Honeywell SYA14 Series Manual page 593

4.7 Connection to the machine control circuitry
4.7.1 OSD1 and OSD2 outputs (terminals 8 & 25)
Fail-safe static outputs OSD1 and OSD2 are switched simultaneously. An internal permanent
self-check (monitoring) verifies that both static outputs always have the same status. If one of the
two outputs remains accidentally closed, the remaining output would no longer be able to close.
Similarly, a possible short-circuit of one of the two outputs will immediately bring about the
opening of the other output. A short-circuit between the two outputs will also lead to the opening
of the ligth curtain outputs. It is therefore important to use the two outputs to prevent
operation of the machine.
IMPROPER USE OF THE MACHINE STOP CONTACTS
Always use the two fail-safe outputs to control the machine movement.
Failure to comply with these instructions could result in death or serious injury.
It is necessary to connect the terminal 32 to the +24V to energize the relays K1 and K2 through
the OSD1 and OSD2 outputs.The 2 OSD's static outputs must be connected to 2 external
relays with guided contacts K1 and K2 on FF-SRE extension module (usually called " Final
Switching Devices " - FSDs) to be interfaced to the machine control circuitry. The FSDs must be
regularly controlled. Correct operation of the FSDs relays is checked at each module restart
(see chapter 4.7.2).
IMPROPER EXTERNAL SAFETY RELAYS PERFORMANCE
•
U
se 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 to reliably detect a welded contact or FF-SRE extension module.
•
Always use the FSD monitoring loop to check correct operation of relays K1 and K2 (See
chapter 4.7.2 FSD monitoring loop).
Failure to comply with these instructions could result in death or serious injury.
107004-15 EN FR26 ROW 0899 Printed in France 59