Delta Electronics VFD-M Series User Manual page 112

+
Targeted
value
-
Pr. 116
PID Feedback Terminal Selection
Settings 00
01
02
03
Select an input terminal to be the PID feedback. Please verify the PID feedback position is
different from the Frequency Set Point position.
Negative feedback = positive targeted value – detective value. Positive feedback = negative
targeted value + detective value.
Pr. 117
Proportional Gain (P)
Settings 0.0 to 10.0
This parameter determines the feedback loop Gain. If the gain is large, the response will be
strong and immediate (If the gain is too large, vibration may occur). If the gain is small, the
response will be weak and slow.
When I=0.0 and D=0.0, it is only used for proportional control.
Pr. 118
Integral Time (I)
Settings 0.01 to 100.00 sec
0.00 disable
This parameter determines the speed of response for the PID feedback loop. If the integral
time is long, the response will be slow. If the integral time is short, the response will be quick.
Be careful not to set (I) too small, since a rapid response may cause oscillation in the PID loop.
Revision May 2008, ME14, SW V3.04
P
I
Pr.118
Pr.117
D
Pr.119
LPF
Pr.135
Input positive PID feedback, PV from AVI (0 to 10V)
Input negative PID feedback, PV from AVI (0 to 10V)
Input positive PID feedback, PV from ACI (4 to 20mA)
Input negative PID feedback, PV from ACI (4 to 20mA)
+
+
Limit of PID
Upper Bound
Output
of Integral
Frequency
+
Value
Pr.120
Definition of
Detection Value
AVI( Pr.128~Pr.130
ACI( Pr.131~Pr.133
Chapter 4 Parameters|
One Time
Delay
Pr.121
Pr.122
Selection of
Detection value
)
Pr.116
)
Factory Setting: 00
Factory Setting: 1.0
Factory Setting: 1.00
Frequency
Command
Unit: 0.01sec
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