Mtl4504 - Switch/Proximity Detector Interface - Eaton Crouse-Hinds Series Instruction Manual

INM 4500/4600 Rev 12
DRAFT - 22 March 2018
6 .1 .4

MTL4504 - Switch/Proximity detector interface

Single-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.
Note that series and parallel resistors are required for switch inputs with LFD - see Section 6.1.2
for recommended values.
Note: For reliable, long-term operation the load on the output switching relays should not
be less than 50mW, e.g.10mA at 5VDC.
Hazardous area
680Ω
22kΩ
LFD
Switch-type sensors
STS
require resistors
if LFD is selected
MTL4504
PWR
Figure 6 .3:
Top label for
Terminal
MTL4504
1
2
3
7
8
9
10
11
12
13
14
Safe area
6
To earth-leakage
5 LFD
detector *
4
3
+
2
1
–
13 14
Function
Input –ve
Input +ve
To earth leakage detector*
Normally-open contact (output)
Common (output)
Normally-closed contact (output)
Normally-open contact (LFD)
Common (LFD)
Normally-closed contact (LFD)
Supply – ve
Supply +ve
12
11 LFD
10
9
Output
8
7
20 to 35V dc
Vs+
Vs–
17