Emerson Unidrive M702 - Supply and Ground Cable Clearance; Grounding the Drive, Motor Cable Shield and Filter; Sensitive Signal Circuit Clearance; Grounding the Motor Cable Shield

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Unidrive M702 User Guide 75
Issue Number: 3
Figure 4-33 Supply and ground cable clearance (size 7 onwards)
Ensure the AC supply and ground cables are at least 100 mm from the
power module and motor cable.
Figure 4-34 Sensitive signal circuit clearance
Avoid placing sensitive signal circuits in a zone 300 mm (12 in) in the
area immediately surrounding the power module.Ensure good EMC
grounding.
Figure 4-35 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 4-36 Grounding the motor cable shield
100mm (4in)
100mm (4in)
100mm
(4in)
Sensitive
signal
cable
≥ 300 mm
(12 in)
Ensure direct
metal contact
at drive and
filter mounting
points (any
paint must be
removed).
Motor cable shield
(unbroken) electrically
connected to and held
in place by grounding
clamp.