MTL4504 SWITCH/ PROXIMITY DETECTOR INTERFACE 1-channel with LFD and phase reversal

MTL4504 SWITCH/ PROXIMITY DETECTOR INTERFACE 1-channel with LFD and phase reversal.

The MTL4504 enables a safe–area load to be controlled, through a relay, by a proximity detector or switch located in a hazardous area. Line
faults are signalled through a separate relay and indicated on the top of the module. MTBF information for the LFD relay is available from Eaton
to allow the failure rate for the LFD relay to be calculated when used in the critical path with the output relay for safety critical applications.
Switches are provided to select 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) (when selected)
User-selectable via switches on the side of the unit. Line faults are
indicated by an LED. Line fault relay is de-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: Single pole relay with changeover contacts
LFD: Single pole relay with changeover contacts
Note: reactive loads must be adequately suppressed

Relay characteristics
MTL4504
Response time: 10ms maximum Contact rating
(Safe Area):10W, 0.5A, 35V dc
Contact rating(Zone 2): 10W, 0.5A, 35V dc

LED indicators
Green: power indication
Yellow: channel status, on when output energised
Red: LFD indication, on when line fault detected
Maximum current consumption
25mA at 24V dc
Power dissipation within unit
0.6W at 24V
Safety description
Uo=10.5V Io=14mA Po=37mW Um = 253V rms or dc