6.1.8 MTL4514/MTL4514B/MTL4514D - Switch/Proximity detector interface
Single channel, with line-fault detection and phase reversal
The MTL4514 and MTL4514B 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. The MTL4514D enables
two safe-area loads to be controlled by a single hazardous area proximity detector or
switch, with line faults indicated on the top of the module. Line-Fault Detect and Phase
Reversal for the channel are selected by DIL switches on the side of the module. Output is
provided by changeover relay contacts in the MTL4514 and single-pole relay contacts in
the MTL4514B and MTL4514D.
See page 15 for LFD and PR switch details. Channel 1 only switch settings apply.
For switch sensor inputs, with LFD selected, make sure resistors (22k
and 680 ) are fitted.
Note: For reliable, long-term operation the load on the output switching relays should not
be less than 50mW, e.g.10mA at 5VDC.
Terminal
Function
MTL4514 MTL4514B MTL4514D
1
Input –ve
Input +ve
2
7
Output contact N.O. Output contact N.O. Output 1 contact N.O.
8
Output common Output contact N.O. Output 1 contact N.O.
9
Output contact N.C. – –
10
LFD contact N.O. LFD contact N.O. Output 2 contact N.O.
11
LFD common LFD contact N.O. Output 2 contact N.O.
12
LFD contact N.C. – –
13
Supply – ve
Supply +ve
14
N.O. = normally open N.C. = normally closed
Hazardous area Safe area
Figure 6.8:
Top labels for
MTL4514,
MTL4514B &
MTL4514D
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