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♦ Check the terminals 4 and 1 of J1 on power
board (56) are not in short circuit. If the case
look for the short circuit cause between the
power components connected to the DC_
BUS (see Fig. 2.3.1).
♦ Replace power board (56).
SERVICES TRANSFORMER (54) POWER SUPPLY
TEST.
□ Services transformer (54), terminals 0 - 400 = 400 Vac,
approximately, terminals 0 - 220 = 220 Vac, approxi-
mately.
YES
♦ Check the wiring between services trans-
former (54) primary circuit terminal board
and terminals J-L1 and J-L2 on power board
(56).
EN
♦ Check connections on the printed circuit of
power board (56), between terminals J-L1,
J-L2 with terminals IN-L2, IN-L3 (see Con-
nectors map, par. 5.6).
♦ Make sure integrity of the fuse on the ser-
vices transformer (54) primary winding. If
interrupted, replace it, and check, with power
source off, the primary winding resistance
on the services transformer (54) terminals
board, with fuse inserted. Correct value: pri-
mary 0 – 400 Vac = 13 ohm approximately,
primary 0 – 220 Vac = 7 ohm approx. If not
correct, replace services transformer (54).
AC POWER BOARD POWER SUPPLY TEST.
□ Power board (56), connector J6, terminals 1-4 = 24 Vac
(fans power supply, INV power board).
□ Power board (56), connector J6, terminals 3-6 = 30
Vac (panel power board power supply, (47), wire feed
motor (11), solenoid valve (13)).
□ Power board (56), connector J4, ternimals
1-2 = 18Vac (power supply for interface
circuits
with
YES
♦ Check the wiring between J6-J14 on power
board (56) secondary windings of the service
transformer (54).
♦ Check the integrity of the fuses on the sec-
ondary 18 Vac, 25Vac and 30 Vac of the ser-
vice transformer (54). If interrupted, replace
24
Correct?
NO
cooling
group
Correct?
NO
them by checking the resistance on terminals
1-4 and 3-6 of connector J6 and 1-2 of con-
nector J4 on the power board (56). Corrected
value => Mohm, on both measuring points
and in both measuring directions. If not cor-
rect, replace the power board (56).
DC CONTROL POWER SUPPLY TEST.
□ Power board (56), connectors:
− J14-1 (+), J14-5 (-) = +42 Vdc, approx. (Motor speed
control circuits on panel board (47);
− J14-3 (+), J14-6 (-) = +15 Vdc, approx. (Logic power
supply on panel circuit (47);
− J7-B (-), J16-1 (+) = +24 Vdc;
− J5-B (-), J13-1 (+) = +15 Vdc;
− J5-B (-), J13-3 (+) = -15 Vdc;
− J5-B (-), heatsink of U4 (+) = +5 Vdc;
− J5-4 (-), J5-1 (+) = +25 Vdc, with connector (14)
Fig.3.2.c-d free (cooling group interface circuits).
All with switch (14) closed.
YES
♦ Locate eventual faulty components on power
board (56), basing on the Connectors map of
par. 5.6.
♦ Replace power board (56).
PANEL BOARD (47) POWER SUPPLY TEST.
□ Panel board (47), connector J20, terminals 1(+) and 2(-)
= +15 Vdc approx., with switch (14) closed.
□ Panel board (47), connector J20, terminals 4(+) and 3(-)
= +42 Vdc, with switch (14) closed.
□ Panel board (47), connector J7, terminals 1(+) and 3(-)
= +5 Vdc, with switch (14) closed.
□ Panel board (47), connector J7, terminals 2(+) and 3(-)
= +3.3 Vdc, with switch (14) closed.
YES
♦ Check the wiring between J4 on (56) power
GRV14).
board and J20 panel board (47).
♦ If the uncorrected voltage is the +3,3 Vdc
search for anomalies in the panel board (47)
power supply circuits (U18-U21 etc) (see
Connectors map, par. 5.7).
♦ Replace power (56) and/or panel (47) boards.
■ Replace power (56) and/or panel (47) boards.
Correct?
NO
Correct?
NO
3302339/A
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