Protections And Alarms - Nastec 4HS Installation And Operating Manual

11. Protections and alarms

Anytime a protection occurs a blinking message is displayed together an acoustic alarm; on STATUS on INITIAL VIEW
the protection is displayed; by pressing STOP button (only and exclusively from the this position of STATUS on
INITIAL VIEW) is possible to try to reset the alarm; if CM does not reset the alarm it is displayed again together an
acoustic sound.
ALARM MESSAGE
OVERCURRENT MOT.
UNDERVOLTAGE
OVERVOLTAGE
OVER TEMP. INV.
NO WATER
(DRY RUN COSPHI)
PRESS. SENS. FAULT
FLOW SENS. FAULT
TEMP. SENS. FAULT
ALARM DESCRIPTION
Motor overload: input
current of the motor is
higher the rated motor
current set as parameters
Supply voltage too low
Supply voltage too high
Inverter over temperature
Motor cosphi is lower than
the set value of dry running
cosphi
Pressure sensor error
Flow sensor error
Temperature sensor error
POSSIBLE SOLUTION

Check other possible causes about the
over current
Check possible causes of undervoltage
Check possible causes of overvoltage

Make sure than ambient temperature
is less than 35 °C

Check if the pump is primed
If pumps cosphi is lower than the set dry
running cosphi for at least 2 seconds, CM stops
the pump. CM tries to run the pumps every
10, 20, 40, 80, 160 minutes and then the pump
is definitely stopped with NOWATER indication.
WARNING: if dry running protection occurs, CM
tries to start the pump automatically without
any advice.
Be sure to have cut power supply before to
make maintenance.

Check the pressure transducer

Check the wiring of pressure transducer
(signal into AN1 or AN2)

Check the flow transducer

Check the wiring of transducer (AN3)

Check the temperature transducer

Check the wiring of transducer (AN3)
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