GE Industrial Solutions DV-300 DC Drive Users Manual User Manual
Page 268
GEI-100332Ga
——— FUNCTION DESCRIPTION ———
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2. Programming example of the analog input 2 on PID source:
a)
Input programming on a PAD parameter
Menu I/O CONFIG
————> Analog input
————> Analog input 2
————> Select input 2 = PAD 0
b)
Setting of the PAD 0 as feed-forward input:
Menu OPTION
————> PID
————> PID source
————> PID source = 8695
The PID source must be set to the parameter number to which it will be associated, choosing it from paragraph
10.4 “List of high-priority parameters’ (PAD 0 has the decimal number 503).
To obtain the value must be added the decimal value 8192 (fixed offset):
8192 + 503 = 8695.
The full-scale of the feed-forward is limited to the value +/- 10000, which depends on the parameter set on PID
source. It will be necessary the calibration through PID gain source.
The measure units are those indicated in the notes at the end of the paragraph 10.4. “List of the high-priority
parameters”.
The feed-forward value can be read through the parameter Feed-fwd PID via keypad or serial line.
Referring to the above examples
:
1. Programming example of the ramp output block (Parameter Ramp out) on PID source:
Speeds will be converted inside the drive into RPM x 4.
The ramp input references take as maximum set value what set in Speed base value.
Feed - fwd PID = Speed base value x 4 x PID source gain
If, with max. ramp reference and Speed base value = 3000rpm, to have
Feed - fwd PID = 10000, it is necessary to set:
PID source gain = 10000 / (3000 x 4) = 0.833
2. Programming for example analog input 2 on PID source:
When an analog input will be set on a PAD parameter, this will have a max. value of + / - 2047.
With max. analog reference, for having Feed - fwd PID = 10000, it is necessary to set:
PID source gain = 10000 / 2047 = 4.885.
n
ote
!
Using the regulator as “generic PID” without the feed -forward function, Feed - fwd PID
must be at its max. value.
To do this, it is necessary to set PID source on a PAD parameter and program it = 10000.