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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 119
Issue Number: 1
4.17.4 Grounding of the drive and EMC filter
Connect the shield of the motor cable to the ground terminal of the motor frame using a link that is as short as possible and not exceeding 50 mm
(2 in) long. A complete 360° termination of the shield to the terminal housing of the motor is beneficial.
From an EMC consideration it is irrelevant whether the motor cable contains an internal (safety) ground core, or if there is a separate external ground
conductor, or where grounding is through the shield alone. An internal ground core will carry a high noise current and therefore it must be terminated
as close as possible to the shield termination.
Figure 4-37 Grounding the drive, motor cable shield and filter
Figure 4-38 Grounding the motor cable shield
points (any
paint must be
removed).
Motor cable shield
(unbroken) electrically
connected to and held
in place by grounding
clamp.
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