Rockwell Automation 20-750-PBUS Profibus DPV1 Option Module - Manual (Page 22)

22 Rockwell Automation Publication 750COM-UM004B-EN-P - September 2012
Chapter 2 Installing the Option Module
Connecting the Option
Module to the Drive
1. Insert the option module into Port 4, 5, or 6 and tighten the module
mounting screws into the pod mounting bracket. To properly ground the
module to the drive, torque both mounting screws to 0.45…0.67 N•m
(4.0…6.0 lb•in).
2. When another module (I/O, encoder, communication, and so forth)
resides in the adjacent port to the left of the 20-750-PBUS option
module—and the lower mounting screw of that module is a larger T15
Torx head screw, perform addition steps 2a through 2d. If the port is
empty or the adjacent module already uses the smaller T8 Torx head
mounting screws, save this spare screw for future use.
The option module is shipped with a small bag containing a spare T8 Torx
head mounting screw and an adhesive-backed polycarbonate insulator
strip. The larger T15 Torx head mounting screw on the adjacent left
module may electrically contact the metal Profibus cable connector when
attached to the Profibus module. The polycarbonate insulator strip is
provided to prevent electrical contact between the smaller T8 Torx head
mounting screw and the Profibus cable metal connector when attached to
the Profibus module. Either of these possible electrical contact situations
may cause faulty operation. To prevent this, perform the following steps.
a. Remove the adjacent module’s lower mounting screw, the T15 Torx
head screw closest to the bottom of the pod mounting bracket.
b. Replace the larger T15 Torx head screw with the smaller, spare T8 Torx
head mounting screw.
c. Tighten the mounting screw to the pod mounting bracket to properly
ground the adjacent module to the drive. Torque the screw to
0.45…0.67 N•m (4.0…6.0 lb•in).
d. Attach the adhesive-backed polycarbonate strip to the metal Profibus
cable connector in a location that prevents electrical contact between
the connector and the adjacent module’s lower mounting screw when
the connector is attached to the Profibus module.
IMPORTANT Remove power from the drive before installing the option module in the
drive control pod.
TIP To remove the captive T15 Torx head screw, the module must be
removed to back the screw out of the mounting clip.