MTL5514D
SWITCH/ PROXIMITY
DETECTOR INTERFACE
1-channel, dual output, LFD, phase reversal
The MTL5514D enables two safe–area loads to be controlled, through
relays, by a proximity detector or switch located in a hazardous area.
When chosen, open or short circuit conditions in the field wiring are
detected by the line fault detect (LFD) facility and indicated on the top
of the module. Switches are provided to choose phase reversal and to
enable the line fault detection.
SPECIFICATION
See also common specification
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 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)
User-optional via switches on the side of the unit. Line faults are
indicated by an LED. The channel output relays are 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
MTL4514D: two, single pole relays with normally-open contacts
MTL5514D: two, single pole relays with changeover contacts
Note: reactive loads must be adequately suppressed