FF-SM Series Installation Manual
Connections and Setup
For application help: see Warranty Information
Honeywell
•
PK 107007-01 EN FR26 GLO 0298 Printed in France 37
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
FF-SM
control unit
K3
K3
K2
(1)
K2
FSD
(1)
K1
FSD
B2
B1
C2
C1
OR
Single channel
machine control circuit
Phase
(DC+)
Neutral
(DC-)
Dual channel
machine control circuit
(recommended circuit)
Phase
(DC+)
Neutral
(DC-)
Fuse
K1
K2
K3
Fuse
K1
K2
K3
Fuse
K1
K2
K3
K1
K3
K3
K2
Phase
(DC+)
Neutral
(DC-)
NO P/B
K1
K2
K3
Fuse
(1)
K3
(1)
K2
FSD
(1)
K1
FSD
FF-SM
control unit
B2
C4
B3
B1
C2
Optional test
input
(or jumpered)
Signalling
(relay status)
A2
A1
C1
internal
fuse
A4
A5
OR
Single channel
machine control circuit
Phase
(DC+)
Neutral
(DC-)
Dual channel
machine control circuit
(recommended circuit)
Phase
(DC+)
Neutral
(DC-)
Fuse
K1
K2
K3
Fuse
K1
K2
K3
Fuse
K1
K2
K3
(1) : RC (220
Ω
+ 0,22
µ
F) for AC interfaces or varistors for DC interfaces
See page 42 for full size schematic.
Summary of Contents for SYA14 Series
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