Design Guide | iC2-Micro Frequency Converters Electrical Installation Considerations
The components that make up the electrical isolation, as shown in Figure 42, also comply with the requirements for higher isolation and
the relevant test as described in EN 61800-5-1.
The PELV galvanic isolation can be shown in 3 locations (see Figure 42):
To maintain PELV, all connections made to the control terminals must be PELV, for example, the thermistor must be reinforced/double
insulated.
Figure 42: Galvanic Isolation
1 Customer relay 2 Communication between power card and control card
3 Power supply (SMPS) for control card a Functional galvanic isolation for the RS485 standard bus
interface
WARNING
SAFETY RECOMMENDATIONS
Failure to follow the recommendations could result in death or serious injury.
l Before touching any electrical parts, ensure that other voltage inputs have been disconnected, such as load sharing (linkage
of DC link) and the motor connection for kinetic backup.
l Observe the discharge time stated in the chapter Safety in the operating guide.
7.6 Ground Leakage Current
Follow national and local codes regarding protective grounding of equipment with a leakage current >3.5mA. Drive technology implies
high frequency switching at high power. This switching generates a leakage current in the ground connection. A fault current in the
drive at the output power terminals might contain a DC component, which can charge the filter capacitors and cause a transient ground
current. The ground leakage current is made up of several contributions and depends on various system configurations including:
l RFI filtering.
l Shielded motor cables.
l Motor cable length.
l Drive power.
Danfoss A/S © 2024.08 AJ402315027937en-000401 / 130R1239 | 83
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