CAUTION!
Warning of feed chemical spraying around
Feed chemical can spray out of the hydraulic components if
they are manipulated or opened due to pressure in the liquid
end and adjacent parts of the system.
– Disconnect the pump from the mains power supply and
ensure that it cannot be switched on again by unauthor‐
ised persons.
– Depressurise the system before commencing any work
on hydraulic parts.
Fault description Cause Remedy Personnel
Pump does not prime in spite of
full stroke motion and bleeding.
The valves are dirty or
worn.
Repair the valves - see chapter enti‐
tled "Repair".
Technical per‐
sonnel
The feed chemical has par‐
ticles larger than 0.3 mm.
Install a suitable filter in the suction
line.
Technical per‐
sonnel
Pump does not reach high pres‐
sure rates.
The valves are dirty or
worn.
Repair the valves - see chapter enti‐
tled "Repair".
Technical per‐
sonnel
The motor is wired incor‐
rectly.
1. Check the mains voltage and
mains frequency.
2. Wire the motor correctly.
Electrician
The mains voltage has
failed.
Eliminate the cause. Electrician
Fluid is escaping from the back‐
plate.
The dosing head screws
are no longer tight enough.
Tighten the screws crosswise to the
specified tightening torque.
Technical per‐
sonnel
The diaphragm leaks.** Replace the diaphragm - refer to the
"Repair" chapter.
Technical per‐
sonnel
Large leaks occur at the relief
valve.
The ball or ball seat are
dirty or worn.
Clean or replace the ball and ball
seat.
Technical per‐
sonnel
The diaphragm rupture sensor
has triggered.
The operating diaphragm
has ruptured.**
Replace the diaphragm - refer to the
"Repair" chapter.
Technical per‐
sonnel
The drive motor is very hot. The discharge line is seri‐
ously constricted.
Rectify any constriction of the dis‐
charge line.
Technical per‐
sonnel
All other faults. Other causes. Call the ProMinent customer serv‐
ices.
* If necessary use the cross-section drawing of the integral relief valve in
the "Functional Description" chapter.
WARNING!
Warning of eye injuries
When opening the relief valve, a spring under high tension
can jump out.
– Wear protective glasses.
Tasks
Troubleshooting
41
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