GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 278)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
150
PID target
[782] PID target
[773] PID out scale
Parameter description No.
Value
Standard
Configuration min max
Factory
American
Factory
European
PID target 782 0 65535 0 0
PID out scale 773 -100.000 -100.000 1.000 1.000
PID target Address of the parameter which contains the value to be used as PID target. To obtain
the real settable value, it is necessary to add +2000H (8192 decimal) to the parameter
number.
PID out scale Matching factor of PID output. Its value depends on the parameter to which the regula-
tor output is addressed.
Through the parameter PID target it is possible to select which point of the drive will be addressed for output
signal of the regulation. The selectable parameters are those assigned as writing parameters (W or R/W) indi-
cated in the paraghraph 10.4. “List of high-priority parameters’”. The units are those indicated in the notes at
the end of the paragraph.
Programming example of the speed reference 1 (parameter Speed ref 1) on PID target:
Menu OPTION
————> PID
————> PID target
————> PID target = 8234
PID target must be set according to the number of the parameter to which it will be associated, choosing it from
the paragraph 10.4. “List of high-priority parameters’” (Speed ref 1 has the decimal number 42). To obtain the
value it must be added the decimal number 8192 (fixed offset):
8192 + 42 = 8234.
n
ote
: When the ramp function has been enabled, Speed ref 1 will be automatically programmed
on its output. To have it available it is necessary to set parameter Enable ramp = disable.
Speed ref 1 will be set in RPM x 4, considering that PID output assumes values included between 0....10000,
it is necessary to set appropriately the calibration through PID out scale.
Calculation of PID out scale:
If it is necessary that PID output, at its max. value = 10000, corresponds at speed reference = 2000rpm it is
necessary to set:
PID out scale = (2000 x 4) / 10000 = 0.8
It is possible to read the set value of Speed ref 1 in the appropriate parameter of the menu INPUT VARIABLES
/ Speed ref.
n
ote
: The value of PID out scale will be defined according to the system which is being controlled.
For a better understanding, please refer to the paragraph “Application examples”.