Danfoss VLT AHF 005 Design Guide

Comparators
Comparators are used for comparing continuous variables
(output frequency, output current, analog input, and so on)
to xed preset values.
Par. 13-11
Comparator Operator
=
TRUE longer than.
. . .
. . .
Par. 13-10
Comparator Operand
Par. 13-12
Comparator Value
130BB672.10
Illustration 5.5 Comparators
Logic rules
Combine up to 3 boolean inputs (TRUE/FALSE inputs) from
timers, comparators, digital inputs, status bits, and events
using the logical operators AND, OR, and NOT.
. . .
. . .
. . .
. . .
Par. 13-43
Logic Rule Operator 2
Par. 13-41
Logic Rule Operator 1
Par. 13-40
Logic Rule Boolean 1
Par. 13-42
Logic Rule Boolean 2
Par. 13-44
Logic Rule Boolean 3
130BB673.10
Illustration 5.6 Logic Rules
5.2.12 Safe Torque O
The Safe Torque O (STO) function is used to stop the
drive in emergency stop situations. The drive can use the
STO function with asynchronous, synchronous, and
permanent magnet motors.
For more information about Safe Torque O, including
installation and commissioning, refer to the Safe Torque O
Operating Guide.
Liability conditions
The customer is responsible for ensuring that personnel
know how to install and operate the safe torque o
function by:
•
Reading and understanding the safety regulations
concerning health, safety, and accident
prevention.
•
Understanding the generic and safety guidelines
provided in the Safe Torque O Operating Guide.
•
Having a good knowledge of the generic and
safety standards for the specic application.
5.3
Specic VLT® HVAC Drive Features
A drive takes advantage of the fact that centrifugal fans
and pumps follow the laws of proportionality for such
applications. For further information, see
chapter 5.3.1 Using a Drive for Energy Savings.
5.3.1 Using a Drive for Energy Savings
The clear advantage of using a drive for controlling the
speed of fans and pumps lies in the electricity savings.
When comparing with alternative control systems and
technologies, a drive is the optimum energy control system
for controlling fan and pump systems.
120
100
80
60
40
20
0
20 40 60 80 100 120 140 160 180
120
100
80
60
40
20
0 20 40 60 80 100 120 140 160 180
Volume %
Volume %
INPUT POWER % PRESSURE %
SYSTEM CURVE
FAN CURVE
A
B
C
130BA781.11
ENERGY
CONSUMED
Illustration 5.7 Energy Saved with Reduced Fan Capacity
Product Features
VLT
®
HVAC Drive FC 102
26 Danfoss A/S © 11/2017 All rights reserved. MG16C302
55

Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English