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7-2
Precautions
Power Supplies
Publication 700-UM002A-EN-D - July 2001
For the power supply of an input device of the 700-HX, use an isolating
transformer with the primary and secondary windings mutually isolated and
the secondary winding not grounded.
Circuit
Make sure that the voltage is applied within the specified range, otherwise the
internal elements of the Timer may be damaged.
Do not touch the input terminals while power is supplied. The 700-HX has a
transformer-less power supply and so touching the input terminals with power
supplied may result in electric shock.
When turning the power ON and OFF, input signal reception is possible,
unstable, or impossible as shown in the diagram below.
Power
ON
supply
OFF
200 ms 0 to 50 ms
Input
Impossible
Unstable
Turn the power ON and OFF using a relay with a rated capacity of 10 A
minimum to prevent contact deterioration due to inrush current caused by
turning the power ON and OFF.
Apply the power supply voltage through a relay or switch in such a way that
the voltage reaches a fixed value immediately, otherwise they may not be reset
or a timer error may result.
Be sure that the capacity of the power supply is large enough, otherwise the
Timer may not start due to inrush current (approx. 5 A) that may flow for an
instant when the Timer is turned on.
Make sure that the fluctuation of the supply voltage is within the permissible
range.
700-HX
H5CX
Input
Input
terminal
Power supply
terminals
Isolation transformer is required.
0 to 500 ms
5 ms
Possible
Unstable
Impossible
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