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Chapter4 Wiring
F3SG-R
User’s Manual
Wiring/Installation
4-5-2. Power Supply Unit
For the F3SG-R 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 (24 V DC
± 20%)
• 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
• 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 Note below.)
• Must comply with laws and regulations, regarding EMC and electrical equipment
safety, of the country or region where the F3SG-R is used (For example, in EU, the
power supply must comply with the EMC Directive and the Low Voltage Directive.)
Note:
To prevent a fire, the secondary circuit of the power supply must satisfy either of the following
conditions in accordance with UL 508:
•As with secondary winding of isolation transformer, there must be a limited current voltage circuit to
which isolated power supply provides power, and the "current is limited to 8 A max. (including short-
circuit)" or "circuit protection such as a fuse is used to limit the current, which has a rating of 4.2A
max." (24 VDC power supply).
Recommended power supply: OMRON S8VS (30 W or 60 W) or S8VK-G (15W, 30W or 60W)
These products are UL-Listed (UL508, class 2 power supply), CE marking compatible (EMC/Low
Voltage Directive).
•Class 2 power supply unit complying with UL 1310, or a circuit using 2 transformers complying with
UL 1585 as a power supply.
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