Troubleshooting; The Power Source Does Not Start, Control Panel Off - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.

3.5 - Troubleshooting.

ANY INTERNAL INSPECTIONS OR REPAIRS MUST BE CARRIED OUT BY QUALIFIED
BEFORE REMOVING THE PROTECTIVE GUARDS AND ACCESSING INTERNAL
PARTS, DISCONNECT THE POWER SOURCE FROM THE MAINS AND WAIT FOR THE
THE DISCHARGE TIME FOR THE DC-CAPACITORS (561) IS HEAVILY AFFECTED BY
THE OPERATING MODE OF THE FLYBACK BOARD (539). UNDER NORMAL
CONDITIONS THE TIME IS APPROXIMATELY 3 MINUTES, WITH THE FLYBACK
BOARD (539) BROKEN OR DISCONNECTED IT MAY BECOME 6 MINUTES.
Items in boldface describe problems that may occur on the machine (symptoms).
Operations preceded by this symbol refer to situations the operator must determine (causes).
♦ Operations preceded by this symbol refer to actions the operator must perform in order to
solve the problems (solutions).

3.5.1 - The power source does not start, control panel off.

MAINS SUITABILITY TEST.
No voltage for mains protection.
♦ Eliminate any short-circuits on the connections between power cable, switch
(504), filter board (542), chokes (516+522) and pre-charge board (562).
♦ Make sure that the terminals of the chokes (516+522) on the terminal board (265)
are not short-circuited towards the earth of the power source.
♦ Replace chokes (516+522) and/or filter (542) and/or pre-charge (562) boards.
♦ Mains not suitable to power the power source (ex.: insufficient installed power).
MAINS CONNECTION TEST.
Terminals L1, L2 and L3, on pre-charge board (562) = 3 x 400 Vac, with switch (504) closed.
♦ Check power cable and plug and replace if necessary.
♦ Check switch (504), and replace if defective.
♦ Check connections between switch (504), filter board (542), terminal board (265)
of the chokes (516+522) and pre-charge board (562).
♦ Check the mains voltage conditions.
♦ Replace the chokes (516+522) and/or filter board (542).
3.302.191
WARNINGS
PERSONNEL.
INTERNAL CAPACITORS TO DISCHARGE.
NOTE
Correct?
NO
Correct?
YES
YES
NO
16
15/02/05