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107031-33-EN FR26 GLO 1101 Printed in France
NOTICE
IMPROPER USE OF THE FF-SYA LIGHT CURTAIN
The cross-monitoring of the FF-SYA static outputs is based upon a self-checking principle which guarantees the
detection of an output short-circuit and the detection of a short-circuit between the outputs (cross-fault detection). The
FF-SRS59392 interface control module is primarily designed to be interfaced with Honeywell safety static outputs.
Compatibility with any other emergency stop relay module is not guaranteed.
4.6.2
Protection of Machine Stop Contacts
The OSSD1 and OSSD2 outputs must be protected by an external 1,5 A max. fuse. It is also recommended to connect
31 Vdc varistors in parallel with the FSD’s relay coils.
Use of RC circuits across the loads will prevent the light curtain from operating.
IMPROPER PROTECTION INSTALLATION
Never install varistors across the static safety output of the light curtain.
Always install varistors across the coils of the external safety relays.
Use fuses with the correct rating to protect the safety outputs.
Failure to comply with these instructions could result in death or serious injury
4.6.3
Connection to the machine control circuitry
It is necessary to connect the terminal 3 to the +24 V to energise the relays K1 and K2 through the OSSD1 and OSSD2
outputs. The switching capacity of the static output (0,5A/24 Vdc) combined with the number of available outputs displayed by
the equipment (2 Normally Open outputs) means that the equipment may be connected to two external relays with guided
contacts K1 and K2 (usually called « Final Switching Devices » - FSDs). These FSDs must be regularly controlled.
It takes 160 ms for the light curtain to restart after each beam release.
IMPROPER EXTERNAL SAFETY RELAYS PERFORMANCE
Use three independent stop circuit safety relays K1, K2 and K3 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
.
Failure to comply with these instructions could result in death or serious injury
The loads impedance allowed by the FF-SYA safety static outputs must be 55,2
Ω
minimum and 5 k
Ω
maximum. The turn-on
voltage must be greater than 5 V on resistive loads or greater than 7 V on inductive loads.
The maximum cable length between the FF-SYA static outputs and the loads mainly depends upon the loads resistance : the
cable length must be L
cable
≤
50000 / R
load
If the FF-SYA light curtain outputs are connected on safety relays with mechanically linked contacts, the maximum cable
length between the FF-SYA outputs and the relays is greater than 100 m.
If the FF-SYA light curtain outputs are connected to the FF-SRM muting module, the maximum cable length between the
FF-SYA outputs and the muting module is 50 m.
If the FF-SYA light curtain outputs are connected to the FF-SRS59392 safety control module, the maximum cable length
between the FF-SYA outputs and the control module is 50 m (for cable length greater than 10 m, use a cable with a
20 pF / m capacitance per unit length).
