Operating instructions

11 Troubleshooting
WARNING!
Warning about personal and material damage
EX pumps only: When operating in EX areas, certain sub‐
jects must be observed.
– The chapter "Important supplements for metering pumps
in EX zones" of the "General Operating Instructions on
ProMinent
®
Motor-Driven Metering Pumps and Hydraulic
Accessories" must be observed in all cases.
WARNING!
Danger of an electric shock
Personnel working on electrical parts can be electrocuted if
all electrical lines carrying current have not been discon‐
nected.
– Disconnect the supply cable before working on the motor
and prevent it from being reconnected accidentally.
– Any separately driven fans, servo motors, speed control‐
lers or diaphragm rupture sensors fitted should also be
disconnected.
– Check that the supply cables are de-energised.
WARNING!
Warning of hazardous or unknown feed chemical
Should a hazardous or unknown feed chemical be used, it
may escape from the hydraulic components when working
on the pump.
– Take appropriate protective measures before working on
the pump (protective eyewear, protective gloves, ...).
Read the safety data sheet on the feed chemical.
– Drain and flush the liquid end before working on the
pump.
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 3 mm.
Install a suitable filter in the suction
line.
Technical per‐
sonnel
Pump does not reach high
pressure rates.
The valves are dirty or
worn.
Repair the valves - see chapter enti‐
tled "Repair".
Technical per‐
sonnel
Safety information
Tasks
Troubleshooting
38