13. Troubleshooting
Problem
Possible cause
Remedy
Dosing pump not delivering or output
too low
Valves leaking or blocked
Clean the valves and vent the dosing pump.
See also "Start-up"
Tighten the screw connections.
Valves incorrectly installed
Reassemble the valves.
Ensure that the valve balls are located above the valve seats.
Suction valve or suction line leaking or blocked
Clean or seal the suction line.
Suction lift too high
- Set the dosing pump at the inlet.
- Install the pulsation damper on the suction side.
- Install a priming aid.
Viscosity too high
- Install spring-loaded valves.
- Increase the pipe diameter.
- Use the special dosing head.
>> Contact manufacturer
No stroke movement
Dosing pump set to zero stroke
Set the stroke length adjusting knob correctly.
Diaphragm return spring broken
Replace the spring.
Power supply interrupted
Switch on power supply.
Dosing pump delivery rate too high
Suction side pressure too high (pump siphoning)
Install a back-pressure valve on the discharge line.
Diaphragm cracks frequently
Diaphragm not screwed up to the end stop on the diaphragm rod
Screw a new diaphragm up to the end stop. On MB/ME 50...76,
the support plate must be clamped firmly between diaphragm
and diaphragm rod.
System back pressure too high (measured at discharge connec-
tion of dosing pump)
Inspect the system. Clean blocked injection nozzle. Install pulsa-
tion dampers to reduce pressure spikes if pipes are too long.
Check that safety valves are working (see installation example).
Media sediment in dosing head
Clean the dosing head.
Dosing pump very noisy
Roller bearing defective
Replace the roller bearing.
No oil in the gearing, or too little
Top up the oil as described in "Maintenance".
Motor hums and does not start.
Wrongly connected
Check electrical wiring.
Capacitor defective, wrong size or connected incorrectly
Connect the capacitor correctly or replace.
Pressure too high
Check the process.
Alarm states indicated by red LEDs on
the display
Level pre-alarm
Level main alarm
Internal error
Check the functions as described in section 8 (Encore
®
MB
operation).
Pump switches off by itself.
Pump inadvertently disconnected from power supply
Use only an external switch-off to switch the pump on/off. See
paragraph 7.4 and 8.2
If the problem cannot be solved with the above remedies, please return the dosing pump to the factory or contact our After-Sales Service for further assistance. Repairs will be carried out immediately.
39
Diaphragm Dosing Pump
Encore
®
MB/ME
Operating Instructions
CF.450.410.001.IM.1114
Summary of Contents for Encore MB
Page 3: ...3 Diaphragm Dosing Pump Encore MB ME Operating Instructions CF 450 410 001 IM 1114 ...
Page 48: ...48 Diaphragm Dosing Pump Encore MB ME Operating Instructions CF 450 410 001 IM 1114 ...
Page 50: ...19 Notes 50 Diaphragm Dosing Pump Encore MB ME Operating Instructions CF 450 410 001 IM 1114 ...
Page 51: ...51 Diaphragm Dosing Pump Encore MB ME Operating Instructions CF 450 410 001 IM 1114 ...
Page 52: ...Encore MB ME Diaphragm Dosing Pump MANUAL NO CF 450 410 001 IM 1114 CF 450 420 001 IM 1114 ...