Honeywell SYA14 Series, Manual

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62 107004-15 EN FR26 ROW 0899 Printed in France
4.7.2 FSDs monitoring loop (terminals 26-27)
The FSDs monitoring loop is provided by the RESTART input. (see chapter 4.8.2).
The Normally Closed contacts of the two FSDs relays K1 and K2 or FF-SRE extension
module must be connected in series between terminals 26-27 to check correct operation of
the FSDs each time the OSDs outputs switch. If a failure of the FSDs relays K1 and K2 or
FF-SRE extension module is detected, the OSDs outputs remain open until the failure is
removed.
IMPROPER EXTERNAL SAFETY RELAYS PERFORMANCE
•
Use two independent stop circuit safety relays K1 and K2 with mechanically linked
contacts (such as GE CR120 BP Machine Tool Relay or Telemecanique CA3-KN31BD3 or
CA3-DN31BD relay) or FF-SRE extension module to reliably detect a welded contact.
•
Always use the FSD monitoring loop to check correct operation of relays K1 and K2.
Failure to comply with these instructions could result in death or serious injury
Figure 4.12 : Connection of the FSDs monitoring loop
Features RESTART input
Type voltage presence and without reference potential
Dynamic signal pic of 50 mA min.
NC contacts 50 Ohms max. resistance
Protections galvanic insulation : 500 Vdc
+24Vdc
FF-SRM
+24V
OUTPUT
32
OSD1
OSD2
25
FSD
K1 *
FSD
K2 *
2.5A
Machine
control
circuitry
K1
K2
27 26
RESTART
K1 K2
P/B3
8 2
0 V