gefran VDI100 Series Instruction Manual page 214

Please confirm parameter 04-00 conform the need (0V~10 V or 4mA~20 mА) if AI2 as PID target or PID
feedback. And switch SW2 from control board to the input type (V or I), please refer to ch. 3.8 General Wiring
Diagram for more detail.
When 10-03= xxx1b: PID is enabled, LCD keypad will be switched automatically (16-00) and main screen
monitoring displays PID target value (12-38). Sub-screen monitoring 1 (16-01) displays PID feedback value
(12-39) and sub-screen monitoring 2 (16-02) displays frequency output (12-17). If PID is disabled, the keypad
will switch automatically to frequency command setting as the main page.
When 10-03= xx1xb: PID output is reverse. PID output is chosen to reverse, and if PID input is negative, the
output frequency of PID will gain. On the contrary, PID output is chosen to forward, and if PID input is minus,
the output frequency of PID will decrease.
Refer to Fig. 4.4.78 & 4.4.79 when 10-03= x1xxb: feedback value differential of PID control and 10-03= x0xxb:
basic PID control
When 10-03= 0xxxb: PID output, it corresponds 100% to the frequency of 01-02. When 10-03= 1xxxb: PID
output + frequency command, it will cumulate the output percentage of frequency command, (corresponding to
01-02 main frequency command set by parameter 00-05/ 00-06) at the beginning of running and then start PID
control.
Code Parameter Name / Range
10-04 Feedback gain
0.01~10.00
10-05 Proportional gain (P)
0.00~10.00
10-06 Integral time (I)
0.0~100.0 s
10-07 Differential time (D)
0.00~10.00 s
10-09 PID bias
-100~100 %
10-10 PID Primary delay time
0.00~10.00 %
10-14 PID integral limit
0.0~100.0 %
10-23 PID limit
0.00~100.0 %
10-24 PID output gain
0.0~25.0
10-25 PID reversal output selection
0: Do not allow the reversal output
1: Allow the reversal output
10-26 PID target acceleration / deceleration time
0.0~25.5 s
PID Adjustments
Gain control: The error signal (deviation) between the input command (set value) and the actual control value
(feedback). This error signal or deviation is amplified by the proportional gain (P) to control the offset between
the set value and the feedback value.
Integral control: The output of this control is the integral of the error signal (difference between set value and
feedback value) and is used to minimize the offset signal that is left over from the gain control. When the inte-
gral time (I) is increased, the system response becomes slower.
214
VDI100 • Instruction manual