Omron F3SJ Series Original Instructions Manual page 9

Perform an inspection for all F3SJ as described in "Chapter 6 Checklists". When using series
connections, perform inspections for every connected F3SJ.
For wiring
Connect the load between the output and +24V line (NPN output). Connecting the load between
the output and 0V line will result in a dangerous condition because operation is reversed to "ON
when blocked".
Do not short-circuit the output line to the 0V line. Otherwise, the output is always ON. Also, the
+24V of the power supply must be grounded so that output does not turn ON due to grounding of
the output line.
Configure the system by using the optimal number of safety outputs that satisfy the requirements
of the necessary safety category.
Do not connect each line of F3SJ to a DC power supply of more than 24VDC+20%. Also, do not
connect to an AC power supply. Failure to do so may result in electric shock.
For the F3SJ to comply with IEC 61496-1 and UL 508, the DC power supply unit must satisfy all
of the following conditions:
• Must be within the rated power voltage (24V DC
• Must have tolerance against the total rated current of devices if it is connected to multiple
devices
• Must comply with EMC directives (industrial environment)
• Double or reinforced insulation must be applied between the primary and secondary circuits
• Automatic recovery of overcurrent protection characteristics (reversed L sagging)
• Output holding time must be 20ms or longer
• Must satisfy output characteristic requirements for class 2 circuit or limited voltage current
circuit defined by UL508. Refer to p.158 for details.
• Must comply with laws and regulations, regarding EMC and electrical equipment safety, of the
country or region where the F3SJ is used (Ex: In EU, the power supply must comply with the
EMC Directive and the Low Voltage Directive.)
Double or reinforced insulation from hazardous voltage must be applied to all input and output
lines. Failure to do so may result in electric shock.
Extension of the cable must be within a specified length. If it isn't, safety function may not work
properly, resulting in danger.
±
20%)
E
F3SJ-A
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User's Manual