ESAB LAW 510 Service Manual page 32

LL.9 - - L.11
Measurement of the synch pulses at contacts E1- -E3.
The display shows 50 if the synch voltage frequency is 50 Hz.
L.12
Welding gun switch.
The display shows 1 1 1 when the welding gun switch is closed and
0 0 0 when it is open.
L.13 - - L.14
These tests are not relevant here.
L.15 Firing pulses on outputs A1 - - A12.
Connect contact A of the test device to pin A1 on the circuit board. If
firing pulses are present on A1, the display will show 0 1 0. Test outputs
A3, A5, A7, A9 and A11 in a corresponding way.
Disconnect contact A of the test device from the circuit board.
L.16
The thermal overload cutout.
When the circuit from the thermal overload cutout (at connections D1- -D6)
is closed, the display will show 0 0 0.
If the cutout contacts are open, the display will show 1 1 1.
L.17
Crater filling.
When the crater filling input L4 is open, the display shows 1 1 1.
When input L4 is low (= connected to 0VB at board contact L3), the
display shows 0 0 0.
L.18
Fixed firing angle / controlled firing angle.
K2- - K3 closed = fixed firing angle. The display shows 0 0 0.
K2- -K3 open = controlled firing angle. The display shows 1 1 1.
L.19
Machine type.
J3- - J4 closed = LAW 500/510. The display shows 5 0 0.
J3- - J4 open = LAW 400/410. The display shows 4 0 0.
L.20
Preset, board connector H7.
Test number L.20 is not available on circuit board 0486 220 880.
This test facility is used only with an MEK 4S and MEK 4SP wire feed
unit. With terminal H7 open, presetting is not selected, and the display
indicates 0 0 0.
With terminal H7 connected to 0 VB, presetting is active, and the
display indicates 1 1 1.
Turn off the machine and refit the connections to the circuit board as they were originally.
The test device
claw0de1
claw0e20
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