Parts
4. Short Torch Parts Life
a. Oil or moisture in gas source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Starting or finishing off the workpiece
e. Gas flow too low (incorrect pressure or flow setting)
f. Improperly assembled torch
g. Output current too high
h. Torch tip contacting workpiece
i. Damaged or loose torch head components
j. Voltage ramping not set (refer to Section 4.06-F)
k. Non-Genuine Thermal Dynamics Parts