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　　The MTL4516 enable two safe-area loads to be controlled by a switch or proximity detector located in a hazardous-area. When selected, open or short circuit conditions in the field wiring are detected by the linefault-detect (LFD) facility and also indicated on the top of the module. Phase reversal for each channel is selected by a switch on the side of the module and output is provided by changeover relay contacts.

　　SPECIFICATION

　　See also common specification

　　Number of channels

　　Two

　　Location of switches 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 conforming 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

　　Line fault detection (LFD) (when selected)

　　User-selectable via switches on the side of the unit. Line faults are indicated by an LED for each channel. The channel output relay is de-energised if an input line fault is detected.

　　Open-circuit alarm on if Iin < 50µA

　　Open-circuit alarm off if Iin > 250µA

　　Short-circuit alarm on if Rin < 100Ω

　　Short-circuit alarm 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

　　Safe-area output

　　Two single-pole relays with changeover contacts Note: reactive loads must be adequately suppressed

　　Safe-area output

　　Two single-pole relays with changeover contacts

　　Note: reactive loads must be adequately suppressed Relay characteristics

　　Maximum current consumption

　　35mA at 24V

　　Power dissipation within unit

　　0.84W at 24V

　　LED indicators

　　Green: power indication

　　Yellow: two: channel status, on when output energised

　　Red: two: LFD indication, on when line fault detected

　　Safety description (each channel)

　　Uo=10.5V Io=14mA Po=37mW Um = 253V rms or dc

　　SIL capable

　　These models have been assessed for use in IEC 61508 functional safety applications. SIL2 capable for a single device (HFT=0) SIL3 capable for multiple devices in safety redundant configurations (HFT=1) See data on MTL web site and refer to the safety manual