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2-3-1 Power supply
DC power supply units must satisfy all of the conditions below;
•
The power supply voltage must be within specified ratings (24 VDC ± 10 %).
•
The power supply uses double or reinforced insulation between the primary
and secondary circuits
•
The power supply automatically resets overcurrent protection characteristics
(voltage drop).
•
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 of Class 2 Circuit of
Limited Voltage-Current Circuit as defined in UL508 (see "Remark").
•
The power supply must conform to regulatory requirements and standards,
regarding EMC and electrical equipment safety, of the country where the F3SP
is installed and where machinery will be operated. Example: The EMC
Directive (industrial environment) and the Low Voltage Directive in EU.
[Remark] The power supply must conform to the following requirement (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. And, 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 24VDC)
Recommended power supply: S82K (15 W, 30 W, 50 W, 90 W type) made by
(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.
Section 2 Wiring and Mounting
WARNING
OMRON.
9
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