INM 5500 Rev 11
32
Hazardous area
Safe area
6 .2 .3
MTL5523 - Solenoid Alarm driver
Single channel, with line-fault detection, IIC
The MTL5523 interface controls an on/off device in a hazardous area using a volt-free contact
or logic signal in the safe area, and is suitable for driving loads such as solenoids. Line-Fault
Detection (LFD)
operates independently of the output state
and is signalled by a safe-area,
solid-state switch output which, when a field line is open or short-circuited, becomes de-
energised. Earth-fault detection can be provided by connecting an MTL4220 earth leakage
detector to terminal 3.
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Solenoid, alarm
or other IS device
+
–
Vs–
Vs+
20 to 35V dc
+
–
LFD
+
‡
‡ link to reverse output phase
Control
Terminal
Function
1
Output –ve
2
ve
7
Line fault signal -ve
8
Phase reversal link
9
Phase reversal link
10
Line fault ve
11
Control –ve
12
Cve
13
Supply –ve
14
ve
Figure 6 .12:
Top label
for MTL5523
