Cooling Unit Gr54 Does Not Work Correctly - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.

3.5.14 - Cooling unit GR54 does not work correctly.

Operation of the GR54 cooling unit depends on the welding process selected, and it may be
enabled or disabled via a setting on the control panel (324) (see Instruction Manual).
COOLING UNIT POWER SUPPLY TEST.
Pre-charge board (562), connector J4, terminals 1 and 6 = 400 Vac, terminals 1 and 3 = 230
Vac, with power source powered.
♦ Check the wiring between connector J4 of pre-charge board (562) and
autotransformer (540).
♦ Make sure on pre-charge board (562), terminals A and B of J5,voltage = 400 Vac
approximately. If not correct, check wiring between J5 pre-charge board (562) and
terminals J-L1 and J-L2 on filter board (542), make sure conditions of the mains
voltage, performing if necessary the MAINS CONNECTION TEST of par. 3.5.1,
replace filter board (542).
♦ Check the fuse on autotransformer (540). If interrupted replace it and disconnect
temporarily, with power source off, connector J4 on pre-charge board (562) and
make sure resistance on autotransformer (540) terminals. Correct value on 0-400
terminals = 15 ohm, approximately; on 0-230 terminals = 8 ohm approximately. If
not correct replace autotransformer (540).
♦ Replace the pre-charge board (562).
COOLING UNIT ENABLE TEST.
Pre-charge board (562), connector J2, terminals 5(+) and 6(-) = +24 Vdc, with cooling unit
enabled via the control panel.
♦ Check the wiring between J2 pre-charge board (562) and J5 on interface board
(543).
♦ With power source off, temporarily disconnect connector J5 on interface board
(543) and check the resistance between terminals 5 and 6 of J2 on pre-charge
board (562). Correct value = approximately 2300 ohm. If short-circuited, replace
the pre-charge (562) and control (543) boards. If the circuit is open replace the
pre-charge board (562).
♦ Make sure control panel is working correctly, performing, if necessary, tests of
par. 3.5.3.
♦ Replace the control (543) and/or pre-charge (562) boards.
PUMP (125) AND FAN (131) TEST.
Terminals of fast-on connector (inserted in the wiring between cooling unit and power source)
= 230 Vac, with cooling unit enabled.
3.302.191
NOTE
Correct?
YES
Correct?
YES
NO
NO
33
15/02/05