Unidrive M/HS Frame 5 to 6 Power Installation Guide 77
Issue Number: 9
Safety information Product information Mechanical installation
Electrical installation
Technical data UL listing information
Figure 4-19 Grounding the drive, motor cable shield and 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 4-20 Grounding the motor cable shield
Unshielded wiring to the optional braking resistor(s) may be used provided the wiring runs internally
to the enclosure. Ensure a minimum spacing of 300 mm (12 in) from the signal wiring and the AC
supply wiring to the external EMC filter. If this condition cannot be met then the wiring must be
shielded.
points (any
paint must be
removed).
Motor cable shield
(unbroken) electrically
connected to and held
in place by grounding
clamp.
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