Cebora 961 - Page 9

CEBORA S.p.A. 9
Correct?
YES
NO
♦ Check the wiring between switch (40) and control board (4).
♦ Check integrity of fuses on control board (4), considering that:
- F1 is inserted in the supply circuits for control board (4) service transformer,
contactors (32), solenoid valves (6) and (7), and fan (34).
For checking performs:
CONTACTOR TLP (32) COMMAND TEST, par. 3.3.4;
CONTACTOR TLM (32) COMMAND TEST, par. 3.3.6;
PILOT ARC EL1 (7) SOLENOID VALVE TEST, par. 3.3.3;
PILOT ARC FIRING SOLENOID VALVE ELT (6) TEST, par. 3.3.4;
FAN (34) TEST, par. 3.3.1.
- F2 is inserted in the insulated supply circuit for torch start button.
For checking performs START COMMAND TEST, par. 3.3.2.
- F3 is inserted in the control board (4) supply circuit. In this case replace control
board (4).
♦ Check the mains voltage conditions.
♦ Replace control board (4).
FAN (34) TEST.
Correct?
 Control board (4), terminals J1 and J2 = approximately 230 Vac, with switch (40) closed and
both with mains at 230 and at 400 Vac.
YES
NO
♦ Check the wiring between terminals J1 and J2 of control board (4) and fan (34).
♦ Check the wired bridge between terminals 1 and 2 of J3 on control board (4).
♦ Make sure the control board (4) supply voltage presence, performing, if necessary,
the CONTROL BOARD (4) POWER SUPPLY TEST, par. 3.3.1.
♦ Disconnect temporarily, with power source off, the wires of fan (34) from J1 and
J2 of control board (4), and make sure the resistance of the fan (34) terminals.
Corrected value = 60 ohm approximately. If 0 ohm, short-circuit, replace fan (34)
and fuse F1 on the control board (4).
♦ Replace control board (4).
♦ Make sure that there are no mechanical impediments blocking the fan (34).
♦ Disconnect temporarily, with power source off, the wires of fan (34) from J1 and J2 of control
board (4), and make sure the resistance of the fan (34) terminals. Corrected value = 60 ohm
approximately. If >Mohm, circuit interrupted, replace fan (34).
♦ Replace fan (34).
♦ Replace lamp (22).
♦ Replace control board (4).
3.302.170 06/07/04