Power Source Powered, Operator Panel On, Fan (23) Stopped - Cebora PLASMA PROF 123 ACC Service Manual

CEBORA S.p.A.

3.3.2 - Power Source powered, operator panel on, fan (23) stopped.

SOME PRE-CHARGE BOARD (3) CIRCUITS ARE LIVE EVEN WITH SWITCH (49) OPEN.
UNPLUG THE POWER SOURCE FROM THE MAINS SOCKET IN ORDER TO WORK
FAN (23) TEST.
Fan (23), terminals A (black wire) - H (blue wire), on fast-on connector, voltage = 230 Vac,
after contactor (2) closing.
♦ Check the wiring between fan (23) and starting capacitor.
♦ Replace starting capacitor.
♦ Replace fan (23).
DC-CAPACITOR (20) PRE-CHARGE AND TRANSFORMER (37) PRE-MAGNETIZATION
TEST.
DC-capacitor (20), terminals (+) and (-), voltage = >200 Vdc, contactor (2) closed, after
switch (49) closing.
♦ Check the wiring between fan (23), starting capacitor and power voltage changer.
♦ Check correct positioning of power voltage changer.
♦ Check for the presence of the three phases of supply voltage on transformer (37)
primary circuit, at the contactor (2) output.
♦ Check the wiring between J3, terminals 3 and 4 on pre-charge board (3) and terminals 6 and
13 of J10 on control board (47) (PRE-CHARGE AND PRE-MAGNETIZATION RELAY
COMMAND LINE).
♦ Check on J3 of pre-charge board (3), terminals 3 and 4, voltage = 25 Vac approximately for 1
s., starting 1 s. after switch (49) closing (pre-charge and pre-magnetization relay command
pulse). If incorrect, with Power Source off, temporarily disconnect J3 on pre-charge board (3)
and check the resistance between terminals 3 and 4 of J3 on pre-charge board (3). Correct
value = approximately 72 ohm (RL3 coil). If >Mohm replace the pre-charge board (3). If 0
ohm (short-circuit), replace pre-charge board (3) and control board (47). If correct, check the
supply voltage of the control board (47) taking special care for 27 Vac voltage carrying out
the CONTROL BOARD (47) POWER SUPPLY TEST of par. 3.3.1.
♦ Check the wiring between contactor (2) coil and terminals 5 and 12 of J10 on control board
(47) (CONTACTOR (2) COMMAND LINE).
♦ Check on contactor (2) coil terminals, voltage = 25 Vac with switch (49) closed, after DC-
capacitor (20) pre-charge and transformer (37) pre-magnetization phases. If incorrect, with the
Power Source off, temporarily disconnect J10 from control board (47) and check resistance
between the contactor (2) coil terminals. Correct value = approximately 5,6 ohm. If >Mohm,
replace contactor (2). If 0 ohm (short-circuit), replace contactor (2) and control board (47). If
correct, check the supply voltage of the control board (47) taking special care for 27 Vac
voltage carrying out the CONTROL BOARD (47) POWER SUPPLY TEST of par. 3.3.1.
3.302.269
WARNING
WITHOUT ANY DANGEROUS VOLTAGE.
Correct?
NO
Correct?
NO
YES
YES
13
12/04/2012