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

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

Question 3 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 4 of 6
Intermediate

Why is correct sizing of the submersible pump important?

Question 5 of 6
Intermediate

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

Question 6 of 6
Intermediate

What is the benefit of a slow increase in speed?

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: 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: 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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3: 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.
3: 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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4: 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.
4: Why is correct sizing of the submersible pump important?
Because too small a pump will pump the well dry.
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4: 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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5: What is the most commonly used starting method for motors in 4” conventional pumps?
Direct on line
5: What is the most commonly used starting method for motors in 4” conventional pumps?
Star delta starters
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5: What is the most commonly used starting method for motors in 4” conventional pumps?
Auto transformer
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6: What is the benefit of a slow increase in speed?
It keeps the motor current low
6: What is the benefit of a slow increase in speed?
It keeps pump movements at a minimum
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6: What is the benefit of a slow increase in speed?
It removes the need for motor contactors
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