Enclosures – IP20/chassis, IP21/NEMA 1,IP55/NEMA 12 and IP66/NEMA 4X
Dedicated HVAC features Auto tuning of the PI controllers – With auto tuning of the PI controllers, the drive monitors how thesystem reacts on corrections made by the drive – & learns from it, so that precise and stable operation is achieved quickly.
Automatic Energy Optimization – The standard feature AEO provides optimized motor magnetization at all speeds and loads. This increases energy efficiency by 5-15% for partial loads.
Energy monitoring – The VLT® HVAC Drive provides a complete range of energy consumption information, which helps identify low efficiency components in the HVAC system.
Automated Resonance Monitoring – The drive can easily be set to avoid frequency bands at which connected fans create resonances in the ventilation system. This reduces installation time and system wear.
Fan Belt Monitoring – From the relation between current and speed, the VLT® HVAC Drive is able to reliably recognize a broken belt.
Fire Override Mode – In Fire Override Mode, the VLT® HVAC Drive will not react to control signals, warnings or alarms. It will continue reliable operation as long as possible and run until it is eventually destroyed itself to ensure that fire escapes remain free of smoke
Set point in temperature – The VLT® HVAC Drive calculates the actual room temperature from the pressure in the cooling media and refines compressor operation accordingly without the need for additional software, sensors or controllers. This feature allows less expensive pressure sensors to be used.
Pipe Fill Mode – Enables controlled (closed loop) filling of pipes. Prevents water hammering, bursting water pipes or blowing off sprinkler heads.
End of Pump Curve detects breaks and leakage – The feature detects breaks and leakage. End of curve triggers an alarm, shuts off the pump, or performs another userdefined action.
Dry Pump Protection lowers maintenance costs – The VLT® HVAC Drive constantly evaluates the condition of the pump, based on internal frequency/power measurements.
Standard cascade controller – The built-in cascade controller controls up to three pumps with fixed lead pump.
Motor Alternation – This built-in logic controls alternation between two pumps in duty/stand-by applications. Motion of the stand-by pump prevents sticking of the pump. An internal timer assures equal usage of the pumps.
Flow compensation – The flow compensation feature reduces the pressure set point according to the flow – which saves energy.
Initial/Final Ramp – The initial ramp provides fast acceleration of pumps to minimum speed, from where the normal ramp takes over. This prevents damage on thrust and bearings. Sensorless Pressure or Flow Control.
Safety – The VLT® HVAC Drive can optionally be delivered with the safe stop functionality suitable for category 3 installations according to EN 954-1. This feature prevents the drive from starting unintended.

Accessories – A wide selection of accessories is available for the VLT® HVAC Drive to suit your needs. For further details see the Operation Instructions.
Options – Options for bus communication, user programs, etc., are delivered ready for plug and play.
Display options -Local Control Panel LCP (graphical and numerical)Cable for LCP, 3 m [9.8 ft] Remote-mounting kit for Local Control Panel (LCP)
Application options – External 24 V supply card
Serial Communication Options – Profibus (MCA-101) DeviceNet (MCA-104) BACnet (MCA-109) Lonworks (MCA-108)
ProfiNET (MCA-120) Ethernet IP (MCA-121) Modbus TCP (MCA-122)

I/O options
General Purpose I/O (MCB 101) Relay Option (MCB 105).
External 24VDC supply option (MCB-107).
Analogue I/O w. real time clock backup (MCB-109).
ATEX-PTC Thermistor Card (MCB 112)

Filters – Harmonic Filter (AHF 005/010 MCE) Sine-Wave Filters (MCC 101) dU/dt filter (MCC 102)
Other accessories – IP21/NEMA1 KitUSB connection cable to PCHarmonic Filter cable to PC