Pump with speed controller responsive to temperature
First Claim
1. Pump unit, in lar for heating and cooling installations, the speed of which can be altered by changing the operating frequency of a frequency converter feeding the electric motor, and having a device which protects the unit from thermal overload, the pump unit and frequency converter forming a structural unit, characterised in that when a parameter characterising the overload state is reached, the motor speed n is reduced to a motor speed n'"'"' by driving the frequency converter, wherein the relationship n'"'"'≧
- 0.5 n applies.
1 Assignment
0 Petitions
Accused Products
Abstract
The pump unit is provided, in particular for heating and cooling installations. The speed of the pump unit may be altered by changing the operating frequency of a frequency converter feeding the electric motor and which forms a structural unit with the pump unit. As soon as the pump unit has reached a parameter characterizing the thermal overload of the same, the frequency converter is controlled in a manner so as to reduce the speed, the reduced speed n'"'"' being greater or equal to half the normal speed n.
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Citations
9 Claims
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1. Pump unit, in lar for heating and cooling installations, the speed of which can be altered by changing the operating frequency of a frequency converter feeding the electric motor, and having a device which protects the unit from thermal overload, the pump unit and frequency converter forming a structural unit, characterised in that when a parameter characterising the overload state is reached, the motor speed n is reduced to a motor speed n'"'"' by driving the frequency converter, wherein the relationship n'"'"'≧
- 0.5 n applies.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification