Diaphragm Metering Pump MEMDOS E / DX
BW 1 04 02 / 8
Lutz-Jesco GmbH
Improved changes are always reserved without notice.
TYPE OF FAULT POSSIBLE CAUSE RECOMMENDED ACTION
Pump not delivering. Valves leaking. Clean and remove air from valves.
(See also startup of pump.)
Tighten screw connections.
Valves incorrectly installed. Reassemble valves. Ensure that the
valve balls of suction and discharge
valve are located above the valve
seats.
Suction filter, foot valve or Clean and seal suction line.
suction pipe leaking or
blocked.
No stroke movement. Return spring broken. Replace
spring.
Consider density of the chemical!
Suction lift too high.
Pump delivering too little Valves blocked or leaking. Clean and re-seal valves.
or irregularly.
Pump delivering too Pressure on suction side too Install backpressure valve in
much. high (pump siphoning). discharge line.
Frequent diaphragm. Diaphragm was not screwed Screw in new diaphragm as far
ruptures. into diaphragm rod as far as stop.
as stop.
Injection nozzle blocked. Clean injection nozzle; fit larger one,
if necessary.
Pressure peaks because Change line or install pulsation
metering line is too long dampener. For increased safety
or too narrow. install relief valve (see installation
example).
Pump very noisy. Roller bearing defective. Replace roller bearing.
No or little oil in gearbox. Refill oil, as described in
section "maintenance".
Motor hums and Wrong connection. Check electrical wiring.
doesn't start.
Capacitor defective, wrong Connect capacitor correctly or
size or incorrectly connected. replace.
Pressure too high. Check process.
Indication of alarm states Low level alarm signaling, Check functions as described in
by red LEDs near display. Low level main alarm, chapter 7 (MEMDOS DX control unit).
internal error.
9. Troubleshooting
If the problem cannot be corrected on the basis of the above data, return the pump to the factory or contact
our Techical Sales Service for further measures. Repairs will be carried out immediately.
