System Integration; Ambient Operating Conditions; Humidity - Danfoss VLT Refrigeration Drive FC 103 Design Manual

System Integration

3 System Integration
This chapter describes the considerations necessary to
integrate the frequency converter into a system design.
The chapter is divided into these sections:
•
Chapter 3.1 Ambient Operating Conditions
Ambient operating conditions for the frequency
converter including:
- Environment.
- Enclosures.
-
Temperature.
- Derating.
- Other considerations.
•
Chapter 3.2 EMC, Harmonics, and Ground Leakage
Protection
Input (regeneration) from the frequency converter
to the power grid including:
- Power.
-
Harmonics.
- Monitoring.
- Other considerations.
•
Chapter 3.4 Mains Integration
Input into the frequency converter from the
mains side including:
- Power.
-
Harmonics.
- Monitoring.
- Cabling.
-
Fusing.
- Other considerations.
•
Chapter 3.5 Motor Integration
Output from the frequency converter to the
motor including:
- Motor types.
- Load.
-
Monitoring.
- Cabling.
- Other considerations.
•
Chapter 3.6 Additional Inputs and Outputs,
chapter 3.7 Mechanical Planning
Integration of the frequency converter input and
output for optimal system design including:
- Frequency converter/motor matching.
-
System characteristics.
- Other considerations.
MG16G202
Design Guide
A comprehensive system design anticipates potential
problem areas while implementing the most effective
combination of frequency converter features. The
information that follows provides guidelines for planning
and specifying a motor-control system incorporating
frequency converters.
Operational features provide a range of .design concepts,
from simple motor speed control to a fully integrated
automation system with for example:
•
•
•
•
A complete design concept includes detailed specification
of needs and use.
•
•
•
•
•
•
•
•
•
•
See chapter 3.10 System Design Checklist for a practical
guide for selection and design.
Understanding features and strategy options can optimise
a system design and possibly avoid introducing redundant
components or functionality.

3.1 Ambient Operating Conditions

3.1.1 Humidity

Although the frequency converter can operate properly at
high humidity (up to 95% relative humidity), avoid conden-
sation. There is a specific risk of condensation when the
frequency converter is colder than moist ambient air.
Moisture in the air can also condense on the electronic
components and cause short circuits. Condensation occurs
in units without power. Install a cabinet heater when
Danfoss A/S © 08/2015 All rights reserved.
Handling of feedback.
Operational status reporting.
Automated fault responses.
Remote programming.
Frequency converter types
Motors
Mains requirements
Control structure and programming
Serial communication
Equipment size, shape, weight
Power and control cabling requirements; type and
length
Fuses
Auxiliary equipment
Transportation and storage
3 3
35