INM 5500 Rev 11
69
10 .2 MTL5018AC single-pole, changeover relay,
two-channel, switch/proximity detector with line fault detection
and phase reversal
The MTL5018AC modules enable each of two safe-area loads to be relay-controlled by switches
or proximity detectors in a hazardous area.
Line fault detection (LFD) and output phase reversal facilities are included (see section 6.1).
10 .2 .1 Wiring connections
See figure 10.1 for wiring connections.
Note:
Reactive loads must be adequately suppressed.
10 .2 .2 Line fault detection
(See section 6.1 for definition of a line fault)
On each channel, input line faults (open- or short-circuit) are indicated by an LED and the
de-energising of the output. LFD is enabled/disabled by switches located on the top of
the module.
Note:
that if the LFD facility is enabled for switch inputs, the resistors
shown in 10.1 and 10.2
MUST be fitted.
Terminal
Function
1
Input –ve (Ch 1)
2
Input +ve (Ch 1)
3
4
Input –ve (Ch 2)
5
Input +ve (Ch 2)
6
7
Normally-closed contact (Ch 2)
8
Common (Ch 2)
9
Normally-open contact (Ch 2)
10
Normally-closed contact (Ch 1)
11
Common (Ch 1)
12
Normally-open contact (Ch 1)
13
Supply N
14
Supply L
Hazardous area
Safe area
Figure 10 .1: MTL5018AC wiring diagram and connections
