Eaton ELC-PB, Programming Manual

Page: 431 / 728

E L C P r o g r a m m i n g M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003003E
3-262
Notes and suggestion:
1.
S
3
+ 3 can only be in the range 0 ~ 30,000.
2. When the three main parameters are adjusted, K
P
, K
I
and K
D
(
S
3
+ 4 = K0 ~ K2), adjust K
P
first
and reset K
I
and K
D
to 0. When the output can roughly be controlled, proceed to increase K
I
and K
D
(see example 4 below for adjustment methods). K
P
= 100 refers to 100%, i.e. the
proportional gain to the error is 1. K
P
< 100% will decrease the error and K
P
> 100% will
increase the error
3. When the temperature auto-tuning function is selected(
S
3
+ 4 = K3, K4), it is suggested to
store the parameters in D registers in the latched area to prevent the adjusted parameters
from being cleared when the controller is powered down or when it is placed in program mode.
There is no guarantee that the adjusted parameters are suitable for every control requirement.
Users can modify the adjusted parameters according to specific needs, but it is suggested to
modify only K
I
or K
D.
4. The PID instruction has to be controlled with many parameters; therefore care should be taken
when setting each parameter to prevent the PID operation from going out of control.
Example 1:
Block diagram for positioning application (
S
3
+4 = 0)
PID
MV
Encoder
PV
Position instruction
(SV)
Controlled
device
Example 2:
Block diagram for an AC motor drive application (
S
3
+4 = 0)
PID
S+MV
Speed instruction (S)
Acceleration/deceleration
instruction (SV)
Acceleration/deceleration
output (MV)
Actual acceleration/
deceleration speed
(PV = S - P)
AC motor
drive
Speed
detection
device (P)