Rockwell Automation 1336E IMPACT Adjustable Frequency AC Drive User Manual V 1-4.XX - Manual (Page 33)

Mounting and Wiring Your 1336 IMPACT Drive 2-15
Connecting the Drive to the System Ground
Connect the drive to the system ground at the power ground (PE)
terminal provided on the power terminal block (TB1). Ground
impedance must conform to the requirements of national and local
industrial safety regulations (such as NEC, VDE 0160, and BSI). You
should inspect and test the ground impedance at appropriate and
regular intervals.
In any cabinet, you should use a single, low-impedance ground point
or ground bus bar. You should:
• Ground all circuits independently and directly to this ground
point or bus bar.
• Directly connect the AC supply ground conductor to this ground
point or bus bar.
Defining the High Frequency Ground Current Paths
You need to define the paths through which the high frequency
ground currents flow. Defining these paths helps to assure that
noise-sensitive circuits do not share a path with high-frequency
ground currents and to minimize the area enclosed by these paths.
You must separate current carrying ground conductors. Control and
signal ground conductors should not run near or parallel to a power
ground conductor.
Connecting the Ground Conductor of the Motor Cable
Connect the ground conductor of the motor cable (drive end) directly
to the drive ground terminal, not to the enclosure bus bar. Grounding
directly to the drive (and filter, if installed) provides a direct route for
high-frequency current returning from the motor frame and ground
conductor. At the motor end, you should also connect the ground
conductor to the motor case ground.
If you use shielded or armored cables, connect the shield to the drive
chassis and the motor frame.
Even if you have a floating secondary, the building must have a
safety (earth) ground.