User’s Manual 47
2. Expanded Functions
Control block diagram
1
TI⋅s
Differential limit
Derivative
Proportional
Integral
Differential ∆MVn
(η = 0.1)
MVS: Velocity → Position
MVn = MVn-1 ± ∆MVn
H/L: Upper / lower limit
DMV: Differential limit
MVCn
MVn
Manual
mode
Cascade
mode
Auto
mode
Digtal filter
MV
MMV
PVC
∆Dn
∆Pn
∆In
en
PVn
SVn
CSV
ASV
-
+
-
+
+
1
TD⋅s
1+η⋅TD⋅s
1
1+T⋅s
Gap KPMVS 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. → MVn = MVn-1 - ∆MVn
In Reverse mode, MV decreases when PV is increased. → MVn = MVn-1 + ∆MVn
Gap (dead-band) operation:
Error e
SV - PV
GP (%) GP (%)
Algorithm
Digital filter:
PV FT PVC FT PV
nn
=− ⋅ + ⋅ −
()11
Here,
0 000 0999..
≤≤
FT