Toshiba PROSEC T3H - Manual (Page 49)

User’s Manual
47
2. Expanded Functions
Control block diagram
1
T I
⋅ s
Differential limit
Derivative
Proportional
Integral
Differential ∆ MV n
( η = 0.1)
MVS: Velocity → Position
MV n = MV n-1
± ∆
MV n
H/L: Upper / lower limit
DMV: Differential limit
MVC
n
MV n
Manual
mode
Cascade
mode
Auto
mode
Digtal filter
MV
MMV
PVC
∆ D n
∆ P n
∆
I n
e
n
PV
n
SV
n
CSV
ASV
-
+
-
+
+ 1
T D
⋅ s
1+ η⋅ T
D
⋅ s
1
1+T ⋅ s
Gap K P MVS H/L DMV
DSV
DMMV
Integral
control
Integral action control:
When MV is limited (H/L, DMV) and the integral value has same sign as limit over, integral action
is stopped.
Velocity
→
Position conversion:
In Direct mode, MV increases when PV is increased.
→
MV
n
= MV
n-1
-
∆
MV
n
In Reverse mode, MV decreases when PV is increased.
→
MV
n
= MV
n-1
+
∆
MV
n
Gap (dead-band) operation:
Error e
SV - PV
GP (%) GP (%)
Algorithm
Digital
filter:
PV FT PVC FT PV n n
= − ⋅ + ⋅
− ( ) 1 1
Here,
0 000 0 999 . .
≤ ≤
FT