Miller Electric KC237900 User Manual
Page 12
OM-530 Page 8
to proper output terminals on welding power source;
ensure that proper polarity is maintained.
ELECTRIC SHOCK can kill.
•
Secure and insulate with sleeving any ex-
posed cable connections to prevent contact with
personnel, equipment, etc.
12. If an Electroslope and/or Pulser is to be installed,
see Section 3-5 and/or 3-6, and install the desired
units at this point.
13. Reinstall cover onto TIG-Unit and connect the nec-
essary associated equipment (shielding gas, water,
etc.).
3-8. FIELD INSTALLATION OF OPTIONAL PRE-
FLOW TIMER
WARNING: ELECTRIC SHOCK can kill.
•
Do not touch live electrical parts.
•
Shut down welding power source, and dis-
connect input power employing lockout/tagging
procedure before beginning this installation.
Lockout/tagging procedures consist of pad-
locking line disconnect switch in open position,
removing fuses from fuse box, or shutting off
and red-tagging circuit breaker or other discon-
necting device.
IMPORTANT: All directions, such as left or
right, are with respect to the operator facing the
welding power source front panel. Retain all
hardware removed during this procedure for re-
installation.
A. Mechanical Installation (Figure 3-3)
1.
Remove TIG-Unit top cover and left side panel.
CAUTION: METAL FILINGS AND/OR TOOL
CONTACT WITH INTERNAL COMPONENTS
can damage unit.
•
Cover internal components.
•
Clean unit, and remove internal covering ma-
terial before resuming operation.
2.
Mount Preflow ON/OFF switch S200 in the 1/2 in.
(12.7 mm) diameter hole using supplied hardware.
3.
Mount Preflow Time control with attached printed
circuit card assembly TD2 in the 3/8 in. (9.5 mm) di-
ameter hole using supplied hardware.
4.
Affix supplied PREFLOW TIME label to front panel
over both controls.
5.
Attach supplied knob to Preflow Time control shaft.
B. Electrical Installation (Figure 3-2)
IMPORTANT: Before preceeding with this installation
familiarize yourself with the circuit diagram provided in
this manual.
For All Models:
1.
Remove and discard jumper lead 70 from terminal
70 on terminal strip 1T and terminal 73 on terminal
strip 2T.
2.
Connect new lead 70 from the preflow timer assem-
bly to terminal 70 on 1T.
3.
Connect lead 73 from preflow timer assembly to ter-
minal 73 on 2T.
4.
Connect lead 33 from preflow timer assembly to ter-
minal 33 on 1T.
5.
For Models With Electroslope:
a.
Disconnect lead 6 from electroslope edge con-
nector pin X. Tape and tie off lead 6.
b.
Insert new lead 92 into pin X where lead 6 was
removed in Step a.
c.
Connect new lead 6 from preflow timer assem-
bly to terminal 6 on 1T.
6.
For Models Without Electroslope: Tape and tie off
leads 6 and 92.
7.
For Models Effective With Serial No. JA373511:
a.
Remove jumper link 6 from terminals 58 and 59
on terminal strip 1T
b.
Connect lead 32 from preflow timer assembly to
terminal 32 on 1T.
c.
Connect new lead 30 from preflow timer as-
sembly to terminal 30 on 2T.
d.
Connect lead 37 from preflow timer assembly to
terminal 37 on 2T.
e.
Connect lead 59 from preflow timer assembly to
terminal 59 on 1T.