Honeywell SYA14 Series Manual page 311

FF-SM Series Installation Manual
Final Switching Devices (FSD) K1 and K2
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.
The limited switching capacity of internal relays, combined with the number of available
contacts displayed by the equipment (2NO+1NC contacts) means that most of the time the
equipment must be electrically interfaced to the machine circuitry through at least two external
safety relays K1 and K2. See figure 3-3. Their features (switching capacity and number of
contacts) will depend upon the machine stopping circuitry. These external safety relays are
sometimes called Final Switching Devices and their correct operation must be continuously
monitored or checked.
Figure 3-3 External Safety Relays Connection
Connection of One Control Unit
(1)
K1
FSD
K3
B1
FF-SM
control unit
B2
(1) : RC (220Ω + 0,22 µF) for AC interfaces or varistors for DC interfaces
For application help: see Warranty Information
Dual channel
machine control circuit
(recommended circuit)
Phase
(DC+)
Fuse Fuse
K1 K1
K2 K2
K3 K3
C1
Neutral
(DC-)
OR
Single channel
machine control circuit
Phase
C2
(DC+)
Fuse
K1
K2
K3
K2
(1)
K3
K2
FSD
Neutral
(DC-)
Honeywell • PK 107007-01 EN FR26 GLO 0298 Printed in France 37
Phase
(DC+)
Fuse
(1)
K1
FSD
K1 K3
A4 A1 B1 C1
FF-SM C4
control unit
Signalling
(relay status)
(or jumpered)
internal B3
fuse
A5 A2 B2 C2
K3 K2
(1)
K2
FSD
Neutral
(DC-)
See page 42 for full size schematic.
Connections and Setup
Dual channel
machine control circuit
(recommended circuit)
Phase
NO P/B
(DC+)
Fuse Fuse
K1 K1
K2 K2
K3 K3
K1
K3
Neutral
(DC-)
Optional test
OR
input
K2
Single channel
machine control circuit
Phase
(DC+)
Fuse
K1
K2
(1)
K3
K3
Neutral
(DC-)