Danfoss VLT HVAC Basic Drive FC 101 Manual de usuario descargar pdf (Pagina 13)

VLT® HVAC drive allows you to rethink your compressor operation. Flexible compressor mode operation even above

nominal speed and high break away torque for

start-ups allow for better control and major

savings.

The VLT® HVAC Drive has been design-

ed to oﬀ er ﬂ exible, intelligent control

of scroll, screw and centrifugal com-

pressors, making it even easier to

optimize cooling capacity with con-

stant temperature and pressure levels

for water chillers, and other typical

compressor applications in HVAC.

Replace a cascade with

a single compressor

The VLT® HVAC Drive provides the

same level of ﬂ exibility with one large

compressor instead of a cascade

of 2 or 3 smaller compressors.

The HVAC Drive operates all

compressors at a far more re-

ﬁ ned range of speeds than

normal – even above

nominal speed – meaning

that one large compressor is

now enough.

Dedicated compressor features

Set point in temperature

The VLT® HVAC Drive calculates the

actual room temperature from the

pressure in the cooling media and

reﬁ nes compressor operation accord-

ingly – without the need for addition-

al software, sensors or controllers.

This calculation is also applicable to

the set point as well, so the desired

temperature is set via the Local

Control Panel – and not a pressure

value.

Fewer starts and stops

A maximum number of start/stop

cycles within a given period of time

can be set via the Local Control Panel.

Since start-up is the most critical part

of compressor operation (all parts of

the unit are under mechanical stress

before the system is suﬃ ciently lubric-

ated) this extends compressor

lifetime.

Quick start-up

To extend life even further, the VLT®

HVAC Drive opens a bypass valve and

lets the compresser start quickly

without load.

The VLT® HVAC Drive provides 130%

break away torque and can give 110%

torque for 60 seconds in normal ope-

ration. This torque demand would

normally require larger and more ex-

pensive drives.

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