Tweco PAK 44G - Manual (Page 30)

CUSTOMER/OPERATOR SERVICE 24 Manual 0-2686
add Torch Coolant. If the coolant gets too low, 40
psi (2.76 bar) or lower, the coolant interlock will
open.
2. Coolant Conductivity
The reservoir contains a cap/cartridge assembly
which includes a small cartridge of deionizing
resin to maintain the resistivity of the coolant.
Check the condition of the deionizer cartridge in
the reservoir basket. If the cartridge has changed
from a gray color to yellowish brown (straw color)
then drain the old coolant from the Power Supply
and torch leads. Replace with new coolant and
deionizer cartridge.
The coolant filter located on the pump/fan assembly has
a reusable screen that should be removed and cleaned
once every six months or at any time the coolant pres-
sure drops.
C. Draining Coolant
The easiest way to drain the coolant from the reservoir is
to pump it out through the filler tube. Using an external
pump and hose, pump the coolant into an acceptable con-
tainer.
If an external pump is not available then remove the old
coolant from the Power Supply reservoir per the follow-
ing procedure:
1. Remove the Top Enclosure from the Power Supply.
2. Locate the coolant hose connected to the bottom of
the coolant reservoir.
3. Disconnect this coolant hose at it's lowest point
being careful not to lose the coolant out of the end
of the hose.
4. Carefully move the end of the hose out the side of
the Power Supply and drain the coolant into an
acceptable container.
CAUTION
Handle and dispose of the used coolant per recom-
mended procedures.
5. Reconnect the coolant hose.
6. Disconnect the Torch Leads from the Power Sup-
ply.
7. Remove the coolant from the leads using clean,
dry, compressed air.
8. Reconnect the leads to the Power Supply.
9. Install new coolant and deionizer cartridge.
10. Reinstall the Top Enclosure on the Power Supply.
5.03 Common Operating Faults
The following lists the more common cutting faults and
what is the possible cause:
1. Insufficient Penetration
a. Gouging speed too fast
b. Torch angle incorrect
c. Metal too thick
d. Worn torch parts
e. Gouging current too low
f. Non-Genuine Thermal Dynamics Parts
2. Main Arc Extinguishes
a. Gouging speed too slow
b. Torch standoff too high from workpiece
c. Work cable disconnected
d. Worn torch parts
e. Non-Genuine Thermal Dynamics Parts
3. Excessive Dross Formation
a. Improper gas pressure or mixture
b. Gouging speed too slow
c. Torch standoff too high from workpiece
d. Worn torch parts
e. Improper gouging current
f. Non-Genuine Thermal Dynamics Parts
4. Short Torch Parts Life
a. Oil or moisture in air source
b. Exceeding system capability (material too thick)
c. Excessive pilot arc time
d. Gas flow too low (incorrect pressure)
e. Improperly assembled torch
f. Output current too high
g. Torch tip contacting workpiece
h. Damaged or loose torch head components
i. Non-Genuine Thermal Dynamics Parts
5. Poor Pilot Starting
a. Non-Genuine Thermal Dynamics Parts