GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 283)

DV-300 Adjustable Speed Drives
——— FUNCTION DESCRIPTION ———
6
155
Input/output
Set Analog input 1 as input for the cursor of the dancer potentiometer.
Analog input 1 / Select input 1= PID Feed-back
Set Analog input 2 as line speed input (feed- forward).
To set the feed-forward on analog input, seeing that this one is not directly accessible in the list of high-priority
parameters, it is necessary to pass through a supporting parameter PAD 0.....PAD 15.
Analog input 2 / Select input 2 = PAD 0
Set Digital input 1 as enabling input of PI block of the PID
Digital input 1 = Enable PI PID
Set Digital input 2 as enabling input of PD block of the PID
Digital input 2 = Enable PD PID
parameters
Set Speed base value equal to the rated speed of the motor.
Speed base value = 3000rpm
Set PID source as PAD 0.
(PAD 0 has been used as supporting parameter for the feed-forward reading on Analog input 2)
For PID source, set the parameter number to which it will be associated, choosing it from the list of paragraph
10.4. “List of high-priority parameters’ (PAD 0 has the decimal number 503).
To obtain the correct value it must be added to the decimal number 8192 (fixed offset):
PID source = (8192 + 503) = 8695
Set PID source Gain so that Feed-fwd PID reaches, along with the max. analog value on Analog input 2, 85%
of its max. value = 10000 x 85%.
When an analog input is set on a PAD parameter, this will have a max. value +/- 2047.
So:
PID source Gain = (max Feed-fwd PID x 85%) / max PAD 0 = (10000 x 0.85) / 2047 = 4.153
Set PID target as Speed ref 1.
n
ote
: When the ramp function is enabled, Speed ref 1 is not available. In order to keep it avail-
able, it is necessary to set the parameter Enable ramp = Disable.
PID target must be set to the parameter number to which it will be associated, choosing it from the list of para-
graph 10.4, “List of high-priority parameters” (Speed ref 1 has the decimal number 42).
To obtain the correct value it must be added the decimal number 8192 (fixed offset)
PID target = 8192 + 42 = 8234