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VLT® No Flow Feature

No ﬂ ow based on motor

power and frequency

No-Flow Detection is based on the

measurement of power at specifi c

motor speeds. The drive monitors

actual power and motor frequency

and compares it to the calculated

no-fl ow power at specifi c speeds.

If the power measured at a specifi c

frequency is greater than the no-fl ow

power calculated by the drive, the

pump is producing fl ow. If the power

measured is less than the no-fl ow

power calculated by the drive, a

warning or alarm is generated to

notify the operator of the condition.

The perfect solution for

•

Intelligent control

•

HVAC system protection

•

Remote status reporting

The VLT® HVAC Drive provides a new No-Flow detection feature

for pump systems. This feature is useful for detecting conditions

where a pump is producing no ﬂ ow – a condition that can cause

pump damage if not detected and corrected.

To determine the no-fl ow power level

throughout the speed range, the

drive generates a power vs. frequency

curve that represents the no-fl ow

condition. This curve is generated by

the drive from two data points. These

power/frequency points can be

entered into the drive automatically

or manually.

Manual or Auto Set Up are available

The Auto Set Up automatically steps

the user through the commissioning

process, storing the data measured.

When the automatic set-up is selected

the output frequencies used are 50%

and 85% of maximum. Manual set-up

can be used when a diff erent pair of

frequencies is desired.

Features

Eliminates an external diff erential

pressure switch or fl ow meter

Eliminates wiring for external sensors

A warning or alarm can alert operator

of the problem

Programming is quick and easy with

pre-programmed software

Programming is quick and easy

The drive software makes program-

ming the No-Flow feature quick and

easy by choosing Pump Functions

and then No-Flow Function under the

Quick Menu.

Beneﬁ ts

Reduce installation and maintenance cost

Provides proper operation of equipment and

increases occupant comfort

Saves time and increases reliablity