Honeywell SYA14 Series Manual page 601

DETECTED FAILURES
The following failures are detected and prevent a muting sequence from starting : absence
of one push-button, permanent short-circuit on one of the P/B inputs, connection of a single
push-button on both P/B inputs.
FUSES PROTECTION
The P/B1 and P/B2 inputs must be protected by an external 0.5A fuse connected on
terminal 1 (+24 V POWER).
Features
Type
Consumption
Low level
High level
Protections
Figure 4.15 : Connection of the override push-buttons
The following reversed connection is recommended for a better failure resistance
+24Vdc
0.5A
P/B1
18
(+)
(+)
15
0V
107004-15 EN FR26 ROW 0899 Printed in France
P/B1 & P/B2 inputs
voltage free and without reference potential
10 mA/24 Vdc
2 mA max.
5 mA min.
galvanic insulation : 500 Vdc, reversed
polarity
17
(-)
FF-SRM
(-)
16
P/B2
67