F3S-B
27
2-3 Wiring
WARNING
Do not connect the F3S-B to a power supply with a voltage higher than 24 VDC + 20%.
Do not connect the F3S-B to an AC power source.
2-3-1 Power Supply Units and Loads
WARNING
DC power supply units must satisfy all of the conditions below so that the F3S-B can comply with the
applicable standards IEC 61496-1, and UL 508.
•
The power supply voltage should be within rating (24 VDC ± 20 %).
•
The power supply is connected only to the F3S-B and to the devices related to the electro-sensitive
protective function of the F3S-B, such as a safety controller and muting sensors, and it has enough
rated current for all the devices. The power supply is not connected to other devices or machines.
•
The power supply uses double or reinforced insulation between the primary and secondary circuits
•
The power supply has automatic reset characteristics (voltage drop) to protect overcurrent.
•
The power supply maintains an output holding time of at least 20 ms.
•
FG (frame ground terminal) must be connected to PE (protective earth) when using a commercially
available switching regulator.
•
The power supply must have output characteristics required for the power source for Class 2 Circuit
or Limited Voltage/Current Circuit as defined in UL508 (see “Remark”).
•
The power supply must conform to regulatory requirements and standards, regarding EMC and elec-
trical equipment safety, of the country where the F3S-B is installed and where machinery will be op-
erated, for example: The EMC Directive (industrial environment) and the Low Voltage Directive in
EU.
[Remark] The power supply must conform to the following requirements (1) or (2) regarding a secondary
circuit, in accordance with UL 508, to avoid a fire.
(1) The power supply includes a limited voltage/current circuit supplied by an isolating source like
the secondary winding of an isolating type transformer. In the limited voltage/current circuit,
- the current available is limited to a value not exceeding 8 A (including the case of
short-circuit), or
- a secondary fuse or other such secondary circuit protective device used to limit the
available current shall be rated at not more than a value 4.2 amperes (for the power
supply voltage of 24 VDC).
(2) The power supply includes a Class 2 circuit supplied by an isolating source that complies
with the requirement in the Standard for Class 2 Power Units, UL 1310, or the requirements
in the Standard for Class 2 and Class 3 Transformers, UL 1585.
Recommended power supply: S82K (15 W, 30 W, 50 W, 90 W type) made by OMRON, UL Listed (UL508,
Class2 Output) and CE Marked (EMC and Low Voltage Directives)
Power supply and loads must be reinforced insulated or double insulated as shown in the following figure
to protect against electrical shock. The insulation shown in the figure should insulate against hazardous
voltage levels (230 VAC, etc.), not simply against 24 VDC.
Emitter
Receiver
Relay monitoring input
0 V
+24 V
Output
0 V
+24 V
Power
supply unit
Reinforced
insulation or
double
insulation
k1
Reinforced insulation or double
insulation between the coil and
contacts, between contacts
K1
Motor, etc.
Hazardous
voltage level
k1
Hazardous voltage level
