what is Potential free contact? where it is used?
Answers were Sorted based on User's Feedback
Answer / abdelrahman
Potential free contacts (also called "dry contacts") are
simply contacts which are physically operated with the main
device, but not electrically connected to it. For example a
motor contactor often has auxiliary contacts that are
operated by the main coil and open and close at the same
time as the main contacts but are not used for control of
the motor starter. If they are connected to an outside
circuit to indicate the status of the starter without being
powered by the motor supply they would be considered
potential free contacts.
These type also called Signal-Contacts.
In case of relays and switches if the common/pole is
connected internally to a given potential like a 110V phase
etc., the contact is not POTENTIAL FREE but if both the
common and the normall open (and at time also the normally
closed) contacts are presented to the user for connecting
in his system as he pleases,the contact is said to
be "potential-free".
Is This Answer Correct ? | 23 Yes | 7 No |
Answer / amit
Potential free contacts are simply contacts which are physically operated with the main device, but not electrically connected to it
Is This Answer Correct ? | 16 Yes | 7 No |
Answer / mithilesh kumar
in Potential free contact cable not present voltage.
but it's also depends upon resistance.
in this cable are in line then this 1-2 ohm resistance is
permissible.
any comment u welcome.
good luck
Is This Answer Correct ? | 2 Yes | 11 No |
An atmospheric storage tank has a diameter of 20 m and a height of 8m.It is half-full of liquid with the remainder of the space containing air normally at atmospheric pressure. If the connection to atmosphere is accidentally closed off and 10 cubic m of liquid removed, what happens to the internal pressure of the tank? What are the possible consequences for the tank?
Where do we consider the pressure in mbar & where do we consider the pressure in bar & why is it so ?
2 Answers BOC, Jindal Steel and Power,
what is lead lag compensator and for wat v using that???
In most instances, Inertia processes are quite uncommon. Give an example of a combined Resistance and Capacitance situation.Describe an application, which according to your understanding of the subject matter, comprises of both Resistance and Capacitance effects.
whey we conect ammeter in series and voltmeter in parallel in circuit
how to do dynolab wind speed sensor loop test, how to simulate value,i have simulate mA 4-20mA but not responding in DCS faceplate, please kindly advice me any one.
I am applied 100 % pressure on to the air to open control valve,but the valve is not fully closed..and 10-15% is open the valve. how to calibrate the control valve?
what r all the type of viberation measurement measuring in turbin? what's the output of viberation sensor?
why do we use 4-20 ma current why cant o-20ma
What is the difference between PLC and DCS?
What is maintenance planning?
open tank and close tank leavel transmiter about range and calibration