Cebora SOUND MIG 3840/T Pulse Service Manual page 30

CEBORA S.p.A.
unbalance in one of the three phases, check the wiring between pre-charge board
(562), chokes (516+522), filter board (542) and switch (504). Restore any
deteriorated connections and replace any damaged components.
♦ Replace the pre-charge (562) and/or filter (542) boards and/or chokes (516+522).
CURRENT TRANSDUCER (529) POWER SUPPLY TEST.
Micro board (543), connector J1, terminals 4(+) and 5(-) = +15 Vdc; terminals 1(+) and 5(-) =
-15 Vdc.
♦ Check the wiring between current transducer (529) and J1 micro board (543).
♦ With power source off, temporarily disconnect connector J1 from micro board
(543) and check the resistance between terminals 4 and 1 of the patch connector
disconnected from J1. Correct value = approximately 2 Kohm. If incorrect,
replace the current transducer (529).
♦ With J1 disconnected from micro board (543), powers up the power source and
check the voltage on J1 of micro board (543), terminals 4(+) and 5(-) = +15 Vdc;
terminals 1(+) and 5(-) = -15 Vdc. If incorrect, replace control board (543).
♦ Replace current transducer (529) and/or control board (543).
POWER SOURCE OUTPUT CURRENT FEEDBACK SIGNAL TEST.
Micro board (543), connector J1, terminals 3(+) – 5(-) = +360 mVdc, +/- 10 mVdc with
power source powered; approximately +3,3 Vdc, or fig. 5.2.4, (output current feedback
signal) with power source on resistive load, in the table conditions.
♦ Correct operation.
♦ Make sure that the micro board (543) is correctly set by carrying out the MINIMUM
CURRENT THRESHOLD SETTING TEST in par. 3.7.10.
♦ Check the wiring between the terminals of the transformer (531) secondary circuit, diode
group (567), and output terminal (+)(BR) of the power source, and between the transformer
(531) central socket, choke (530), and output terminal (-)(BO) of the power source. If you
find short-circuits or loose connections, restore the original connections and replace any
damaged components.
♦ Make sure the current transducer (529) is properly mounted on the output cable between
choke (530) and power source (-)(BO) output terminal, more specifically that the cable is
centered in the transducer hole, and that it passes through perpendicularly.
♦ Make sure that the CAN-BUS communication line is working properly between control board
(543), motor control board (232) and control panel (324), performing tests with different set-
ups or, if necessary, the test in par. 3.5.3 and the instructions described in par. 3.4. "Operating
sequences".
♦ Replace transformer (531) and/or diode group (567) and/or choke (530).
♦ Replace the control board (543) and/or current transducer (529).
3.302.191
Correct?
YES
Correct?
NO
NO
YES
30
15/02/05