Manual

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 65
Best Practices Chapter 4
7. If more than one brake module is required, the first module must be
mounted within 3.0 m (10 ft) of the drive. Each remaining brake module
can be a maximum distance of 1.5 m (5 ft) from the previous module.
Resistors must be within 30 m (100 ft) of the chopper module.
Within A Cabinet
When multiple equipment is mounted in a common enclosure, group the input
and output conduit/armor to one side of the cabinet as shown in Figure 28
.
Separate any PLC or other susceptible equipment cabling to the opposite side of
the enclosure to minimize the effects of drive-induced noise currents.
Figure 28 - Separating Susceptible Circuits
Common mode noise current returning on the output conduit, shielding, or
armor can flow into the cabinet bond and most likely exit through the adjacent
input conduit/armor bond near the cabinet top, well away from sensitive
equipment (such as the PLC). Common mode current on the return ground wire
from the motor flows to the copper PE bus and back up the input PE ground
wire, also away from sensitive equipment (Refer to Proper Cabinet Ground -
Drives and Susceptible Equipment on page 66).
If a cabinet PE ground wire is used, connect the wire from the same side of the
cabinet as the conduit/armor connections. This keeps the common mode noise
shunted away from the PLC backplane.
Drive Power
Wiring
PWM Drives
Power Distribution
Term in al s
Ground Bus
Sensitive
Equipment
Programmable Logic
Controller and Other
Control Circuits
Drive Control and
Communications Wiring