Design Guide | iC2-Micro Frequency Converters Electrical Installation Considerations
RCD/RCM devices cannot differentiate between operating and fault currents, and their function can be impaired. RCDs can be triggered
even though there is no insulation fault in the installation.
Current measured by an RCD/RCM on mains phases might differ from the measured PE current. This is due to magnetic coupled PE
current not being present on mains phases.
The frequency characteristic of Type B RCDs is not completely standardized, and vendor-specific differences are to be expected in the
upper frequency range. Consult the documentation of the RCD in question for more information.
7.3.5 Isolation Monitoring Devices
When operating on an IT grid, isolation monitoring devices can be used for observing the integrity of the isolation in the supply cabling,
motor, motor cabling, and the drive.
The typical applications are:
l Preventive detection of degradation of the isolation system.
l Ground fault detection on IT mains.
The isolation monitor is a key component in an IT mains installation. It allows preventive maintenance and warns whenever a ground
fault occurs. Several types of isolation monitors exist with different operation principles, for example, DC-voltage injection, DC voltage
with alternating polarity injection and current injection. Not all isolation monitors are compatible with drive systems due to capacitances
to ground and drives producing common-mode voltages. It is essential that the isolation monitor used in a drive system installation is
compatible with drives.
7.4 EMC-compliant Installation
7.4.1 EMC-compliant Installation Guidelines
This chapter gives a general introduction to proper EMC-compliant installation practice.
To obtain an EMC-compliant installation, follow the instructions provided in the operating guide supplied with the drive.
See Figure 39 for an example on how to ensure a proper EMC-compliant installation.
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