Service Kits; Contaminated Pumps; Fault Finding; The Pump Does Not Start - Grundfos AP40-70 Montage- Und Betriebsanleitung

4. Fit both oil screws

8.6 Service kits

For details on available service kits, see the Grundfos
Product Center (GPC) at product-
selection.grundfos.com.

8.7 Contaminated pumps

The product is classified as contaminated, if it is used
for contagious or toxic liquid.
CAUTION
Biological hazard
Minor or moderate personal injury
‐
Flush the pump thoroughly with clean
water and rinse the pump parts after
dismantling.
Before returning the product for service, contact
Grundfos with details about the pumped liquid.
Otherwise, Grundfos can deny to service the product.

9. Fault finding

9.1 The pump does not start

Cause
Electricity supply interrupted – short circuit or
earth connection in the cable or motor windings.
Remedy
• Have the motor and wires checked by a
specialist and replaced, if necessary.
Cause
Fuses, motor protection switch and/or monitoring
devices are triggered.
Remedy
• Have a specialist inspect the connection and
correct them as necessary.
• Have the motor protection switch adjusted
according to the technical specifications and
reset monitoring equipment.
• Check that the impeller/propeller runs
smoothly.
• Clean it or free it as necessary.
Cause
The oil chamber seal probe (optional) has
interrupted the power circuit
Remedy
• See fault: Mechanical shaft seal leaks, sealing
chamber monitor reports fault and switches
the pump off.

9.2 The pump runs, but delivers no liquid

Cause
Outlet valve is closed or blocked.
Remedy
• Check the outlet valve and open and/ or clean
it, if necessary.
Cause
Non-return valve is blocked.
Remedy
• Clean the non-return valve.
Cause
There is air in the pump.
Remedy
• Vent the pump.
9.3 The pump starts, but the motor-
protective circuit breaker trips after a
short time
Cause
Low setting of the thermal relay in the motor-
protective circuit breaker.
Remedy
• Set the relay in accordance with the
specifications on the nameplate.
Cause
Increased power consumption due to large
voltage drop.
Remedy
• Measure the voltage between two motor
phases. Tolerance: - 10 %/+ 6 %. Re-establish
correct voltage supply.
Cause
The impeller is blocked by impurities. Increased
power consumption in all three phases.
Remedy
• Clean the impeller.
Cause
The impeller clearance is incorrect.
Remedy
• Dismantle and inspect hydraulic components
for wear, replace warn components if
necessary. The impeller clearance is not
adjustable.
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