Drives for pumps in commercial buildings

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Drives for pumps in commercial buildings

Optimize comfort, reliability and energy efficiency

With multiple pump-dedicated control features, intelligent protection capability and sensorless pump control, Danfoss AC drives optimize comfort and energy efficiency and protect the drive, the motor and the equipment in the system. They also ensure optimized liquid supply in the event of leakage or a broken pipe. Dedicated features include:

Embedded multi-pump controller

The Pump Cascade Controller distributes operation hours evenly across all pumps. Wear and tear on individual pumps is therefore reduced to a minimum, extending their lifetime expectancy and reliability considerably.

Dry pump protection and end of curve detection

If the pump runs without creating the desired pressure, the drive sets off an alarm or performs another pre-programmed action. This happens, for example, when a well runs dry or a pipe leaks.

Auto tuning of PI controllers

Auto tuning enables the drive to monitor how the system reacts to corrections made by the drive constantly. The drive learns from it and calculates the P and I values, so precise and stable operation is restored quickly.

Flow compensation

A pressure sensor mounted close to the pump provides a reference point that enables pressure to be kept constant at the discharge end of the system. The drive constantly adjusts the pressure reference to follow the system curve. This method both saves energy and reduces installation costs.

No/low flow detection and sleep mode

In situations with low or no flow, the drive enters sleep mode to conserve energy. When the pressure falls below the predefined set-point, the drive starts automatically. Compared to continuous operation, this method reduces energy costs and equipment wear and helps extend the lifetime of the application.

Pipe fill mode

Useful in all applications where controlled pipe filling is essential, such as water supply systems. Controlled (closed loop) filling of pipes prevents water hammering, bursting water pipes or blowing off sprinkler heads. Pipe fill mode can be used in both vertical and horizontal pipe systems.

Initial/final ramp

The initial ramp provides fast acceleration of pumps to minimum speed, from where the normal ramp takes over. This prevents damage to the thrust bearings on the pump. The final ramp decelerates pumps from the minimum speed to stop.

Flow confirmation

The flow confirmation monitor protects equipment from unexpected flow stoppage. The monitor communicates on an ongoing basis with an external device such as a valve or flow switch. If the signal from the external device times out, the monitor trips the AC drive.

Pre/post lubrication

Some machines require lubrication of their mechanical parts before and during operation to prevent damage and reduce wear. During lubrication, certain equipment must remain active, for example exhaust fans. To achieve this, the Pre Lube feature supports a signal to an external device to perform a specific action for a user-defined time period. Configurations available: “Pre Lube Only”, “Pre & Running” and “Pre & Running & Post”.

Freely programmable texts

This function supports versatile adaptation to the application. Use freely programmable text messages, based on internal or external events, for information, warnings or alerts. The function also supports actions based on events, for example initiation of a ramp down triggered by a valve opening.

Advanced minimum speed monitor

Submersible pumps can suffer from insufficient cooling and lubrication when pump speed is too low. The advanced minimum speed monitor protects the pump by monitoring and adjusting the trip speed to reduce wear and tear. Downtime for maintenance is minimized, with no need for external monitoring equipment.

Check valve ramp

The check valve ramp prevents water hammering when stopping the pump, by ensuring slow pump speed ramp down just as the check valve ball is almost shut.

Sensorless pump control

Sensorless Control is a distribution pump control method which infers the average HVAC system heating or cooling demand from the hydraulic system resistance, and then adjusts the pump(s) speed to balance satisfying that demand with minimizing the energy used. Sensorless pump curves are embedded in the drive.

Equinix server rooms – Totally reliable air conditioning

Equinix server rooms – Totally reliable air conditioning

VLT® HVAC Drive ensures that maximal internet uptime is also cost effective, via energy-efficient heat extraction in server rooms


  • DrivePro® Life Cycle Services

    Every AC drive application is different. DrivePro® Life Cycle Services is a collection of tailor-made products designed around your needs.

    From optimized spare part packages to condition-monitoring solutions, customize our products to support your business through the different stages of your AC drive’s life cycle.

  • Enhanced VLT® HVAC Drive FC 102
    VLT® HVAC Drive FC 102

    This tough and savvy FC102 drive enhances pump and fan applications in building management systems, and runs outdoors in most climates.

  • VLT® AQUA Drive FC 202
    VLT® AQUA Drive FC 202

    VLT® AQUA Drive FC 202 controls all types of pumps and comes equipped with a cascade controller.

  • VACON® 100 FLOW
    VACON® 100 FLOW

    Dedicated functionality that improves flow control and saves energy in industrial pump and fan applications.

Case stories

  • Cool tech for ice hockey ensures perfect match conditions
    Cool tech for ice hockey ensures perfect match conditions

    When talking about ice hockey arenas, whether you are a player or a spectator, you’re always on the winning team with Danfoss.

  • Equinix server rooms – Totally reliable air conditioning
    Equinix server rooms – Totally reliable air conditioning

    Equinix connects the world’s leading businesses to their customers, employees and partners inside the most interconnected data centers.

  • Kolmeks integrates VACON® drives into VS in-line pump family
    Kolmeks integrates VACON® drives into VS in-line pump family

    The joint development project between Kolmeks and Danfoss Drives units in China, Italy and Finland proved to be highly successful.

  • World’s greenest hotel uses 60% less electricity
    World’s greenest hotel uses 60% less electricity

    VLT® HVAC Drive helps Crowne Plaza Copenhagen Towers hotel optimize energy efficiency and cost effectiveness.

  • 70% energy savings in central heating
    70% energy savings in central heating

    A central heating system that uses 70% less energy now, than in 2007? Whilst maintaining full comfort and process performance? That is the impressive result achieved at Danfoss’ industrial site in Nordborg, Denmark.

  • Danfoss and Inertech change future of data center cooling
    Danfoss and Inertech change future of data center cooling

    New solution enables expansion without compromising security, consumes less energy and water, and costs less than traditional chiller plant.

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