Eaton MTL MTL4514/B – MTL5514 Switch/Proximity Detector Interface

The MTL4514/B and MTL5514 are 1-channel switch/proximity detector interfaces designed for hazardous area applications. These devices provide a safe method to control a load in a safe area using a switch or proximity detector located in a hazardous environment.

The MTLx514 allows control of a safe-area load through a relay via a proximity detector or switch located in a hazardous area. Line faults are signaled through a separate relay and indicated on the module. Switches enable phase reversal and line fault detection.

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Specifications

Number of channels:

• One

Location of Switch:

• Zone 0, IIC, T6 hazardous area
• Div.1, Group A, hazardous location

Location of Proximity Detector:

• Zone 0, IIC, T4–6 hazardous area (if suitably certified)
• Div.1, Group A, hazardous location

Hazardous-area Inputs:

• Inputs conform to BS EN60947–5–6:2001 standards for proximity detectors (NAMUR)

Voltage Applied to Sensor:

• 7 to 9V DC from 1kΩ ±10%

Input/Output Characteristics:

• Normal phase:
  • Outputs closed if input > 2.1mA (< 2kΩ in input circuit)
  • Outputs open if input < 1.2mA (> 10kΩ in input circuit)
  • Hysteresis: 200µA (650Ω) nominal

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Line Fault Detection (LFD)

• User-selectable via switches on the unit.
  • Line faults are indicated by an LED.
  • LFD relay energizes, channel output relay de-energizes if input line-fault detected.
• Open-Circuit Alarm:
  • On if Iin < 50µA
  • Off if Iin > 250µA
• Short-Circuit Alarm:
  • On if Rin < 100Ω
  • Off if Rin > 360Ω

Note: Resistors must be fitted when using the LFD facility with a contact input:

• 500Ω to 1kΩ in series with switch
• 20kΩ to 25kΩ in parallel with switch

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Safe-area Output:

MTL4514 & MTL5514:

• Channel: Single pole relay with changeover contacts
• LFD: Single pole relay with changeover contacts

MTL4514B:

• Channel: Single pole relay
• LFD: Single pole relay

Relay Characteristics:

• Response time: 10ms max
• Contact Rating (Safe Area):
  • 10W, 0.5A, 35V DC
  • 250V AC, 2A, cosØ >0.7, 40V DC, 2A, resistive load
• Contact Rating (Zone 2):
  • 10W, 0.5A, 35V DC
  • 35V, 2A, 100VA

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LED Indicators:

• Green: Power indication
• Yellow: Channel status, on when output energized
• Red: LFD indication, on when line fault detected

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Electrical Characteristics:

• Max Current Consumption: 25mA at 24V DC
• Power Dissipation: 0.6W at 24V DC

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Safety Descriptions:

• Uo=10.5V, Io=14mA, Po=37mW, Um=253V rms or DC
• SIL2 and SIL3 capable for IEC 61508 functional safety applications

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Wiring Diagrams:

There are wiring diagrams for the MTL4514, MTL4514B, and MTL5514 models showing connections between the hazardous area and the safe area, including the placement of resistors for line fault detection.

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