Cooling Unit Does Not Work Correctly - Cebora PLASMA PROF 164 HQC Service Manual

CEBORA S.p.A.

3.3.11 - Cooling unit does not work correctly.

COOLING UNIT ENABLE TEST.
Control board (38), connector J20, terminals 2 - 4 = 0 Vac, contact closed, unit connected (27
Vac, contact open, unit not connected) with Power Source powered (this signal is actually
disabled by means of a jumper in the flow meter wiring).
♦ Check the wiring between connector J20 control board (38) and flow meter (12).
♦ Make sure there is a jumper in the wiring of the flow meter (12) that puts
terminals 2 and 4 of the patch connector in contact on J20 of control board (38).
♦ With Power Source off, temporarily disconnect J20 from control board (38), and
make sure that when the Power Source is turned back on, on terminals 2 and 4 of
J20 on control board (38) voltage = 27 Vac. If incorrect, replace control board
(38).
♦ Replace the control board (38).
♦ Replace the control board (38).
FLOW METER (12) TEST.
Control board (38), connector J20, terminals 3 - 4 = 0 Vac, contact closed, flow correct (27
Vac, contact open, insufficient flow) with pump (13) running.
♦ Check the wiring between connector J20 control board (38) and flow meter (12).
♦ Make sure that the lines of the cooling circuit are not clogged.
♦ Make sure that the hydraulic circuit is under pressure. If not, check the pump (13)
and replace if defective (see test below).
♦ Check the level of the cooling liquid in the tank (10). Top up the tank if below
minimum level.
♦ With Power Source off, temporarily disconnect J20 from control board (38), and
power up the Power Source again to check, on terminals 3 and 4 of J20 on control
board (38) voltage = 27 Vac. If incorrect, replace control board (38).
♦ Make sure the flow meter(12) is functioning. If defective, replace.
♦ Replace the control board (38).
♦ Replace the control board (38).
PUMP (13) TEST.
Terminal of the pump (13) = approximately 230 Vac, with Power Source powered.
♦ Check the wiring between terminals J8-A and J8-B of pre-charge board (45), fuse
in the rear panel of the Power Source, terminals of the pump (13) and fast-on
patch terminals from the voltage change of the transformer (27).
3.302.218
Correct?
YES
Correct?
YES
Correct?
YES
NO
NO
NO
32
9/8/2006