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Low Service Costs / Total Cost of Ownership

- energy costs constitute the largest share
Crucial to the energy cost is not the energy requirements of the component, but those of the entire
system.

More about Optimum System Efficiency
 
In addition to the energy costs, the costs of installation, maintenance and subsequent replacement
are relevant to the operator. Here, the lifetime of motor bearings play a major role. If the
bearings are worn, they must be replaced. For the three-phase induction motors (TPIM) in lower
power ranges the entire motor is typically replaced, since this is cheaper than exchanging the
bearings.
 
This practice may cause problems, especially in highly integrated systems such as the so-called EC
fans. According to the manufacturer the lifetime of an EC fan often corresponds to the lifetime of
the bearings. Depending on the effort required for the bearings the entire fan will need to be
replaced. This includes both the electronics and the fan, as it is a prerequisite for a cost-favourable
replacement that an identical fan is available. Due to the fact that the dimensions are not standardized, replacement with a fan from a different manufacturer is only possible with design changes.
 
In the EC+ concept, the user only has to replace the motor. Only after reaching the lifetime of the
second bearing set, must he take the failure of the frequency converter into consideration.
 
Due to the fact that the motors are not specially made, the operator can include them in an existing
replacement motor concept. And if it is possible – as with the VLT® HVAC Drive – to operate both PM
motors and TPIM, the operator may for a short time use a TPIM instead of a PM motor.
 
If an operator decides to build a stock of fan wheels, he can coordinate with the fan supplier which
standard fan wheels cover most of his applications.
 
For the applied frequency converter the operator does not need to store a converter for each power
size. For example, a VLT® HVAC Drive can also operate motors two to three levels below its rated
power. This means that if an unit faults a larger drive can be used provisionally, until a replacement
drive has arrived.
Danfoss VLT drives energy saving ECplus

Danfoss EC+ Concept

Systematic energy saving

Increase your overall system efficiency, achieve a higher energy class certification and save costs with the Danfoss EC+ concept.