ProMinent alpha ALPc 0230, Operating Instructions Manual, Page: 38 / 52

12.1 Faults and troubleshooting
Fault description Cause Remedy Personnel
Pump does not
prime in spite of
full stroke motion
and bleeding.
Minor crystalline
deposits on the ball
seat due to the valves
drying out
Take suction hose out of the
storage tank and thoroughly flush
out the liquid end
Technical
personnel
Major crystalline
deposits on the ball
seat due to the valves
drying out
Dismantle and clean the valves. Technical
personnel
Fluid is escaping
from the backplate.
The screws in the
dosing head are too
loose
Tighten the screws in the dosing
head crosswise - refer to "Repair"
for tightening torque.
Instructed
personnel
The diaphragm is dam‐
aged.
Replace the diaphragm - refer to
"Repair".
Technical
personnel
The pump auto‐
matically switches
off during
metering.
The circuit breaker has
switched off the over‐
heated motor as the
back pressure is too
high.
Disconnect the pump from the
mains power supply.
Check whether a shut-off device is
closed or there is a blockage on
the discharge side or reduce the
back pressure.
Re-connect the metering pump to
the mains voltage. The circuit
breaker switches the pump on
again once the motor has cooled
down.
Instructed
personnel
The circuit breaker has
switched off the motor
due to the motor over‐
heating, as the intake
or drain openings for
the motor cooling air
are blocked.
Disconnect the pump from the
mains power supply.
Examine and clean the intake and
drain opening for the motor
cooling air to the bottom of the
pump.
Re-connect the metering pump to
the mains voltage. The circuit
breaker switches the pump on
again once the motor has cooled
down.
Technical
personnel
Troubleshooting
38