Honeywell SYA14 Series Manual page 316

Connections and Setup
Physical Configuration and Wiring Diagram Examples (cont'd)
IMPROPER EXTERNAL SAFETY RELAYS PERFORMANCE
• Use three independent stop circuit safety relays with mechanically linked contacts to reliably
detect a welded contact.
• Use fuses with the correct rating to protect the safety contacts.
Failure to comply with these instructions could result in death or serious injury.
IMPROPER ARC SUPPRESSORS INSTALLATION
• Never install an arc suppressor across the safety output contact of the control unit.
• Always install arc suppressors across the coils of external safety relays.
Failure to comply with these instructions could result in death or serious injury.
Figure 3-8 Wiring Diagram Using Additional External Safety Relays (Area Controlled by
Two Safety Mats Run by a Single Control Unit)
Phase
(DC+)
Fuse
A4
FF-SM
control unit
(relay status)
A5
Neutral
(DC-)
(1) RC (220Ω + 0,22 µF) for AC interfaces or varistors for DC interfaces.
NO P/B : normally open contact of a push button; press and release the push button.
42 Honeywell • PK 107007-01 EN FR26 GLO 0298 Printed in France
(1)
K1
FSD
K1 K3
A1 B1 C1
Signalling
internal
fuse
A2 B2 C2
K2
K3
(1)
K2
FSD
FF-SM Series Installation Manual
NO P/B
K1
C4
Optional test
input
K2
(or jumpered)
B3
(1)
K3
For application help: see Warranty Information
Dual channel
machine control circuit
(recommended circuit)
Phase
(DC+)
Fuse Fuse
K1 K1
K2 K2
K3 K3
K3
Neutral
(DC-)
OR
Single channel
machine control circuit
Phase
(DC+)
Fuse
K1
K2
K3
Neutral
(DC-)