Eaton MTL4516 - MTL4514 N - Switch;Proximity Detector Interface

INM 4500/4600 Rev 12
25
DRAFT - 22 March 2018 DRAFT - 22 March 2018
6.1.9 MTL4514N - Switch/Proximity detector interface
Single channel, with line-fault detection with passthrough and phase reversal
The MTL4514N is designed to work with system inputs which monitor the impedance
of the field circuit in order to detect line faults. Low and high impedance states reflect a
switch closed or open in the field. An open circuit state is used to signal a line fault.
There are 2 relays and resistors provided, the main channel relay switches the 2k2
resistor across the system input. The LFD relay switches a 15k resistor in parallel with the
2k2. When a line fault is detected the main relay is open and the LFD relay is open thus
providing an open circuit condition on the system input.
A custom backplane designed for the MTL4514N must be used or, if a general purpose
backplane is used, the module outputs must be wired in parallel (terminals 8-10 and
9-11 linked). Switch contacts in the field must be fitted with end of line resistors if LFD
passthough is required.
Terminal Function
1 Input –ve
2 Input +ve
8 Output N.O.
9 Output Common
10 LFD N.O.
11 LFD Common
12 ID resistor
Hazardous area Safe area
Figure 6.9:
Top label for
MTL4514N
22kΩ
680Ω
+
–
Output
LFD
Switch-type sensors
require resistors
if LFD is selecte
d
Vs–
Vs+
20 to 35V dc
To earth-leakage
detector *
ID
6
5
4
3
2
1
LFD
9
8
7
12
11
10
13
14
15K
2K2