67 - Mains Voltage Does Not Meet Specifications - Cebora PLASMA PROF 123 ACC Service Manual

CEBORA S.p.A.
♦ Check delivery of output voltage, performing, if necessary, the tests in par. 3.3.6.,
taking special care the NOZZLE VOLTAGE TEST of par. 3.3.6.
♦ Replace sensor board (52) and/or control board (47).
♦ With Power Source off, temporarily disconnect J5 from sensor board (52) and check the
resistance between terminals J4 and 1 of J5 on sensor board (52). Correct value =
approximately 10 Kohm. If different replace the sensor board (52).
♦ Check the wiring between J3 sensor board (52) and J16 control board (47).
♦ With Power Source off, temporarily disconnect J16 from control board (47) and check the
resistance on terminals 1 and 2 of J16 on control board (47)(V_NOZZLE signal). Correct
value = 4.7 Kohm approximately. If incorrect, replace control board (47).
♦ Check the supply voltage for the sensor board (52) performing, if necessary, the SENSOR
BOARD (52) POWER SUPPLY TEST of par. 3.4.5.
♦ Check electrode and torch nozzle; replace if worn or damaged.
♦ Check good isolation of torch internal parts, cable included and replace the complete torch if
necessary.
♦ Replace sensor board (52) and/or control board (47).

3.4.11 - 67 - Mains voltage does not meet specifications.

The measure board (57) contains detect and analysis circuit of mains voltage, whose result is
sent to control board (47). Specifically, the presence and correct values of the mains voltage
three phases are detected by checking if their values meet the allowed limits.
The mains voltage is taken on the rectifier bridge (34) terminals and consequently the mains
analysis is performed only when contactor (2) is closed (after pre-charge phase).
MAINS VOLTAGE SIGNAL TEST.
Measure board (57), connector J2, terminals 1-3 = terminals 3-5 = terminals 5-1 = 190 Vac
approximately, with contactor (2) closed (pre-charge phase completed).
♦ Check the wiring between J2 measure board (57) and rectifier bridge (34)
terminals.
♦ Make sure the presence and correct values of the mains voltage three phases
performing, if necessary, the tests of par. 3.3.1.
MEASURE BOARD (57) POWER SUPPLY TEST.
Measure board (57), connector J5, terminals 1(+) and 6(-) = +5 Vdc, with contactor (2) closed
(pre-charge phase completed).
♦ Check the wiring between J5 measure board (57) and J19 control board (47).
3.302.269
Correct?
YES
Correct?
YES
NO
NO
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12/04/2012