Design Guide | iC2-Micro Frequency Converters iC2-Micro Frequency Converters
Table 5: Functions of Each Component (continued)
Area Component Functions
6 Capacitor bank • Stores the DC power.
• Provides ride-through protection for short power losses.
7 Brake chopper
(2)
Brake chopper is used in the DC link to control DC voltage when the load feeds energy back.
8 Inverter Converts the DC into a controlled PWM AC waveform for a controlled variable output to the motor.
9 Output to motor Regulated 3-phase output power to the motor.
10 Control circuitry • Input power, internal processing, output, and motor current are monitored to provide efficient
operation and control.
• User interface and external commands are monitored and performed.
• Status output and control can be provided.
1) DC reactor is only applicable to enclosure size MA05a.
2) Brake chopper is not applicable to enclosure size MA01a.
3.3 Ecodesign for Power Drive Systems
3.3.1 Overview
Energy-efficiency of the overall system is important and compliance with relevant legislation is required in the extended single market in
the European Economic Area.
Frequency converters are classified by efficiency classes IE0 to IE2 according to IEC 61800-9-2 and EN 50598-2. According to the standard,
power losses are measured as percentages of the rated apparent output power at 8 load points as shown in Figure 2. Together with
information about other elements of the system, this information can be used to calculate a system level efficiency (IES).
Elements causing losses are described in 3.3.2 Power Losses and Efficiency.
Figure 2: Operating Point According to IEC 61800-9-2 (EN 50598)
The frequency converter is labeled with the efficiency class and the power losses at 100% rated torque-producing current and 90% rated
motor stator frequency.
MyDrive® ecoSmart™ can be used to:
l Look up part load data as defined in IEC 61800-9-2.
l Calculate the efficiency class and part load efficiency for the frequency converter and the Power Drive System.
l Create a report documenting part load loss data and IE and IES efficiency class.
Danfoss A/S © 2024.08 AJ402315027937en-000401 / 130R1239 | 17
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