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　　The MTL4510 enables four solid-state outputs in the safe area to be controlled by up to four switches or proximity detectors located in a hazardous area. Each pair of output transistors shares a common terminal and can switch +ve or –ve polarity signals. A range of module configurations is available (see Table 1) through the use of selector switches. When proximity detector modes are selected, LFD is enabled and the output switches to OFF if a line fault is detected.

　　SPECIFICATION

　　See also common specification

　　Number of channels

　　4, configured by switches

　　Location of switches

　　Zone 0, IIC, T6 hazardous area

　　Div 1, Group A hazardous location

　　Location of proximity detectors

　　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.

　　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 outputs

　　Floating solid-state outputs compatible with logic circuits

　　Operating frequency: dc to 500Hz

　　Max. off-state voltage: ± 35V

　　Max. off-state leakage current: ± 50µA Max. on-state resistance: 25Ω

　　Max. on-state current: ± 50mA

　　LED indicators

　　Green: power indication

　　Yellow: four: on when output active

　　Red: LFD indication + faulty channel’s yellow LED flashes

　　Maximum current consumption 40mA at 24V (with all output channels energised)

　　Power dissipation within unit 0.96W at 24V, with 10mA loads

　　Safety description (each channel)

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