10 Problems and their removal
Operation manual mzr-2961, mzr-4661
36
Technical data subject to change without prior notice!
Last update: April 2018
Disturbance
Cause
Solution
needle
tubing or the needle.
Air bubbles in the liquid delivery system
(tubing, valves)
Fill in the pump and the liquid delivery system
with liquid.
6 Dosage volume does not
correspond to the desired values.
Air bubbles in the liquid delivery system
(tubing, valves ,...) and the pump
Vent the liquid delivery system and check for
untight fluid connections.
Pump shows cavitation.
Too long or too narrow intake tubing.
Shorten the intake tubing or change the
position of the pump.
Polluted or too small filter
Change the filter to a new or bigger one.
The non-return valve does not open.
Rinse the non-return valve.
7 Speed of the pump cannot be
adjusted.
Defective electric installation
Check the electric installation for correct
cable configuration and loose contacts.
Defective drive control
Return the drive control unit to the
manufacturer.
Encoder cable disconnected
The motor works at high speed. Check the
installation, return the pump to the
manufacturer for checkup.
8 Liquid drops from the dosing
needle.
The non-return valve does not close.
Rinse the non-return valve.
Too high pressure on the primary liquid
tank
Stop the delivery of compressed air on the
primary liquid tank.
The liquid tank is at a higher level than the
dosing needle.
Place the liquid tank at the same or slightly
lower level as the pump.
9 Liquid leaks out of the sealing
module.
Too high pressure on the sealing liquid
supply cartridge or defective sealing
Stop pressurizing the sealing liquid supply
cartridge. If needed return the pump to the
manufacturer.
10 Dosage volume decreases with
time.
Polluted filter
Exchange the filter.
Deposits in the pump
Flush the pump or return it to the
manufacturer for dismantling and cleaning.
The pump is worn after a long operating
period or after use with abrasive liquids.
New definition of the calibration factor of the
pump, by modifying the pump characteristics
graph necessary.
11 Leakage from the pump
The sealing does not function correctly.
Return the pump to the manufacturer.
12 Leakage from the coupling
assembly
Defective shaft seal
Return the pump to the manufacturer in
order to change the shaft sealing.
13 Leakage from the fluid connections Untight locking rings
Exchange or tighten the fluid connections,
exchange the fluid connection.
14 Air bubbles on the delivery side.
Loose fluid connections (particularly on the
induction (suction) side)
Check and tighten the fluid connections.
The shaft seal is untight or worn.
Return the pump to the manufacturer.
15 The error status of the pump cannot
be retrieved.
No connection with the pump
Check the supplied voltage.
Check the connection of the interface with
the null-modem cable. Replace the cable if
needed.
The motor control unit does not respond.
Turn off the voltage supply for a short time,
then turn it on again. Start the pump
automatically with the integrated control
unit.
16 Minimal leakage during standstill
No error, cause relative to the operating
principle
Use a non-return valve.
Place the liquid tank at the same or slightly
lower level as the pump.
17 Excess temperature
The surface of the pump is hot.
Clean the surface of the pump, rinse the
pump.
The pump operates with difficulty.
The pump should be flushed.
Particles in the delivered liquid or deposits
in the pump
The operation of the pump should
immediately be stopped! Return the pump to
