In field side transmitter voltage droping here no loose connection then what will happen?
Answers were Sorted based on User's Feedback
The minimum required loop voltage depends on the voltage needed to drive 20ma (or 21.5mA if fail-safe high is used) through the total loop resistance.
Even if the power supply voltage sags/drops slightly, it is still possible that the loop will function properly, because it depends on the actual loop resistances and the lift-off voltage required by the transmitter
If there is not sufficient loop voltage, it will become apparent when the transmitter fails to go above a certain milliamp output, because there is insufficient voltage to drive more current through the loop's total resistance.
In some cases of low loop voltage, a field transmitter will cycle on and off, re-initializing each time it fails to push sufficient current because it is voltage-starved.
If the loop wiring is sized properly, then a voltage drop is likely due to
- a bad connection in junction box
- in some cases a ground loop from damaged wire insulation
- adding too many additional loads - more transmitters than the power supply is rated for
- failing power supply
- adding another device in series in the loop, like an indicator, recorder, or I/O module input that pushes the total loop resistance too high. Carl Ellis
Measure First
Is This Answer Correct ? | 6 Yes | 0 No |
Answer / vinay
distance betwn. control rm. and transmitter may be larger or much as much recmmnd.
Sol:-
Use the amplifier or isolator in btwn them (rm. to tx.)
Is This Answer Correct ? | 4 Yes | 1 No |
What is hp & mp seperator .& what is its working principle ?
Why shield is not connected at both end.
for what purpose strain guage is used?
Anybody know how to create a ladder programme for power switch in TV remote without using counter... ie TV can be turn on and turn off using single push button switch... on pressing the switch first time TV turn on and hold the on state till i press the switch again, and after TV turn off.
how to caluculate flow by using transmitter?tell me plz I am eagerly waiting for your reply..
2 Answers Agi Glaspac, Reliance Power,
What is difference between “Fault Tolerant” & “Fault avoidance” PLC? Application where these system s are used?
What is the difference between compensation and extension cable.
Explain Split Range Control In Control Valve Briefly.
what is a device net.
How does work A temperature valve or fv control valve in process plz brief me
Identification of ss fittings, pilot valves, relief valve.
How to Calibrate Ultrasonic flow Transmitter in Field