10 Problems and their removal
Operation manual mzr-2961, mzr-4661
Last update: April 2018
Technical data subject to change without prior notice!
35
10
Problems and their removal
Disturbance
Cause
Solution
1 The pump does not start operation. No power supply
Check the power supply.
2 The pump does not deliver any
liquid.
No liquid in the primary tank.
Fill the recipient/tank with liquid.
Presence of air or gas in the pump
The pump cannot run dry against the system
pressure. Fill in the pump at no pressure or at
reduced system pressure.
Malfunction of the liquid supply system
(such as in the delivery tube or hose, the
needle or external non-return valve)
Check the components for possible
disturbances to be eliminated. Cleanse the
accessories if needed.
Failure of the electric installation.
Check the electric installation for the correct
cable configuration, loose contacts, etc.
The pump did not receive the start signal or
start conditions are not fulfilled.
Check if the start conditions have been
fulfilled start signals (PLC, start input) and the
programming.
Read the operating manual for the motor
control unit.
3 The pump does not start to operate. The pump does not take in the liquid.
The tubing on the suction side is too long or
has a too small internal diameter (a too low
NPSHA value).
The tubing or the fluid connection on the
suction side are not tight. Please check the
intake connection and the tubing.
Air bubbles in the system
(tubes, valves, ...)
If the viscosity of the liquid is too high, apply
pressure on the suction side.
Check the pressure exerted on the primary
liquid tank.
An external non-return valve does not open.
Check the non-return valves.
Submit the non-return valve to a higher
pressure, so that the pump may fill in.
4 The motor turns, but the pump
does not operate.
No liquid in the pump
Fill the pump with liquid.
Air bubbles in the liquid supply system
(tubing, valves, ...)
Fill the pump and the liquid supply system
with liquid.
The non-return valve does not open.
Rinse the non-return valve.
Blocked delivery tubing or needle
Cleanse, flush or exchange the delivery
tubing or dosage needle.
The coupling between the motor and the
pump is out of position.
Return the pump to the manufacturer.
The pump shaft is broken.
Return the pump to the manufacturer.
5 The pump is filled with liquid, but
does not pump it.
Adapt the motor current of the control.
Contact the manufacturer of the pump.
Presence of particles in the delivered liquid
or blockage of the pump
Check the motor error status with the Motion
Manager software.
Try to liberate the pump by making it operate
in a reverse direction for 1 s with
- 1000 rpm.
Flush the pump with a syringe.
Return the pump to the manufacturer for
cleansing. Use a filter, flush the liquid delivery
system.
The non-return valve does not open.
Rinse the non-return valve.
Blockage of the delivery tubing or the
Cleanse, flush or exchange the delivery
