4
Connection and installation
Page 26
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
4.4 Earth cable connection
The weld current return goes through the earth cable, which must be connected to
the ALPHA 850 welding device as follows:
Connecting the earth cable plug:
The earth cable’s plug must be connected to the socket
marked X21.
The connection must be secured by a strong turn rightward.
Earth cables and earth clamps are not delivered with the ALPHA 850.
Warning:
•
The earth cable connection cannot be locked! The connection
must be tested regularly for tightness!
•
To prevent inductive shunts, the earth cable must be laid without
looping, to the degree possible.
4.5 Workpiece connection
The earth cable comes standard with two earth clamps that must be connected to the
workpiece.
When connecting the earth clamps, observe the following:
1.
The earth clamps must be connected directly to the workpiece or workpiece mount
(welding table, welding frame).
Steel constructions, railway tracks, pipes, etc., must not be used as current
conductors if they are not the workpiece to be welded.
2.
Place the earth clamps at equal distance from the welding location, if possible.
3.
The weld current circuit is not to be earthed, except if the workpiece or workpiece
mount are mandatorily earthed (pipes, ship construction, etc.).
4.
Before connecting the earth clamps, the following instructions for preventing the
“arc blow effect” must be observed!
