Honeywell SYA14 Series, Manual

Page: 313 / 737

FF-SM Series Installation Manual Connections and Setup
For application help: see Warranty Information Honeywell
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PK 107007-01 EN FR26 GLO 0298 Printed in France 39
Final Switching Device (FSD) Monitoring
Overview
Monitoring a machine control system requires two machine primary control elements. British
Standards define an element as an “…electrically powered element which directly controls the
machine’s normal operating motion in such a way that it is last (in time) to operate when
motion is initiated or arrested.” (BS 6491: Part 1 (2.8): 1984). Element types vary based on
the method of arresting the hazardous motion. If the element is a relay, it must be a captive
(positive-guided) contact type. The secondary control element is defined as “a machine
control element independent of the machine primary control element(s) and capable of
removing the source of power from the prime mover of the relevant dangerous parts in an
emergency.” (BS 6491: Part 1 (2.9): 1984)
Final switching device monitoring allows the control circuitry to regularly and automatically
check the external safety relays K1 and K2 (connected to the equipment outputs) after each
activation of the safety mat. See figure 3-5. After deactivation of the mat sensor, the control
unit will automatically restart and the safety outputs (normally open contacts) will close. If
safety relays K1 and K2 are operating correctly, the activation of the restart push button will
first energize safety relay K3 and then the final switching devices K1 and K2. After release of
the push button, the safety relay K3 will de-energize allowing the next machine operation.
Figure 3-5 Final Switching Device (FSD) Monitoring Connection
NO P/B
K1
K2
K3
(1)
K3
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)
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
Signalling
(relay status)
A2
A1
(1) : RC (220
Ω
+ 0,22
µ
F) for AC interfaces or varistors for DC interfaces
See page 42 for full size schematic.