Grundfos DMM 110, Инструкция по установке и эксплуатации

Страница: 13 / 126

13
9. Fault finding chart
10. Disposal
Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest GRUND-
FOS company or service workshop.
Fault Cause Remedy
Motor is running, but
the pump is not dosing. Valve blocked or leaking. Check and clean valves.
Valves incorrectly installed. Reinstall valves. Ensure that the valve balls
are positioned above the valve seats.
Suction valve or suction line leak-
ing or blocked. Clean and seal suction line.
No stroke movement. Return spring defective. Replace spring.
Check that counter-pressure and suction pres-
sure of pump are within the permissible range.
Pump dosing too little
or too much. Stroke length control knob incor-
rectly installed. Install the knob correctly.
Pump dosing too
much. Suction pressure too high. Install counter-pressure valve in discharge
line.
Pump dosing irregu-
larly. Valve blocked or leaking. Check and clean valves.
Frequent diaphragm
failures. Diaphragm not fastened properly to
the diaphragm rod. Install new diaphragm to ensure that the dia-
phragm is fastened properly.
Pressure surges at dosing strokes
too high. Install pulsation dampener.
Excessive counter-pressure. Check counter-pressure and adjustment of
counter-pressure valve, if any.
Pump too noisy. Defective bearing. Replace bearing.
No oil in gear box. Refill oil. Renew gear oil, if necessary.
Motor hums and does
not start. Wrong connection. Check electrical connection.
Defective capacitor (single-phase
pumps only). Check capacitor connection or replace it, if
necessary.
Excessive counter-pressure. Check discharge line for blocking.
Subject to alterations.