Valley FABRICATOR 251, Service Manual

Page: 36 / 104

3-14 August 22, 2008
FABRICATOR 251 SERVICE MANUAL
3.16 Polarity Changeover
WARNING
ELECTRIC SHOCK CAN KILL! Make ce r tain the input powe r is disconnected f r om the powe r supply befo r e
p r oceeding. Do not r eattach the input powe r until told to do so in these inst r uctions.
The output te r minals a r e located on the f r ont panel of the welding powe r sou r ce.
CABLE TO GUN, CABLE TO WORK
CABLE TO GUN CABLE TO WORK
1. GMAW* – Steel, Stainless Steel,
Aluminum & gas shielded Flux
Co
r ed elect r ode wi r es
1. D.C. Elect r ode Positive
(DCEP) – Reve r se Pola r ity
1. Connected to (+)
Pos. output
te
r minal
1. Connected to (-)
Neg. output
te
r minal
2. FCAW* – Gasless Flux Co r ed
elect r ode wi r e
2. D.C. Elect r ode Negative
(DCEN) – St r aight Pola r ity
2. Connected to (-)
Neg. output
te
r minal
2. Connected to (+)
Pos. output
te
r minal
CABLE CONNECTIONS
PROCESS POLARITY
* Exception - Contact you r fille r metal supplie r fo r the r ecommended pola r ity.
Table 3-3: P r ocess Cable Connections
Work Lead
Art # A-07163
Co nn ected for D.C.
Electrode Po s itive
(DCEP) Weldi n g
Figu r e 3-14: Pola r ity Connections fo r DCEP