[Music]
hello
in today's video we are going to talk
about a TV 600 functions in particular
PID controller but before we begin we
would like to share with you what are we
going to do in next several videos so in
general it's going to be all about a TV
600 functions represented in two ways
basic in which we will explain functions
and go through parameters and also
advanced video putting parameters to
drive with so move and also doing a
practical example of this particular
function here on the screen you can see
10 topics which we will do and we will
begin with the first one because of two
reasons first it's the first one on the
list and second which is more logical
PID is mandatory for some other topics
like sleep wake up booster jockey pant
for example let's continue with PID
basic so what is PID regulator in a
drive it allows us to regulate some
external process like pressure flow
temperature etc using a variable speed
drive so what do we have in normal on or
let's say in average situation we have
variable speed drive to which we set
speed setpoint and the drive with its
own regulators is trying to keep the set
point speed on the motor if for example
we put this motor to certain pump in
water distribution system and we want to
maintain pressure we have a motor
connected to a pump and variable speed
drive connected to this motor then we
have to implement PID regulator because
variable speed drive can only see speed
setpoint or for example torque but not
the pressure
so input of PID regulator is a pressure
set point and output is a speed setpoint
additionally we have to connect the
feedback to a PID regulator which would
be the pressure sensor from our water
distribution system now let's go deeper
inside PID so we have two things on
input we have PID reference which we
have capability to ramp up and then
entering the summing point together with
feedback feedback you can scale
additionally now the first question is
how to activate PID regulator PID
regulator in the drive is automatically
activated when you assign a paid
feedback one important thing to say
the PID regulator inside the drive can
only work with variable speed drive
let's move on to scaling so technically
what you have to do is choose your
regulation arrange inside your practice
usually you will have certain pressure
sensor which can provide you big range
but sometimes you don't need this range
where you only using partial range of
regulation after that we have error
correction and the first stop of error
correction is possibility to make
inversion why would we need inversion
for example if you have some compressor
which is regulating the pressure then
you will not inverse error correction
but for example if you have some cooling
application where you need to increase
the speed of the fan if the temperature
for example go higher then you need to
inverse the error correction after that
we enter sleep wake up function which we
will do in separate video so for now we
will skip it and finally we are entering
PID regulator few words about PID
regulator it's a standard proportional
integration and derivation part inside
PID
regulator of which in majority of cases
we are only using proportional and
integral part of the PID additionally
there is a possibility to inhibit
integration of part 10 output of PID
regulator enters as additional summing
point and we will see why
but before entering the summing point we
can set certain limits of our PID output
and then additionally ramp up the PID
output now the summing point is for
predictive speed which we can scale and
ramp and why do we use this predictive
speed we use it to avoid certain
instabilities in our system especially
if we have certain speed range where we
can regulate and in between we don't
need PID regulator to work but just to
ramp up and ramp down from this range
and then output of the summing point
enters the drive additionally we can
disable or let's say make it out of
manual work of our PID output so we can
have manual speed reference which enters
the variable speed drive so one
important thing to say this is not
disabling the PID regulator but this is
only switching the output of PID
regulator to speed setpoint when you are
in manual mode PID regulator is still
working when you switch back to auto pay
the regulator takes the control of the
drive additionally what we can do is
supervise certain things inside PID
regulator using some of software or HMI
on a drive so we can supervise feedback
we can set certain limits of error or
warning and then we can supervise all
other values inside PID like error
correction output
reference and so on that's it for PID
regulator basic intro in next video we
will show you how to configure
drive to use a PID using some of
software and then make a practical
example on our pump demo bench thank you
and see you next video
[Applause]
[Music]