System Powered, The Wire Feeder Motor Does Not Work - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.

3.5.7 - System powered, the wire feeder motor does not work.

WIRE FEEDER MOTOR (404) TEST.
Motor control board (232), connector J19, terminals 1 (-) and 2 (+) = +17 Vdc, in MIG mode,
with button (AR) on control panel pressed (fixed speed wire test).
Motor control board (232), connector J19, terminals 1 (-) and 2 (+) = between approximately
+2 and +46 Vdc, in MIG mode, with start button pressed, adjustable using the knob (N) based
on the set program and wire diameter.
♦ Correct operation.
♦ Check the wiring between J19 motor control board (232) and wire feeder motor (404).
♦ Make sure there are no mechanical impediments blocking the motor (404).
♦ With the power source off, temporarily disconnect the wire feeder motor (404) terminals from
connector J19 on motor control board (232), and make sure the resistance between the motor
terminals left free = approximately 1,5 ohm (motor winding resistance). If 0 ohm (short-
circuit), replace wire feeder motor (404) and motor control board (232). If >Mohm (winding
broken), replace wire feeder motor (404).
♦ Check the motor rotation direction. If incorrect, reverse the wires on terminals J19 of motor
control board (232).
WIRE FEEDER MOTOR ENCODER TEST.
Motor control board (232), connector J17, terminals 2 (+) and 4 (-) = fig. 5.2.1, with button
(AR) on control panel pressed (fixed speed wire test) (speed feed-back signal from motor
encoder). (In case of different speed set via the torch potentiometer or knob (N), the
waveform in fig. 5.2.1 changes only in frequency, maintaining the same form, amplitude and
duty-cycle).
♦ Check the wiring between connector J17 motor control board (232) and the
encoder on the wire feeder motor (404).
♦ Make sure that on J17 of motor control board (232), terminals 1(+) and 4(-),
voltage = +5 Vdc. If incorrect, with power source off, disconnect the connector
J17 from the motor control board, and check the resistance between the terminals
1 and 4 of the patch connector disconnected from J17. Correct value =
approximately 20 Kohm. If short-circuited, replace motor (404) and motor control
board (232). If the circuit is interrupted replace the motor (404).
♦ With power source off, disconnect the connector J17 from the motor control board
(232), and check the resistance between the terminals 2 and 4 of the patch
connector disconnected from J17. Correct value = approximately 20 Kohm. If
short-circuited or if the circuit is broken, replace motor (404).
♦ Replace the wire feeder motor (404).
♦ Replace motor control board (232).
♦ Replace motor control (232) and/or control panel board (324).
♦ Replace the wire feeder motor (404).
3.302.191
Correct?
NO
Correct?
YES
YES
NO
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15/02/05