5
Operating and display elements
Page 30
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
5.2 Display elements
The LED display elements signal specific functions of the welding process and are
useful for troubleshooting the welding system.
After connection of the ALPHA 850 welding device (see Chapter 4), the following
functions can be understood visually.
*) The position numbers in parentheses refer to the position numbers in the illustration on
page 28.
LED (white, green, red): Fault (Pos. 7*)
Base colour:
white: no fault
Colour change: green:
Fault (no network phase)
Colour change:
red: Fault (overheat)
LED (green): Contact (Pos. 8*)
LED lights up when the stud contacts the workpiece.
The external welding circuit is closed.
LED goes out when the stud is lifted from the workpiece.
LED (green): System voltage (Pos. 4*)
LED lights up when the ALPHA 850 is switched on.
LED goes out when the ALPHA 850 is switched off.
LED (yellow):
Start weld cycle (Pos 5*)
LED lights up when a start signal is issued:
•
Standard operation: The gun’s start button is pressed.
•
Automatic mode: Pulling the stud holder off the stud.
LED goes out when the start button is let up or when the weld
signal is taken away.
LED (yellow):
Welding gun coil circuit (Pos. 6*)
LED goes on when a welding gun is correctly connected.
The coil current circuit is closed.
LED goes out when the coil current circuit is interrupted.
