PID does not return any output...

Hello everyone...

process sbRIO on board and using the audio and vibration Simulator

below I have attached my RT + FPGA... code to control the speed of the fan... using PID...

RT. front panel

set range

1000, -1000

set point... 5000 RPM (speed is the parameter)

PID GAINS...

the values calculated at the time of the executin arbitraty... KC = 1, gain full (Kc * Ts/Ti) = 0.011718,.

derivative gain (Kc * Td/Ts) = 0

other considerations

Maximum speed of the fan is 6000 RPM

tachometer on the vibration signal Simulator is 2 impulses/turns

the speed is measured accurately

Manual disturbance can be given by varying the analog output voltage

If the pid is introduced into RT it works fine...

but, when the pid (in fpga) is introduced not able to disturb and also not output to

all other parameters is reset (final rpm, out outputanalog)

all equal to zero

This data set is meaningless... I suggest that you check that you actually save the correct values, and you have the wired PID controller correctly upward.

There are times when (?) heated, but the speed does not change. Also there are times where speed (?) has a step increase, but there is no change in voltage. You can also see places where 5V is applied but different speeds are generated. Of course, it would be much clearer if you labeled your data, including units.

Open-loop can the system actually achieve 4000 rpm with the applied 5volts? Try to start with a set point which is at the centre of its work.

The ramps are integral single action? What gains have used here. You should try proportional only first of all, make sure that everything is working properly and then only start watching full action.

Tags: NI Software

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