ITC DOSTEC AC, Manual

Page: 59 / 64

59
Maintenance
PROBLEM CAUSE SOLUTION
Display off – No voltage – Check the input voltage with a
voltmeter
– The thermomagnetic circuit
breaker has tripped
– Check for short circuit
AL-1
– Input voltage too high – Check the input voltage with a
voltmeter
– Internal short circuit – Contact ITC technical service
– Motor phase failure – Check the wiring between the motor
and the electronic card.
AL-2
– High temperature. Additional
ventilation does not work
– Check the wiring of the additional
ventilation, and test it by connecting it
directly to a power source
AL-3
– The pump is working with
overpressure
– Check that the pressure in line is lower
than the maximum pressure of the unit.
– Discharge pipe too long – Shorten the discharge pipe or increase
the pipe diameter
Motor runs but pump
does not inject or
dosing is lower than
nominal
– Pump not primed – Prime the pump by injecting at zero
pressure.
– Dirty or damaged suction or
discharge valves
– Clean or change valves
– Dirty suction filter – Clean filter
– Air enters the suction pipe – Check tightness of connection points
– Cavitation in suction – Increase pipe diameter.
– Reduce the suction pipe length.
– Reduce speed by using a variator.
– Use a less viscous liquid.
Pump drips liquid
from bottom orifice of
cylinder
– Damaged seals – Change seals
– Damaged piston – Change piston
– Damaged gaskets – Change gaskets
Pump drips oil from
bottom orifice of
cylinder
– Damaged bellows – Change bellows
7.6. TROUBLESHOOTING: POSSIBLE CAUSE AND SOLUTION