Answer / mugil

In Vibration Monitoring System -24V DC is using to Proximity sensor(Bently Naveda).
Because PNP transistor is used in this proximity sensor.The PNP transistor bsae voltage is negative 24v supply.That's why -24v DC supply is using.
When the probe is in air it will have no induced voltage
so all -24 voltage without induced voltage will return back.

Answer / asif.k64@hotmail.com

-24V DC is used for Telecom server and equipment, as positive terminal is grounded.

Answer / md. afroz alam

I am confuse tell me PNP using or NPN

Answer / pandu

mugil ji your answer is correct and one thing in plc, is it possible to use -24vdc

Answer / asif.k64@hotmail.com

In telecom Industry, Telecom devices use -24 Volts DC, as positive terminal is grounded.

Answer / mugil

Mr.Pandu,

-24V DC You can use in PLC also.Normally Phase and Neutral is using for +24VDC. but in -24 V DC case you should change the connection Phase to ground and Neutral to Phase.

Answer / md. afroz alam

Mugli ji I am confused with your answer using PNP transister or NPN transister tell me pls

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