Grundfos SMART Digital XL DDA 120-7, Инструкция по установке и эксплуатации

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9.1.2 General faults
10. Disposal
This product or parts of it must be disposed of in an
environmentally sound way. Use appropriate waste
collection services. If this is not possible, contact the
nearest Grundfos company or service workshop.
See also end-of-life information at
www.grundfos.com/product-recycling.
Fault Possible cause Possible remedy
Dosing flow too high
Inlet pressure greater than
backpressure
Install additional spring-loaded valve (approx. 2
bar) on the outlet side. Check settings.
Increase pressure differential.
Incorrect calibration
Calibrate the pump. See section 6.5 Calibrating
the pump .
No dosing flow or
dosing flow too low
Air in dosing head Deaerate the pump.
Faulty diaphragm
Change the diaphragm. See section 8.4 Perform
service .
Leakage/fracture in lines Check and repair lines.
Valves leaking or blocked Check and clean valves.
Valves installed incorrectly
Check that the arrow on the valve housing is
pointing in the direction of flow. Check whether all
O-rings are installed correctly.
Blocked inlet line Clean inlet line/install strainer.
Suction lift too high
Reduce suction lift.
Install priming aid.
Enable "
SlowMode
". See section 7.6
SlowMode
.
Viscosity too high
Enable "
SlowMode
". See section 7.6
SlowMode
.
Use lines with larger diameter.
Install spring-loaded inlet and outlet valve.
Faulty calibration
Calibrate the pump. See section 6.5 Calibrating
the pump .
Deaeration valve open Close the deaeration valve.
Irregular dosing
Valves leaking or blocked
Tighten up valves, replace valves if necessary.
See section
8.4 Perform service .
Backpressure fluctuations
Keep backpressure constant.
Activate "
AutoFlowAdapt
" (only DDA-FCM).
Liquid escaping from
the drain opening on
the dosing head
Faulty diaphragm
Immediately separate the pump from the power
supply!
Observe section
8. Service and especially section
8.6 Diaphragm leakage .
Liquid escaping
Dosing head screws not
tightened Tighten up screws. See section 5.2 Hydraulic
connection .
Valves not tightened
Tighten up valves/union nuts. See section
5.2 Hydraulic connection .
Pump not sucking in
Suction lift too high
Reduce suction lift; if necessary, provide positive
inlet pressure.
Backpressure too high Open the deaeration valve.
Soiled valves
Flush system, replace valves if necessary. See
section
8.4 Perform service .