I have joystick in hyd oil system ,

[Krahim4]

I have joystick in hyd oil system ,contact point are connected in series and parallel with 1K ohm resistance .why ?

 

[ScottyUK]

Looks like active monitoring of the switch circuit to detect open and short-circuit control cores.

 

[Skogsgurra]

The word Trennschaltverstärker means "Isolating Switch Amplifier" and, as Scotty says, probably needs two distinct impedances to work reliably. BTW, the resistors are 1 and 10 kiloohms. That makes for a better ON/OFF ratio than the 1k+1k mentioned.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[Krahim4]

in case of safety PLC yes but this is normal hard relay control,no self diagnostic system .

 

[Skogsgurra]

Sorry to be of such little use. But a system working with oil may need an isolation amplifier. And the one used here needs the two resistors for reliable operation. Have a look at the specifications for the system.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.