The MTL4517/MTL5517 enables two safe-area loads to be controlled, through a relay, by proximity detectors or switches located in a hazardous area. Line faults are signalled through a separate relay and indicated on the top of the module. Switches are provided to select phase reversal and to enable the line fault detection.

　　SPECIFICATION

　　See also common specification

　　Number of channels

　　Two

　　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 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 by switches on the side of the module. Line faults are indicated by the LED for each channel. Line fault relay is energised and channel output relay de-energised if input line-fault 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

　　Channel: Two single-pole relays with normally open contacts

　　LFD: Single pole relay with changeover contact (MTL4517) Single pole relay with normally open contact (MTL5517) 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