Honeywell SYA14 Series Manual page 52

4.5 Machine Stop contacts (Receiver terminals 4 and 5)
Features Machine Stop Contacts
Type static DC (Normally Open contacts)
Switching capacity 0.5 A/24 Vdc
Voltage drop
< 2 Vdc
Protections short-circuits, overloads, reversed polarity, micro-cutoff (4.5 ms)
NOTICE
POWER CUTOFF PROTECTION
The FF-SYA failsafe static outputs withstand 4.5 ms power cutoff. The use of the optional
AC to DC power supply improves the power cut of resistance up to 20 ms.
4.5.1 Permanent Self-checking (Monitoring)
Fail-safe static outputs OSSD1 and OSSD2 (Output Signal Switching Devices) 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
internal or external short-circuit of one of the two outputs will immediately bring about the
opening of the other output. A internal or external 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
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-SRS5939 interface control
module is primarily designed to be interfaced with Honeywell fail-safe static outputs.
Compatibility with any other emergency stop relay module is not guaranted.
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107031-23 EN FR26 GLO 1199 Printed in France