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F3SG-SR
User’s Manual
Chapter5 Wiring
Wiring and Installation
E
5-4-2. Power Supply Unit
For the F3SG-SR to comply with IEC 61496-1 and UL 508, the DC power supply unit
must satisfy all of the following conditions:
• The DC power supply operates within the rated power voltage (24 VDC ± 20%).
• The DC power supply has tolerance against the total rated current of devices if it is
connected to multiple devices.
• The DC power supply complies with EMC directives (industrial environment).
• Double or reinforced insulation is applied between the primary and secondary circuits.
• The DC power supply has an automatic recovery type of overcurrent protection
characteristics.
• Output holding time is 20 ms or longer.
• The DC power supply satisfies output characteristic requirements for class 2 circuit or
limited voltage current circuit defined by UL 508. (Refer to Note below.)
• The DC power supply complies with laws and regulations, regarding EMC and electrical
equipment safety, of the country or region where the F3SG-SR 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 S8VK-S (30 W or 60 W)
These products are UL-Listed (UL 508, 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.
Sharing the power supply with other devices may cause the F3SG-SR/PG to be affected by noise or voltage drop. It is
recommended that the F3SG-SR/PG use a dedicated power supply, not shared with other devices.
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