MITSUBISHI ELECTRIC FR-S520 - Manual (Page 111)

102
Parameter Name
Factory
Setting
Setting
Range
Remarks
88
PID action
selection
20 20, 21
89
PID proportional
band
100%
0.1 to 999 %,
- - -
90 PID integral time 1s
0.1 to 999s,
- - -
91 PID upper limit - - -
0 to 100%,
- - -
92 PID lower limit - - -
0 to 100%,
- - -
93
PID action set
point for PU
operation
0% 0 to 100%
94
PID differential
time
- - -
0.01 to 10s,
- - -
Setting is enabled when Pr. 30 = "1"
(1) Basic PID control configuration
+- IM
Kp: Proportion constant Ti: Integral time S: Operator Td: Differential time
Set point
Manipulated
variable
Motor
Feedback signal (Process value)
Inverter circuit :
Ti S
1
1+ +Td S Kp
PID operation
Terminal 4
Pr. 93 or Treminal 2
(2) PID action overview
1) PI action
A combination of proportional control
action (P) and integral control action (I)
for providing a manipulated variable in
response to deviation and changes
with time.
REMARKS
PI action is the sum of P and I actions.
[Operation example for stepped
changes of process value]
Deviation Set point
Process value
Time
Time
Time
PI action
I action
P action