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