SMC Networks EX500 Technical Instruction Manual page 4

EX500 Serial System
・ ・ ・ ・ Safety instructions for power supply
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CAUTION
1. Whether you use a single power supply or a dual power supply, two power lines have to be supplied
at all times ( for solenoid valve and for input and control ).
2. Choose UL recognized product for direct current power source to be mounted.
( 1 ) Limited voltage / current circuit complying with UL508
The power supply circuit made with the secondary winding of an isolating type transformer which satisfies
the following condition.
･ Max. voltage ( No load applied ) : 30Vrms ( 42.4V peak ) or less, and
･ Max. current : 8A or less ( Including a short circuit ), and restricted by the circuit protective device or
a fuse with rating in the table below
Open circuit volts ( V peak )
Over 20 [ V ] to 30 [ V ]
* " V " is defined as the peak open circuit voltage.
( 2 ) Max. 30Vrms ( 42.4V peak ) or less circuit ( Class 2 circuit ) which is supplied by an isolating source
that complies with the requirements in the Standard for Class 2 Power Units, UL1310 or for Class 2
Transformers, UL1585.
0 to 20 [ V ]
Amperes
5.0
100
V *
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EX## - OME0008