Vibration And Shock; Advantages - Danfoss VLT FC51 Design Manual

Safety and Conformity
An extra protection in such areas is a coating of the
printed circuit boards, which can be ordered as an option.
2 2
NOTICE
Mounting frequency converters in aggressive
environments increases the risk of stoppages and consid-
erably reduces the life of the frequency converter.
Before installing the frequency converter, check the
ambient air for liquids, particles, and gases. This is done by
observing existing installations in this environment. Typical
indicators of harmful airborne liquids are water or oil on
metal parts, or corrosion of metal parts.
Excessive dust particle levels are often found on instal-
lation cabinets and existing electrical installations. One
indicator of aggressive airborne gases is blackening of
copper rails and cable ends on existing installations.

2.6 Vibration and Shock

The frequency converter has been tested according to the
procedure based on the shown standards, Table 2.3
Vibration and shock
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
IEC/EN 60068-2-64
Table 2.3 Standards

2.7 Advantages

2.7.1 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 chapter 2.7.3 Example of Energy Savings.
12
®
VLT Micro Drive FC 51 Design Guide
Vibration (sinusoidal) - 1970
Vibration, broad-band random
MG02K302 - Rev. 2013-12-03
2.7.2 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.
100
80
B
60
40
C
20
0 20 40 60 80
VOLUME%
Illustration 2.1 Fan Curves (A, B, and C) for Reduced Fan
Volumes
120
100
80
B
60
40
C
20
0
20 40 60 80
Voume %
120
100
80
60
40
ENERGY
20
CONSUMED
0 20 40 60 80
Voume %
Illustration 2.2 When using a frequency converter to reduce
fan capacity to 60% - more than 50% energy savings may be
obtained in typical applications.
A
SYSTEM CURVE
FAN CURVE
100 120 140 160 180
A
SYSTEM CURVE
FAN CURVE
100 120 140 160 180
100 120 140 160 180