KEYENCE SL-C Series - Manual (Page 37)

Chapter 3 Wiring
3-1
3
ENGLISH
3 Wiring
3-1 Wiring Methods
This section explains how to wire the SL-C Series components.
WARNING
• When using the PNP output, do not short-circuit the control output cable (OSSD)
to +24V. Otherwise, the output will always remain ON, which is dangerous.
• When using the NPN output, do not short-circuit the control output cable (OSSD)
to 0V. Otherwise, the output will always remain ON, which is dangerous.
• When using the PNP output, connect the load between the control output
(OSSD) and 0V. If it is erroneously connected between the control output
(OSSD) and +24V, the OSSD does not operate normally and is turned ON when
the beams are blocked. This is very dangerous.
• When using the NPN output, connect the load between the control ouput (OSSD)
and +24V. If it is erroneously connected between the control output (OSSD) and
0V, the OSSD does not operate normally and turns ON when the beams are
blocked. This is very dangerous.
• Always build a safety system using both of the control output systems provided in
the SL-C (OSSDs for SL-C Series and for SL-R11E, or FSDs for SL-R11). If a
safety system is built using a single control system only, it is not possible to stop
the machine when the control output system fails. This may result in serious
harm, such as serious injury or death of the machine operator.
• Regardless of whether the cables are PNP or NPN type, you must fulfill the
requirements of Clause 9.4.3 in IEC60204-1: 2005 for protection against
maloperation due to earth fault.
3-2 Power Requirements
1. Power Supply Units that can be used for the SL-C
Power Supplies that can be used for the SL-C Series must completely satisfy the following
requirements in order to satisfy the requirements of UL61496-1 for the SL-C.
(a) Rated output voltage is 24V DC ±10%.
(b) The power supply to be used shall be dedicated for the SL-C and shall not be used to supply
power to other devices.
(c) The power supply output must satisfy the requirements for a Class 2 Circuit or Limited Voltage/
Current Circuit as prescribed by UL508. (This requirement applies only when the SL-C is to be
used in North America.)
(d) The power supply must comply with the regulations, and standards covering electrical -safety,
electromagnetic compatibility (EMC), etc., for the country or region in which the SL-C Series will
be used.
(e) The output hold time is 20 ms min.