Valley FABRICATOR 251 Service Manual - Service Manual
August 22, 2008
7-3
SERVICE MANUAL
FABRICATOR 251
7.04 Logic and Control Tests
A. Depress Gun Switch and observe the following:
1. Gas flows
2. Contactor energizes
3. Feed Roll Turns
4. Display reads approx "15.0 V"
B. Release Gun Switch
1. Gas flow stops
2. Contactor de-energizes
3. Feed Roll stops
4. Display reads "00.0V"
C. Set WELD MODE SELECTOR SWITCH to position "4T".
Depress Gun Switch and observe the following:
1. Gas flows
2. Contactor energizes
3. Feed Roll Turns
4. Display reads approx "15.0 V"
D. Release GUN switch
1. Gas continues to flow
2 Contactor remains energized
3. Feed roll continues to turn
4. Display reads approx "15.0 V"
E. Depress Gun Switch
1. Gas flow stops
2. Contactor de-energizes
3. Feed Roll stops
4. Display reads approx "0.0 V"
F. Set WELD MODE SELECTOR SWITCH to position "2T".
Set BURNBACK CONTROL potentiometer to maximum
position. Depress Gun Switch and observe the
following:
1. Gas flows
2. Contactor energizes
3. Feed roll turns
4. Display reads approx "15.0 V"
G. Release Gun Switch
1. Feed Roll stops immediately
2. Display reads "15.0 V"
2. After 1 ½ seconds
a. Gas flow stops
b. Contactor de-energizes
c. Display reads "0.0 V"
H. Set BURNBACK CONTROL potentiometer to minimum.
Set MODE SELECTOR SWITCH to SPOT position
1. Depress Gun Switch
a. Gas Flows
b. Contactor energizes
c. Feed Roll turns
d. Display reads "15.0 V"
e. After .5 seconds
1. Gas flow stops
2. Contactor de-energizes
3. Feed Roll stops
4. Display reads "0.0 V"
I. Set WELD (SPOT/STITCH) TIMER CONTROL to
Maximum position (4)
1. Depress Gun Switch
a. Gas flows
b. Contactor energizes
c. Feed roll turns
d. Display reads "15.0 V"
e. After 12 seconds
1. Gas flow stops
2. Contactor de-energizes
3. Drive roll stops
4. Display reads "0.0 V"