If you have ever had to make a serious job of saving energy, it is now. Not only because of climate changes and the reduction of CO2 emissions, but of course also because costs have to be saved as much as possible.

Using Danfoss variable speed drives makes it relatively easy to reduce the power consumption in your electric drive systems. In most cases you are able to recover the investment costs in a short period of time.

Full speed

In a lot of applications electric motors are still directly connected to the mains supply and dampening or throttling is commonly used to control pump or fan throughput.

This can be compared with driving your car at full speed and at the same time controlling your speed by hitting the brake. It is clear a lot of energy is lost this way.

By using a VLT® variable speed drive you are able to reduce high starting currents and the power in the electric drive system can continuously be adjusted to the need. This gives you maximum performance combined with minimal energy consumption.

Energy efficient

VLT® variable speed drives have a very good energy efficiency of better than 98%. This means that less than 2% of the power is lost in the drive. As a result of this VLT® drives produce less heat. This also means that less energy is needed to cool the drive or the space where the drive is installed.

Pumps and fans

In all electric drive systems VLT® drives help you reduce the energy consumption but driving pumps and fans gives you the best possible energy savings. This is because in these variable torque applications the ratio between rotation speed and power consump¬tion is a factor 3. Driving pumps and fans at 10% less speed means more than 25% less energy consumption. 20% speed reduction saves almost 50% in energy. Thus relatively small reduc¬tions in speed already make you save a lot of energy.

Total Cost of Ownership

The Total Cost of Ownership for electric drive systems is not only limited to the purchase costs. You also have to take into account installation costs, maintenance costs and the costs for dismantling the installation after its lifecycle.

The biggest impact on the Total Cost of Ownership however is the energy costs. The energy efficiency of the installation therefore plays a very important role in the total costs. Saving energy makes you save money right from the start. Using a VLT® frequency drives will reduce costs even more.

Other savings

By adjusting the power of an electric drive system to the actual need saves a lot of energy.

But there are more advantages:
• reducing wear
• improving reliability
• less maintenance
• longer life time
• less unwanted stops
• improving work environment
All these advantages represent a value and all have a positive effect on the Total Cost of Ownership. Therefore you save a lot more costs than only energy costs.

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