ESAB LAF 1251 BR Manual Del Usuario Y Repuestos página 30

Any total length (which should be the smallets possible) and any welding current
used, the work clamp cable part should correspond to the maximum current of the
LAF 1251 BR used to supply the duty cycle of
The thermal welding circuit causes a drop in the voltage which added to the internal
natural drop in the power source itself, reducing the voltage arc and the maximum
current available making the arc unstable.
4.8 Connection of welding devices used in the welding process
To interconnect the Power Source LAF 1251 BR to the wire feeder heads , Tractors for
submerged arc or other devices used for welding, refer to Instruction Manual of each
equipment to be connected and, if necessary, make changes in the connections to
correctly operate the command of LAF 1251 BR, before starting the operation. In case
of doubts contact ESAB Technical Assistance Department (refer to last page of this
manual) or an ESAB Authorised Service.
4.9 Connections
a) On delivery the rectifier is connected
to 440 V.
b) For other supply voltages:
Remove the left side plate.
Commute the main transformer and the
auxiliary transformerl as instructed in
section 4.5.
c) Select the network cable and
connect it to the main switch or circuit
breaker, according to local regulations
(see table 4.1).
d) Remove the front plate (2 units).
e) Connect the ground wire to the screw
marked .
f) Connect the network cables to the
insulators L1, L2 and L3 (5).
g) Tighten the strain reliefs (1).
h) Connect the control cable between
the rectifier and the outlet control box of
28 poles (2) inside the rectifier.
i) Connect the measuring cable (4) (1
pole) to measure the arc voltage to
return cable / welding head.
j) Connect the welding cables to the
contacts (3) marked + and - in front of
the rectifier.
l) Assemble the plates side / front.
10 0%.
5
1
-
3
- 30 -
2
+
4