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Reinforce grounding with the following protective earth connection requirements:
Ground wire (terminal 95) of at least 10 mm
2
(8 AWG) cross-section.
2 separate ground wires both complying with the dimensioning rules.
See EN/IEC 61800-5-1 and IEC EN 62477-1 for further information.
W A R N I N G
DISCHARGE TIME
Touching the electrical parts, even after the equipment has been disconnected from mains, could be fatal.
Make sure that other voltage inputs have been disconnected, such as load sharing (linkage of DC-link), and the motor con-
nection for kinetic back-up.
Before touching any electrical parts, wait at least the amount of time indicated in the safety chapter. Shorter time is allowed
only if indicated on the nameplate for the specific unit.
W A R N I N G
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the drive properly can result in death or serious injury.
Ensure the correct grounding of the equipment by a certified electrical installer.
6.8.1 Using a Residual Current Device (RCD)
Where residual current devices (RCDs), also known as earth leakage circuit breakers (ELCBs), are used, comply with the following:
Use RCDs of type B only, which are capable of detecting AC and DC currents.
Use RCDs with an inrush delay to prevent faults caused by transient ground currents.
Dimension RCDs according to the system configuration and environmental considerations.
The leakage current includes several frequencies originating from both the mains frequency and the switching frequency. Whether
the switching frequency is detected depends on the type of RCD used.
e30bb958.12
Leakage current
Mains Cable
RCD with low f
Illustration 46: Mains Contributions to Leakage Current
The amount of leakage current detected by the RCD depends on the cut-off frequency of the RCD.
AJ330233902305en-000201 / 130R0596 | 65Danfoss A/S © 2021.05
Electrical Installation
Considerations
VLT® Compressor Drive CDS 803
Design Guide
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