15 Problems and their removal
Operating manual for micro annular gear pumps mzr-7240
Last update: March 2019
Technical data subject to change without prior notice!
69
Disturbance
Cause
Solution
manufacturer.
17 The pump is noisy
Wearout of the pump or defective
components
Do not continue to operate the pump, return it
to the manufacturer for maintenance.
18 Lack of connection with the RS-232
interface
The pump is not connected.
Check the power supply 24 VDC.
Check the connection of the interface and the
null-modem cable. Change the cable if
necessary.
The drive control does not respond.
Interrupt the voltage supply for about 10 s,
connect the voltage supply again. Automatic
start of the integrated drive control
19 Overcurrent
Particles in the delivered liquid
Rinse the pump.
The pump operates with difficulty.
Dosing needle is damaged. Needle should be
cleansed, flushed or exchanged.
Tubing on the delivery side, dosing needle or
non-return valve are blocked. Cleanse, flush or
exchange the components.
Deposits inside the pump.
Flush the pump. If necessary return the pump
to the manufacturer.
20 Undervoltage
Voltage supply < 12 VDC
Check the power supply 24 VDC.
21 Overvoltage
Voltage supply > 28 VDC
Check the power supply 24 VDC. The drive
control may be damaged. Return the pump to
the manufacturer.
table 31
Problem shooting - causes and solutions.
!
If a disturbance that has not been mentioned in the above list, or that makes
the use of the micro annular gear pump unsafe appears, please stop the
operation of the pump without delay and contact the manufacturer.