ProMinent Sigma 3 Basic Operating Instructions Manual page 63

Tasks
Fault description
Pump does not prime in spite of
full stroke motion and bleeding.
Pump does not reach high pres‐
sure rates.
Fluid is escaping from the back‐
plate.
Large leaks occur at the relief
valve.
The diaphragm rupture sensor
has triggered.
WARNING!
Only motors with a frequency converter: Danger of elec‐
tric shock
The danger of electric shock remains for 3 minutes after
the mains voltage has been switched off on conducting
parts of the motor with an integrated frequency converter
and on the lines themselves.
–
CAUTION!
Only motors with a frequency converter: The motor can
be damaged
The input current limiter could be damaged if a motor
with an integrated frequency converter is restarted within
3 minutes of the mains voltage being switched off.
–
CAUTION!
Warning of feed chemical spraying around
Feed chemical can spray out of the hydraulic compo‐
nents if they are manipulated or opened due to pressure
in the liquid end and adjacent parts of the system.
–
–
Cause
The valves are dirty or
worn.
The feed chemical has par‐
ticles larger than 0.3 mm.
The valves are dirty or
worn.
The motor is wired incor‐
rectly.
The mains voltage has
failed.
The dosing head screws
are no longer tight enough.
The diaphragm leaks.**
The ball or ball seat are
dirty or worn.
The operating diaphragm
has ruptured.**
After switching off, allow the device to stand for 3
minutes before opening the terminal box.
After switching off, allow the device to stand for at
least 3 minutes before restarting.
Disconnect the pump from the mains power supply
and ensure that it cannot be switched on again by
unauthorised persons.
Depressurise the system before commencing any
work on hydraulic parts.
Remedy
Repair the valves - see chapter
entitled "Repair".
Install a suitable filter in the suction
line.
Repair the valves - see chapter
entitled "Repair".
1. Check the mains voltage and
mains frequency.
2. Wire the motor correctly.
Eliminate the cause.
Tighten the screws crosswise to
the specified tightening torque.
Replace the diaphragm - refer to
the "Repair" chapter.
Clean or replace the ball and ball
seat.*
Replace the diaphragm - refer to
the "Repair" chapter.
Troubleshooting
Personnel
Technical per‐
sonnel
Technical per‐
sonnel
Technical per‐
sonnel
Electrician
Electrician
Technical per‐
sonnel
Technical per‐
sonnel
Technical per‐
sonnel
Technical per‐
sonnel
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