Vibration And Shock; Safe Torque Off (Sto); Frequency Converter Benefits - Danfoss VLT AQUA Drive FC 202 Design Manual

Introduction
Excessive dust particle levels are often found on instal-
lation cabinets and existing electrical installations. One
indicator of aggressive airborne gases is blackening of
2 2
copper rails and cable ends on existing installations.
D and E enclosures have a stainless steel back channel
option to provide more protection in aggressive
environments. Proper ventilation is still required for the
internal components of the frequency converter. Contact
Danfoss for more information.

2.6 Vibration and Shock

The frequency converter has been tested according to the
procedure based on the following standards:
The frequency converter complies with requirements that
exist for units mounted on the walls and floors of
production premises, as well as in panels bolted to walls or
floors.
•
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
•
IEC/EN 60068-2-64: Vibration, broad-band random

2.7 Safe Torque Off (STO)

STO is an option. To run STO, additional wiring for the
frequency converter is required. Refer to VLT
Converters Safe Torque Off Operating Instructions for further
information.

2.8 Frequency Converter Benefits

2.8.1 Why use a Frequency Converter for
Controlling Fans and Pumps?
A frequency converter takes advantage of the fact that
centrifugal fans and pumps follow the laws of propor-
tionality for such fans and pumps. For further information,
see the text and Illustration 2.1.
2.8.2 The Clear Advantage - Energy Savings
The clear advantage of using a frequency converter for
controlling the speed of fans or pumps lies in the
electricity savings.
When comparing with alternative control systems and
technologies, a frequency converter is the optimum energy
control system for controlling fan and pump systems.
14
Design Guide
Illustration 2.1 Fan Curves (A, B and C) for Reduced Fan
Volumes
More than 50% energy savings can be obtained in typical
applications when a frequency converter is used to reduce
fan capacity to 60%.
®
Frequency
Illustration 2.2 Energy Savings
Danfoss A/S © Rev. 06/2014 All rights reserved.
A
100
80
B
60
40
C
20
0 20 40 60 80 100
VOLUME%
120
A
100
80
B
60
40
C
20
0
20 40 60 80 100
Voume %
120
100
80
60
40
ENERGY
20
CONSUMED
0 20 40 60 80 100
Voume %
SYSTEM CURVE
FAN CURVE
120 140 160 180
SYSTEM CURVE
FAN CURVE
120 140 160 180
120 140 160 180
MG20Z202