CTA
Instruction Manual
MPE
Reference: MT0027DA
This document may be modified without prior notice
16
Revision date: 11/05/06
Even partial reproduction is prohibited without authorisation in writing
PROBLEM
CAUSE
SYMPTOM
REMEDY
E.
HP Pressure
switch cuts in
The motorised fan does not function.
All the LEDs on the electronic board are
OFF as if the power supply had failed.
Repair or replace the fan. Press the
red re-set button on the pressure
controller.
(manual)
Ambient temperature Too high.
Ambient air temperature conditions
higher than maximum authorised value
Return the ambient temperature to
within the limits by, for example,
increasing room ventilation. Press the
red re-set button on the pressure
controller.
Recirculation of hot air due to incorrect
installation.
Very high temperature in room
Modify the position of the machine or
the obstructions to eliminate air
recirculation. Press the red re-set
button on the pressure controller.
Condensing unit fins dirty.
The digital display panel continuously
indicates a value
> 4°C.
Clean the condensing unit fins.
Press the red re-set button on the
pressure controller.
Condensing unit face clogged.
The digital display panel indicates
a value > 4°C continuously
Clean the condensing unit front face.
Press the red re-set button on the
pressure controller.
Relatively high ambient air Temperature
and fan turning in wrong direction (if
three-phase power supply).
Cooling air passes first passes through
the fan and then through the
condensing unit.
Reverse two machine power supply
phases.
Press the red re-set button on the
pressure controller.
compressed air flow rate or temperature
too high and high ambient temperatures
at the same time.
High dew point (which means a high
evaporation pressure of raised and
higher purging from the separator).
Correct the temperature and the air
flow to pre-set limits.
Press the red button on the Pressure
switch cap.
F.
Low pressure
(LP) Pressure
switch cuts in.
(auto.)
Refrigerant leak
The compressor stops before cooling the
thermal mass to the pre-set value or
compressor stop and start many times.
Have the circuit checked for leaks by
a refrigeration technician and
eliminate them.
Have a refrigeration technician Refill
the circuit.
After each LP switch cut, no display
during 2 minutes and compressor start
automatically 2 minutes after.
On first start-up if the ambient
temperature is too low and the thermal
mass is at the same temperature as the
ambient temperature.
Ditto
Correct the ambient temperature by
raising it above the minimum set point
value.
G.
Compressor
protection
system cuts in.
Compressed air flow rate and
temperature too high and high ambient
temperature at the same time.
•
The compressor head and body are
very hot;
•
the compressor stops and tries to start
up again a few seconds later.
Shut the compressor down and adjust
compressed air flow rate and pressure
to within the drier limits.
Wait a few minutes before starting up
the compressor again
Check and replace the HP Pressure
switch if necessary.
Compressed air flow rate and
temperature too high and refrigerating
circuit empty.
•
The compressor head and body are
very hot;
•
the compressor stops and tries to
start up again a few seconds later.
Have the circuit checked for leaks by
a refrigeration technician, refill the
circuit.
Check and replace the HP Pressure
switch if necessary.
The HP Pressure switch has failed.
Ditto
Check and replace the HP Pressure
switch if necessary.
H.
Sensor
protection
system cuts in
The compressor has stopped the control
board display show 00 and the first digit
point is blinking.
The temperature sensor is not
connected or short circuited
