INSTALLATION & OPERATING INSTRUCTIONS
SPOT/BURNBACK/TRIGGER LATCH KIT
P/N 36694
For MIGMASTER 251 PACKAGE
F-15-359
June, 1998
This optional 3-function module permits using the
Migmaster 251 for spot welding, burnback control to
keep wire from sticking at end of weld, and trigger latching for long weld runs.
Before installing this kit, make sure all primary input power to the power source is disconnected and/
or lock out procedures are in place.
INSTALLATION
1. Remove and discard the upper blank plate from
the control panel of the Migmaster 251 unit. Retain the 4 mounting screws.
2. Remove the top hinged cover and left side panel
from the Migmaster 251 unit and set them aside.
3. Feed the control wires and the U-shape current
detector assembly of the Spot/Burnback module
through the rectangular hole in the control panel,
and then mount the module using the 4 mounting
screws retained from step 1.
4. Route the control wires through the hole marked
1 in the wire feeder compartment and above the
output studs. Restrain them with cable ties.
5. Remove the jumper plug from the upper right receptacle on the units main control PC board, and
then connect the control wires from the Spot/
Burnback module to this receptacle.
NOTE: Do not discard the jumper plug. If it becomes
necessary to remove the optional module, the
jumper must be reconnected for proper operation.
6. Locate trim potentiometer R25 near the top center
edge of the main control PC board. This potentiometer is set at a minimum position at the factory
and will not require any adjustments. However, to
adjust burnback time, using a small screwdriver,
rotate R25 trimpot carefully to get a desired
burnback time.
7. Mount the current detector to the work cable near
the negative (-) stud in the wire feeder compartment. To do this, remove nut and reed switch from
the U shape steel piece. Slip the U shape piece
over the cable and then reassemble reed switch
and nut. Tighten nut until snug. Do not overtighten.
8. Reinstall the left side panel and then the top hinged
cover.
OPERATION
Spot Welding
1. Set the Spot/Std/Trigger Latch to SPOT position.
2. Set the Spot timer dial to the desired setting (0.1 to
5.0 seconds).
3. Use a No. 12 Spot Weld nozzle on your torch .
4. Trim welding wire back so that the end is slightly
inside the nozzle.
Be sure this information reaches the operator.
You can get extra copies through your supplier.
Install
Spot Module
here.
Hole 1
Install
Current Detector
Torch
Cable
Figure 1 - Migmaster 251, Feeder Compartment (Right Side View)
Work
Cable
Main Control
PC Board
R25 trimpot (set to min.)
Connect control wires
from Spot Module here.
Hole 1
(Ref.)
Figure 2 - Migmaster 251, Left Side View
2
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