CEBORA S.p.A.
41
proportional to the temperature, and thus difficult to check. If necessary replace the thermostat
board (551).
−
Check the wiring between J1 interface board (543), and thermostat board (551) on igbt group
(548).
−
Make sure that on J1 of control board (543), terminals 3(+) and 4(-) voltage = +5 Vdc. If
incorrect, with power source off, temporarily disconnect J1 on control board (543) and check
the resistance between terminals 3 and 4 of the patch connector disconnected from J1. Correct
value = junction of one diode in one direction and >Mohm with the probes reversed. If
incorrect replace the thermostat board (551), and check the voltage on terminals 3 and 4 of J1
again without the thermostat board connection. If incorrect, also replace control board (543).
−
Replace control board (543).
3.7.22
- 75 - “H2O” on display (O). Low pressure in the cooling circuit.
The pressure switch (37) measures the coolant pressure in the cooling circuit. For an analysis
of the corresponding circuit, see PRESSURE SWITCH TEST (127), par. 3.5.14.
3.7.23
- 80 - “OPn” on display (O). Wire feed unit guard open.
This alarm indicates that the safety cover of the wire feed unit is open.
−
Check the wiring between J1 motor control board (232), and switch (211) on the guard of the
wire feed unit.
−
Check the voltage on J1 of motor control board (232), terminals 1(+) and 2(-) = 0 Vdc, correct
condition = cover closed; +15 Vdc = alarm = cover open. If incorrect, replace switch (211) or
motor control board (232).
−
Make sure that the switch (211) and the unit cover are properly mounted. If incorrectly
positioned, correct; replace if defective.
−
Replace motor control board (232).
3.7.24
- 99 - “OFF” on display (O). Incorrect mains voltage (machine shutdown).
This signal normally appears whenever the power source is shut off.
When mains voltage is missing, for example after opening the switch (504), all control
circuits remain powered for a few seconds due to the effects of the DC-capacitor (561)
discharge. The pre-charge board (562) detects the missing mains voltage, notifies the interface
board (543) (signal on J7 4-5), which orders the power source to stop, and notifies the control
panel (324) via CAN-BUS to signal “OFF” on display (O).
Carry out the MAINS CONNECTION TEST and POWER SUPPLY TEST, in par 3.5.1, and
replace the pre-charge board (562) if necessary.
3.302.191
15/02/05
