37
14. Troubleshooting
Line
Problem
Cause
Solutions
1
The humidifier has been
C1: Cabinet not powered.
S1: Check tension between terminals L and N (220Vac).
powered and switched ON
C2: Blown fuses.
S2: Check the fuses on the transformer.
but does not work.
2
The unit is ON but does
C1: The value measured by
S1: Check set-point and differential with the value
not start working.
the probe is higher than
indicated by the probe.
the set-point.
C2: Wrong regulation logic.
S2: Check the regulation logic parameters.
(ON/OFF version: see C01 and C02;
Proportional version: see C22 and C23).
See Operation Guide page 25.
C3: The regulator does
S3: Check that power supply to terminals 5 and 6 (G0)
not work (faulty regulator).
on the AD4 card is over 5Vdc.
NB: Proportional model,
NB: Proportional models, just one or both regulators.
just one or both regulators.
3
The display shows “SEA”
C1: Disconnected or
S1: Be sure that the probe is connected to the
and the humidifier does
short-circuited probe.
terminals of the cabinet.
not start.
C2: Out-of-range signal probe. S2: Turn ON the MC humidifier and check that:
a) power supply between terminals 3 and 5
(6 and 8 in duct models) is correct (+24Vdc);
b) the probe signal between terminals 3 and 4
(6 and 7 in duct models) ranges between 0
and 1Vdc;
c) the sensor is not wet.
C3: Probe not suitable for
S3: Be sure that the output probe signal is suitable
the instrument.
for the signal of your CR72 (0-1VDC).
4
The display shows “ALA”
There is no remote ON/OFF
a) Check continuity between terminals 1 and 2:
and the humidifier does
command: the contact between
an open contact indicates a power difference.
not start.
terminals 1 and 2 is open.
b) Check the connections at input D.IN and REF
of your CR72.
5
Water saturation with
The fan has stopped before
Command the remote ON/OFF (terminals 1 and 2)
plenty of drops due to
the “limit” probe intervened
by means of a flow switch or a differential pressure
the OFF routine of the fan. to force the humidifier into
switch: this is the only way to avoid this problem.
The 'limit' probe does
an OFF routine.
not stop the humidifier.
6
The output air pressure
C1: The compressor is not
S1: Check the capacity of the compressor in relation
does not reach 2.1bar.
capable of supplying the
to the overall consumption of the installation.
required air (inlet
pressure always <5bar).
C2: Incorrect setting of the
S2: Set again the pressure reducer (see page 21).
pressure reducer.
C3: Proportional version only:
S3: Check again the selected set-point and differential in
the value measured by
relation to the probe values (see page 27/28)
the probe/s is approaching
the set-point (modulation
in progress).
C4: Troubles on the feedback
S4: a) the command output towards the AD4 card, T1
air system:
and T2 commands 0-20V phase cut. With 0Vdc
a) the actuator is not capable
between T1 and T2 the valve remains completely
of opening the valve;
closed. With 20Vdc the valve is completely open.
b) the probe output signal is
If you want to check the integrity of the valve,
too high with respect to
remove the actuator (this forces the valve to close)
the actual pressure value;
then press the cylinder/spring body.
c) the command of the AD4
b) With pressure = 2.1bar between terminals Ic and
card towards the actuator
G0 the signal must be 3.25Vdc, otherwise the probe
is incorrect.
signal is out-of-range.
c) Disconnect the cable to terminal Ic: the signal
between terminals T1 and T2 must reach 20Vdc.
If not, there are troubles on the AD4 card.
