Honeywell SYA14 Series Manual page 592

FUSES PROTECTION
The EM1 and EM2 inputs must be protected by an external 0.5A fuse connected on
terminal 1 (+24 V POWER).
DETECTED FAILURES
The following failures are detected and prevent a muting sequence from starting : absence
of one or both EMs sensors, permanent short-circuit on one of the EM inputs.
Features
Type
Consumption
Low level
High level
Protections
Figure 4.10 : Connection of the EMs sensors
The following reversed connection is recommended for a better failure resistance
+24Vdc
0.5A
EM1
22 21
(+) (-)
FF-SRM
(+) (-)
11 12
EM2
0V
58
EM1 & EM2 inputs
voltage free and without reference potential
10 mA/24 Vdc
2 mA max.
5 mA min.
galvanic insulation : 500 Vdc, reversed polarity
+24Vdc
0.5A PNP EM1
22
(+)
(+)
11
EM2
0V
107004-15 EN FR26 ROW 0899 Printed in France
21
(-)
FF-SRM
(-)
12
NPN