49 - Nozzle Current During Cutting; 50 - Torch Adapter Protection Not Inserted - Cebora PLASMA PROF 164 HQC Service Manual

CEBORA S.p.A.
TORCH BOARD (42) POWER SUPPLY TEST.
Torch board (42), connector J11, terminals 1 and 2 = 8 Vac.
♦ Check the wiring between J11 torch board (42) and J3 fuse board (50).
♦ Check fuse F5 fuse board (50); if broken, replace and make sure that terminals 1 -
2 of J11 on torch board (42) are not short-circuited.
♦ Check 8 Vac voltage on terminals TP6 - 8V of fuse board (50);if missing, check
the wiring between the service transformer and fuse board (50), and if necessary
replace the service transformer (50).
♦ With Power Source off, temporarily disconnect J8 from torch board (42) and check the
resistance on terminals 1 and 4 of J8 on torch board (42). Correct value = approximately 170
Kohm. If incorrect replace torch board (42).
♦ Check the wiring between J13 torch board (42) and J14 control board (38).
♦ With Power Source off, temporarily disconnect J14 from control board (38) and check the
resistance on terminals 1 and 2 of J14 on pilot arc board (38). Correct value = coupling of two
diodes in one direction and 4.7 Kohm with the instrument probes reversed. If incorrect,
replace control board (38).
♦ Replace the torch (42) and/or control (38) boards.

3.4.7 - 49 - Nozzle current during cutting.

When cutting begins, the nozzle current must become null. If this does not occur, there may
be problems with the torch and poor cutting quality, and thus this situation is signaled as error
49. For an analysis of the problem, perform the tests in par. 3.3.10.

3.4.8 - 50 - Torch adapter protection not inserted.

On Plasma PROF 164 the torch adapter and corresponding protection are not present on the
Power Source. The protection presence signal is replaced by the dipswitch DIP1-D on torch
board (42).
TORCH BOARD (42) 24V POWER SUPPLY TEST.
Torch board (42), connector J12, terminals 1 and 2 = 24 Vac.
♦ Check the wiring between J12 torch board (42) and J3 fuse board (50).
♦ Check fuse F4 on fuse board (50); if interrupted, replace and check the resistance
on terminals 1 and 2 of J12 on torch board (42). Correct values = approximately
300 ohm, with the circuit breakers on the Power Source safety guard and module
HV18 open; 150 ohm with the circuit breakers on the guard closed. If incorrect
replace torch board (42).
♦ Make sure there is 24 Vac voltage on terminals TP5 - 24V of fuse board (50); if
missing, check the wiring between the service transformer and fuse board (50),
and if necessary replace the service transformer (50).
3.302.218
Correct?
YES
NOTE
Correct?
YES
NO
NO
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9/8/2006