Rockwell Automation 1336F PLUS II User Manual - Firmware 1.xxx-6.xxx - Manual (Page 20)

2–10 Installation/Wiring
Emission
Careful attention must be given to the arrangement of power and
ground connections to the drive to avoid interference with nearby sen-
sitive equipment. The cable to the motor carries switched voltages
and should be routed well away from sensitive equipment.
The ground conductor of the motor cable should be connected to the
drive ground (PE) terminal directly. Connecting this ground conduc-
tor to a cabinet ground point or ground bus bar may cause high fre-
quency current to circulate in the ground system of the enclosure. The
motor end of this ground conductor must be solidly connected to the
motor case ground.
Shielded or armored cable may be used to guard against radiated
emissions from the motor cable. The shield or armor should be con-
nected to the drive ground (PE) terminal and the motor ground as
outlined above.
Common mode chokes at the drive output can help reduce common
mode noise on installations that do not use shielded cable. Common
mode chokes can also be used on analog or communication cables.
Refer to page
2–37 for further information.
An RFI filter can be used and in most situations provides an effective
reduction of RFI emissions that may be conducted into the main
supply lines.
If the installation combines a drive with sensitive devices or circuits,
it is recommended that the lowest possible drive PWM carrier fre-
quency be programmed.
RFI Filtering 1336 PLUS II drives can be installed with an RFI filter, which controls
radio-frequency conducted emissions into the main supply lines and
ground wiring.
If the cabling and installation recommendation precautions described
in this manual are adhered to, it is unlikely that interference problems
will occur when the drive is used with conventional industrial elec-
tronic circuits and systems. However, a filter may be required if there
is a likelihood of sensitive devices or circuits being installed on the
same AC supply.
Where it is essential that very low emission levels must be achieved
or if conformity with standards is required the optional RFI filter must
be used. Refer to Appendix C and instructions included with the filter for
installation and grounding information.
CE Conformity Refer to Appendix C.