KEYENCE SL-CHG Series - Manual (Page 35)

Chapter 3 Wiring
3-1
3
ENGLISH
3 Wiring
3-1 Wiring Methods
This section explains how to wire the SL-CHG 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-CHG (OSSDs for SL-CHG Series or FSDs for SL-R11G). 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.
WARNING
• Paragraph 9.1.4 of the IEC/EN60204-1 standard includes the following require-
ment.
Connecting a control device:
In control circuits with one side connected to a protective bonding circuit, one
terminal of the operating coil of each electro-magnetically operated device or one
terminal of any other electrical device shall be connected directly to that side of
the control circuit. All switching elements (e.g., contacts) of control devices that
operate the coil or the device shall be inserted between the other terminal of the
coil or device and the other side of the control circuit (i.e., the side that is not
connected to the protective bonding circuit).
The following exceptions are permitted:
• contacts of protective devices (e.g. overload relays) may be connected
between that side connected to the protective bonding circuit and the coils,
provided that the conductors between such contacts and the coils of the
control devices on which the relay contacts operate are in the same control
enclosure and the connection is so short and of a type that an earth fault is
unlikely;
• where the requirements of 9.4.3.1 are met
Accordingly, refer to the requirements described above before performing device
wiring when the target equipment is subject to the IEC/EN60204-1 standard. See
IEC/EN60204-1 for more information.
3-2 Power Requirements
1. Power Supply Units that can be used for the SL-CHG
Power Supplies that can be used for the SL-CHG Series and SL-R11G must completely satisfy the
following requirements in order to satisfy the requirements of IEC61496-1, UL61496-1, and
EN61496-1 for the SL-CHG and SL-R11G.
(a) Rated output voltage is 24V DC ±10%.
(b) The power supply to be used shall be dedicated for the SL-CHG and/or SL-R11G 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-CHG 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-CHG Series
and/or SL-R11G will be used.
(e) The output hold time is 20 ms min.