Question 1 of 6
Intermediate

How many times higher than nominal speed does the motor current reach during the first milliseconds?

Question 2 of 6
Intermediate

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

Question 3 of 6
Intermediate

What is the most commonly used starting method for motors in 4” conventional pumps?

Question 4 of 6
Intermediate

Why must the pump unit be installed below the dynamic water table?

Question 5 of 6
Intermediate

How does the integrated dry-running protection work?

Question 6 of 6
Intermediate

Where is domestic groundwater extraction typically relevant?

Question 6 of 6
Intermediate

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1: How many times higher than nominal speed does the motor current reach during the first milliseconds?
Four times higher
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1: How many times higher than nominal speed does the motor current reach during the first milliseconds?
Six times higher
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1: How many times higher than nominal speed does the motor current reach during the first milliseconds?
Seven times higher
2: How long did it take to replace the pump with a Grundfos SQ?
30 minutes
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2: How long did it take to replace the pump with a Grundfos SQ?
60 minutes
2: How long did it take to replace the pump with a Grundfos SQ?
90 minutes
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3: What is the most commonly used starting method for motors in 4” conventional pumps?
Direct on line
3: What is the most commonly used starting method for motors in 4” conventional pumps?
Star delta starters
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3: What is the most commonly used starting method for motors in 4” conventional pumps?
Auto transformer
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4: Why must the pump unit be installed below the dynamic water table?
So you are sure to minimise your power bill.
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4: Why must the pump unit be installed below the dynamic water table?
To avoid the risk of dry-running during operation.
4: Why must the pump unit be installed below the dynamic water table?
To maintain a stable pressure in the system.
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5: How does the integrated dry-running protection work?
It automatically restarts 3 minutes after shut down.
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5: How does the integrated dry-running protection work?
It prevents sand from damaging the pump.
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5: How does the integrated dry-running protection work?
It automatically shuts down the pump if water shortage is detected.
6: Where is domestic groundwater extraction typically relevant?
In big cities.
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6: 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.
6: Where is domestic groundwater extraction typically relevant?
In smaller and medium sized towns.
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