ProMinent DULCODOS universal mini Assembly And Operating Instructions Manual page 32

Maintenance and Troubleshooting
Fault
Display on the pressure
manometer pulsates
Discharge line displays
strong vibrations or starts
"pulsating'
Suction line displays
strong vibrations or starts
"pulsating'
Fluid is leaking from the
backplate of the metering
pump
The table does not claim to be complete.
Further reasons for failure and detailed information on the causes of faults can be found in the operating
instructions for the individual components.
32
Possible cause
Back pressure too high at the injection
point
Injection point blocked
Voltage drop or failure
Cable for power supply is not correctly
connected
Control failure, no control signal
Cable for control is loose or incorrectly
connected
Stroke rate or stroke length set to "0"
Pump is set to standby mode or pause
Faulty operation of the pump/metering
system
Electrical connection malfunctioning
Pulsation damper pre-load is incorrect
Pressure peaks too high
Pressure peaks too high
Liquid end not tight
Remedy
Reduce back pressure or replace
pump with a higher capacity
Clean injection point
Reconnect the power supply
Ensure correct power supply through
measurement
Ensure correct control signal through
measurement
Check connector and, if required,
rewire the signal cable
Set the stroke rate / stroke length to
the desired value
Check the control or pause signal
Train operating staff
Check the contacts for corrosion and
secure fixing
Check the setting of the pulsation
damper
Retrofit pulsation damper if neces‐
sary
Check the setting of the pulsation
damper
Retrofit pulsation damper if neces‐
sary
Check the setting of the pulsation
damper
Retrofit pulsation damper if neces‐
sary
Tighten the screws on the dosing
head crosswise to the correct tight‐
ening torque
Replace diaphragm/sealing set