9
Repairs
Page 50
Stud welding unit
operating manual
Date:
July 2021
ALPHA 850
07.2021 / EN
Rev.:
A
Fault:
Overload/phase error
Features:
•
ALPHA 850 is switched on
•
“System voltage" LED lights up
•
Gun doesn’t work when start triggered
•
no weld
No.
Possible
cause
What is to be
tested or how?
Test
result
Test result achieved?
yes
no
1 Device overloaded or
phase error
“Fault” LED lights green
or red?
Green LED
No. 2
Red LED
No. 3
2 Phase error L1/L2/L3 Check power supply *)
(fuse, plug, cable)
Check the power cable
connection at the power
plug *)
Check the transformer
connection at the power
switch *)
Set the connection
voltage *)
White LED
ready
No. 7
3 Device overloaded,
inadequate cooling
Check fan *)
Fan runs
No. 5
No. 4
4 Phase error L1
Fuse F4
1)
defective
Blower connection
fan
Check power supply *)
(fuse, plug, cable)
Check the fuse
(315 mA) *)
Check fan connection *)
Check fan *)
Features
removed
ready
No. 7
5 Welding sequence
too high
Let the welding device
cool
Reduce the welding
sequence
White LED
ready
No. 6
6 Fan disabled or dirty
Improve air circulation *)
Check the ventilation
slots
Clean inside of device *)
White LED
ready
No. 7
7 PCB defective
Replace the PCB *)
Features
removed
ready
No. 8
8 Transformer error
Shut down ALPHA 850
Notify
Tucker
service!
Tasks indicated with *) must be done only by electro-technical personnel!
1)
The arrangement of the F4 equipment fuse can be found in Chapter 6 “Equipment fuses”.
