74
Sigmatek FDD Sizes 7 to 9 Power Installation Guide
4.9.7 Ensure good EMC grounding.
Figure 4-18 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 full 360
°
termination of the shield to the
terminal housing of the motor is beneficial.
It is unimportant for EMC purposes whether the motor cable contains an internal (safety) ground
core, or there is a separate external ground conductor, or 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 4-19 Grounding the motor cable shield
Unshielded wiring to the optional braking resistor(s) may be used, provided the wiring does not run
external to the enclosure. Ensure a minimum spacing of 300 mm (12 in) from signal wiring and the
AC supply wiring to the external EMC filter. Otherwise this wiring must be shielded.
Motor cable screen
(unbroken) physically
fixed to the backplate.
Ensure direct
metal contact
at drive and
filter (not shown)
mounting
points (any
paint must be
removed).
Summary of Contents for 074.00660
Page 1: ...Power Installation Guide SIGMATEK FDD Frame 7 to 9 Issue 12...
Page 97: ......
Page 98: ...0478 0641 12...
