8. Keep wiring as short as possible.
<Solid state>
Be sure to use a wire length 100m or less.
When the wire length is long, we recommend the ferrite core should be attached to the both ends of
the cable to prevent excess noise. A contact protection box is not necessary for solid state switches
due to the nature of this product construction.
9. Do not use a load that generates surge voltage.
<Solid state>
If driving a load such as a relay that generates a surge voltage, use a built-in surge absorbing element
type device.
10. Pay attention to the internal voltage drop of the auto switch.
<Solid state>
Generally, the internal voltage drop of the solid state auto switch is larger than that or the reed auto
switch. When the auto switches (“n” pcs.) are connected in series, the voltage drop is multiplied by “n”.
In this case, the auto switches operate correctly, but the loads may not operate. Additionally, note that
the 12 VDC relay does not apply to the auto switch.
11. Pay attention to leakage current.
<2-wire type>
Current (leakage current) flows to the load to operate the internal circuit even when in the OFF state.
Operating current of load (OFF condition)
>
Leakage current
If the criteria given in the above formula are not met, it will not reset correctly (stays ON).Use a 3-wire
switch if this specification will not be satisfied.
Moreover, leakage current flow to the load will be
“n” times larger when “n” auto switches are
connected in parallel.
12. Output operation of the solid state auto switch is not stable for 50 [ms] after powered ON.
In the output operation immediately after powered ON or AND connection operation, the input device
(PCL or relay, etc.) may judge the ON position as OFF output or the OFF position as ON output. So,
please make the setting on the equipment so that the input judgement signal is set disabled for 50 [ms]
immediately after
powered ON or AND connection. When using SMC’s AHC system (Auto Hand
Changing System) Series MA, please also make this setting.
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2020-10-13 10:43
DI987004
