Nelson ALPHA 850, Руководство по эксплуатации

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9 Repairs
Page 53
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
Electronics error search
LED displays on the control device and diagnostic LEDs on the internal control card:
Action Display Comments
Switching on
- System voltage LED (Pos. 4*)
goes on
- no display: Replace fuse F1
1)
on the
PCB
- Coil circuit LED (Pos. 6*) goes
on
- lights only if the welding gun is
connected
- Diagnostic LED H2
1)
lights up for
about one second after switch-
on.
- Diagnostic LED H2
1)
must not light
up in any other operational state
Air release
(Confirmation of the
welding gun without
workpiece contact)
- Start weld cycle Loosening
(Pos. 5*) glows as long as the
release button on the welding
gun is pressed
- If no display: connect correctly
- If still no display: Remove the
welding gun and check/make the
electrical connections
- Diagnostic LEDs H3, H4, H7, H9
- H14
1)
briefly go on when the
release button on the welding
gun is pressed
Place the welding
gun on the
workpiece - Contact LED (Pos. 8*) goes on - If no display: Connect the earth
cable and welding gun correctly
- Diagnostic LED H8
1)
always
goes on upon workpiece contact
- Display goes out during welding
- Welding in short circuit (no arc
occurs); set the welding gun up
correctly
Welding - Diagnostic LED H8
1)
goes out
- Diagnostic LEDs H3, H4, H7, H9
- H14
1)
go on only during
welding
- If no display:
Welding in short circuit (no arc
occurs)
- Set up the welding gun correctly
Other general
displays - Diagnostic LED H5
1)
always
goes on, regardless of welding
gun connection
- no display: Replace fuse F2
1)
(welding gun) on the PCB
*
)
The position numbers in parentheses refer to the position numbers of the LEDs on the front plate of
the control device (

see chapter 5, page 28).
1)
The arrangement of the internal fuses (F1, F2) and the diagnostic LEDs (H2–H18) on the internal
PCBs can be found in the illustration on the next page.