Mtl5501-Sr - Fail-Safe Switch/Proximity Detector Interface - Eaton MTL5501-SR Instruction Manual

Crouse-hinds series mtl5500 range isolating interface units

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Instruction manual (88 pages)

Table Of Contents

Table of Contents

6 .1 .3

Single channel, fail-safe module with line-fault detection

The MTL5501-SR enables a fail-safe switch/proximity detector located in the hazardous area

to control an isolated fail-safe electronic output. It provides line-fault detection (LFD) alarm

contacts and is designed for use with approved fail-safe sensors in loops that require operation

up to SIL3 according to the functional safety standard IEC 61508.

Note: For reliable, long-term operation the load on the LFD switching relay should be not less

than 50mW, e.g. 10mA at 5V DC.

LFD

O/P

MTL5501-SR

PWR

Figure 6 .2:

Top label for

MTL5501-SR

Correct operation of the fail-safe output and LFD is indicated by the LEDs on the front of the

unit. The yellow O/P LED is ON when the fail-safe output is energised. The red LFD LED flashes

if a line fault is detected. The fail-safe output is de-energised (OFF) if the module detects an

incorrect sensor current, an open circuit or a short circuit in the sensor circuit.

Input signal sensors may be either suitable proximity sensors or switches. The proximity sensor

properties are specified in the standard EN60947-5-6:2001; however, when used with

MTL5501-SR modules, additional requirements for the "low-impedance" current of 3.4

±0.5mA must be met. The list below shows suitable proximity sensors, all manufactured by

Pepperl+Fuchs Group, Germany, and specified as usable to SIL3, according to IEC 61508:

SJ 2-SN

SJ 3,5-SN

SJ 3,5-S1N

NJ 2-11-SN

NJ 2-11-SN-G

NJ 2-12GK-SN