Nelson ALPHA 850 - 9.2 Troubleshooting

9 Repairs Page 49
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
9.2 Troubleshooting
Warning:
• If there is a system malfunction, the welding device must be
switched off, unplugged and secured against restart!
• After the problem has been repaired, it is absolutely necessary to
perform a functional inspection of the welding system!
Fault: Power supply
Features:
• ALPHA 850 shows no reaction
• “System voltage" LED doesn’t light up
• Fan won’t run
No.
Possible
cause
What is to be
tested or how?
Test
result
Test result achieved?
yes no
1
ALPHA 850 not
turned on
Turn on the ALPHA 850
Features
removed
ready No. 2
2
Power supply
defective or loose
contact
Check fan *)
Check power supply *) Fan runs No. 3 No. 3
3
Power supply
defective or loose
contact
Check network
protection *) Check
power supply *)
OK No. 4
Replace fuse
*
)
4
Cable break
Measure through the
cable *)
OK No. 5
Replace the
cable *)
5
Power switch error
Power supply clamp
error
Check the power cable
connection at the power
plug *)
Check the transformer
connection at the power
switch *)
Features
removed
ready No. 7
6
Fuse F1
1)
or cable
connection
Check “Transformer
PCB” cable *)
OK No. 7
Correct the
cable
connection *)
7
Power switch error
Cabling error
Transformer error
Shut down the ALPHA
850 and notify Tucker
service!
Tasks indicated with *) must be done only by electro-technical personnel!
1)
The arrangement of the equipment fuses on the internal control card can be found in Chapter 6
“Equipment fuses” or in the illustration on page 54.