3.3.10 -61- Mains Voltage Below Minimum Allowed Value; 3.3.11 -62- Mains Voltage Over Maximum Allowed Value; 74- "Th1" On Display A. Secondary Diodes Group High Temperature; 77- "Th2" On Display A. Pfc Igbt (Boost Converter) High Temperature - Cebora 305 Manual De Servicio

3.3.10 -61- Mains voltage below minimum allowed value.

3.3.11 -62- Mains voltage over maximum allowed value.

The PFC board on power board (34) checks the mains
voltage status through the "VACIN" signal generated by
the power board (34) and commands the power source
stop if this exceeds the allowed limits.
The "VACIN" signal can be tested on J5, terminals 1(+)(or
R17, J5 pin 1 side) and 24(-), on power board (34).
Corrected value with mains nominal voltage (230 Vac)
= +1.5 Vdc, approximately.
The limits are fixed to:
− +1.0 Vdc, approx., corresponding to mains voltage
= 155 Vac, approx. (Err 61);
− +1.8 Vdc, approx., corresponding to mains voltage
= 275 Vac, approx. (Err 62).
Check correct fixing and connections cleaning of the PFC
board on power board (34), J5 connector.
Make sure conditions of the mains voltage relief circuit
components (D9, D10, R17, R22, R27, R29) on power
board (34).
3.3.12 -74- "th1" on display A. Secondary diodes
group high temperature.
3.3.13 -77- "th2" on display A. PFC igbt (boost con-
verter) high temperature.
With these alarms we recommend that you not shut off the
power source, to keep the fan running and thus cool the
unit more rapidly.
Normal operation is restored automatically as soon as the
temperature returns within the allowed limits.
− Make sure that the fan (32) is working properly;
− check for proper air flow and make sure there is no dust
or obstacles to cooling in the aeration tunnel;
− make sure that the operating conditions meet the
specification values, especially observe the "duty
cycle";
− make sure that the thermostat is properly mounted on
the secondary diode group dissipater, on power board
(34). Its signal can be tested on terminals TP21(+) and
TP14(-) (close to J7) on power board (34). Correct
value for ambient temperature = 0 Vdc, contact closed;
(+3.3 Vdc = contact open, alarm TH1);
− make sure that the thermostat is properly mounted on
the boost converter igbt (U5, U7) dissipater, on power
board (34). Its signal can be tested on terminals TP23(+)
and TP22(-) (close to L3) on power board (34). Correct
value for ambient temperature = 0 Vdc, contact closed;
(+5 Vdc = contact open, alarm TH2).
3302327/A
3.3.14 -99- "POWER OFF" on display A. Incorrect
mains voltage (machine shutdown).
This alarm indicates that the mains voltage, during the
operation, is go down under 50% approx., of the nominal
value.
This indication is normally present, for short time, every
time that power source is switched off.
In case of mains voltage lack, as an example after the
switch (30) opening, all control circuits remain powered
for few seconds due to the charge effects of the capacitors
in the various boards power supplies.
The power board (34) detects the mains voltage lack, noti-
fies it to the PFC board ("VACIN" signal), which stops the
power source with "POWER OFF" indication on display A.
The "VACIN" signal can be tested on J5, terminals 1(+)(or
R17, J5 pin 1 side) and 24(-), on power board (34).
Corrected value with mains nominal voltage (230 Vac)
= +1.5 Vdc, approximately.
The limit is fixed to +0.5 Vdc, approx., corresponding to
mains voltage = 80 Vac, approx.
Check correct fixing and connections cleaning of the PFC
board on power board (34), J5 connector.
Make sure conditions of the mains voltage relief circuit
components (D9, D10, R17, R22, R27, R29) on the power
board (34).
EN
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