Explosion Proof Design - Emerson Bettis RTS Installation, Operation And Maintenance Manual

Section 5: Connection
September 2023
5.2

Explosion Proof Design

For explosion proof actuators and control units, the connection to the fieldbus
is realized through screw terminals. As shown in Figure 3, an additional frame is
provided to enable proper wiring. There are in total four M20x1.5 threaded holes,
which lead directly to shielding connection clamps, to allow proper earthing of the
fieldbus cables.
NOTE:
The shield must be connected to the shielding connection clamp (windowcut) - see
Figure 3 and 4.
Figure 3.
Shielding connection clamp
The devices are connected via crossover cables, i.e.:
•
•
•
•
The cable types recommended are standard patch cables (twisted pair, S/UTP,
AWG26, Cat5e).
The cable shield has to be connected to the actuator housing over the shielding
connection clamp.
It is important to ensure that there are no potential differences between the
individual devices in the PROFINET network so that no transient currents flow over
the cable shield.
6
Connection to the Fieldbus
Additional frame
Terminal strip
Tx+ to Rx+
Tx- to Rx-
Rx+ to Tx+
Rx- to Tx-
Installation, Operation and Maintenance Manual
Metallic cable glands (closed with blind
screw connections at delivery) 4 xM20x1.5
FCIM-20054-EN Rev. 0
Connection