GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 284)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
156
Set PID out scale so that , the max. analog value on Analog input 2 (Feed-fwd PID = 8500) and Enable PI
PID and Enable PD PID = Disable, Speed ref 1 is the same at 2550rpm.
The parameter Speed ref 1 will set in RPM x 4, so:
PID out scale = (2550 x 4) / 8500 = 1.2
Set PI central v sel = 1.
Set PI central v 1 = 1
In absence of a correction performed by the PI block of the regulator, the line speed reference (Feed-forward)
must be multiplied by 1 and sent directly to the speed regulator of the drive.
In this application, the regulator carries out a mono type proportional control. The correction will be indicated
in percentage, according to the line speed, from 0 to the maximum.
Set PI top limit and PI bottom limit so that, with max. of the dancer (max.value of the analog input 1 = PID
Feed-back) and setting the proportional gain of the PI block at 15%, it will correspond to an equal proportional
correction of feed-forward. For this reason set:
PI top limit = 10
PI bottom limit = 0.1
Set PI P gain PID = 15%
Set PI I gain PID = 0%
With this configuration, having a correction proportional to the line speed, the PI block is not able to position the
dancer at speed = 0. In order to do the drawing in stop conditions, it is necessary to use the PD block.
Set PD P gain PID to a value that allows positioning of the dancer without large dynamic variations.
For example:
PD P gain PID = 1%
If necessary, use the derivative component as damping component of the system, setting for example:
PD D gain PID = 5%
PD D filter PID = 20ms
If not necessary, keep these parameters = 0.
If it is necessary to carry out a reference cascade for another drive, set PID output on an analog output, for
example:
Analog output 1 / Select output 1= PID output
(with Real FF PID = 10000 count, Analog output 1 = 10V).