single channel, with line fault detection
The MTL5511 enables a safe-area load 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 line-fault-detect (LFD) facility and also indicated on the top of the
module. Phase reversal for the 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
One
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. A line fault is
indicated by an LED. 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
Single pole relay with changeover contacts
Note: reactive loads must be adequately suppressed
Relay characteristics
Response time: 10ms maximum
Contact rating: 250V ac, 2A, cosØ >0.7
40V dc, 2A, resistive load
* Signal plug HAZ1-3 is required for access to this function
LED indicators
Green: power indication
Yellow: channel status, on when output is energised
Red: LFD indication, on when line fault is detected
Maximum current consumption
25mA at 24V
Power dissipation within unit
0.6W at 24V
Safety description (each channel)
Vo=10.5V Io=14mA Po=37mW Um = 253V rms or dc
EPS5511-2
Terminal Function
1 Input –ve
2 Input +ve
3 To earth leakage detector*
10 Output normally-closed contact
11 Common
12 Output normally-open contact
13 Supply –ve

14 Supply +ve