Question 1 of 6
Intermediate

In addition to limiting the current draw from the mains during start-up of the pump, how does the soft-start functionality benefit operation?

Question 2 of 6
Intermediate

By how much does the supply voltage decrease before the motor contactor stops the pump?

Question 3 of 6
Intermediate

Where is domestic groundwater extraction typically relevant?

Question 4 of 6
Intermediate

How long did it take to replace the pump with a Grundfos SQ?

Question 5 of 6
Intermediate

Which protection features does the SQE have?

Question 6 of 6
Intermediate

Why is correct sizing of the submersible pump important?

Question 6 of 6
Intermediate

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1: In addition to limiting the current draw from the mains during start-up of the pump, how does the soft-start functionality benefit operation?
Soft start reduces over-pressure in your piping.
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1: In addition to limiting the current draw from the mains during start-up of the pump, how does the soft-start functionality benefit operation?
It reduces the occurrence of water hammer in the pipes and minimises wear during start-up.
1: In addition to limiting the current draw from the mains during start-up of the pump, how does the soft-start functionality benefit operation?
Soft start prevents the motor from getting warm.
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2: By how much does the supply voltage decrease before the motor contactor stops the pump?
More than 10 %
2: By how much does the supply voltage decrease before the motor contactor stops the pump?
More than 15 %
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2: By how much does the supply voltage decrease before the motor contactor stops the pump?
More than 20 %
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3: Where is domestic groundwater extraction typically relevant?
In big cities.
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3: Where is domestic groundwater extraction typically relevant?
In remote areas where it is too costly to extend the municipal water supply to just a few houses.
3: Where is domestic groundwater extraction typically relevant?
In smaller and medium sized towns.
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4: How long did it take to replace the pump with a Grundfos SQ?
30 minutes
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4: How long did it take to replace the pump with a Grundfos SQ?
60 minutes
4: How long did it take to replace the pump with a Grundfos SQ?
90 minutes
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5: Which protection features does the SQE have?
Voltage handling, soft start, dry-running protection and overload protection.
5: Which protection features does the SQE have?
Protection against the well running dry.
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5: Which protection features does the SQE have?
The SQE does not have any protection features.
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6: Why is correct sizing of the submersible pump important?
Because an undersized pump will not be able to deliver the required flow and pressure and an oversized pump reduces energy efficiency, which increases operational costs.
6: Why is correct sizing of the submersible pump important?
Because too small a pump will pump the well dry.
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6: Why is correct sizing of the submersible pump important?
Because too big a pump will ruin the taps due to too high pressure.
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