Wiring Precautions

Introduction

In order to protect the signal from outside interference induced in series mode and interference in common mode, we recommend that you take the following precautions.

Cable Shielding

Connect the cable shielding to the grounding bar. Clamp the shielding to the grounding bar on the module side. Use the shielding connection kit BMXXSP•••• to connect the shielding.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

While mounting / removing the modules:

make sure that each terminal block is still connected to the shield bar and
disconnect voltage supplying sensors and pre-actuators.

Failure to follow these instructions will result in death or serious injury.

TELEFAST connection:

Connect the sensor cable shielding to the terminals provided and the whole assembly to the cabinet ground.

Reference of Sensors in Relation to the Ground

In order for the acquisition system to operate correctly, we recommend you take the following precautions:

sensors must be close together (a few meters)
all sensors must be referenced to a single point, which is connected to the PLC’s ground

Using the Sensors Referenced in Relation to the Ground

The sensors are connected as indicated in the following diagram:

If the sensors are referenced in relation to the ground, this may in some cases return a remote ground potential to the terminal block. It is therefore essential to follow the following rules:

The potential must be less than the permitted low voltage: for example, 30 Vrms or 42.4 VDC.
Setting a sensor point to a reference potential generates a leakage current. You must therefore check that all leakage currents generated do not disturb the system.

DANGER

HAZARD OF ELECTRIC SHOCK

Sensors and other peripherals may be connected to a grounding point some distance from the module. Such remote ground references may carry considerable potential differences with respect to local ground.

Ensure that:

potentials greater than permitted low limits cannot exist,
induced currents do not affect the measurement or integrity of the system.

Failure to follow these instructions will result in death or serious injury.

Electromagnetic Hazard Instructions

CAUTION

UNEXPECTED BEHAVIOR OF APPLICATION

Follow those instructions to reduce electromagnetic perturbations:

use the shielding connection kit BMXXSP•••• to connect the shielding.

Electromagnetic perturbations may lead to an unexpected behavior of the application.

Failure to follow these instructions can result in injury or equipment damage.