6. Control Functions and Parameter Settings
6-75
6-7 Adjusting the vector control speed control related parameters
With the VAT2000, ASR operation is possible by executing automatic tuning and setting simple speed
control parameters. However, when carrying out high-response or high-accuracy control, the parameters
must be adjusted in detail. In this section, the configuration and adjustment parameters of the speed
control system is explained.
6-7-1 Speed control system for Induction Motors
The speed control system of VAT2000 is configured of blocks as shown below. Automatic tuning is used
for adjusting the exciting current control, current regulator, flux observer and speed estimation
mechanism, so these parameters often do not need to be adjusted. However, the parameters related to
the speed regulator, torque limit, load torque observer, various low path filters, etc., must be adjusted
according to the user's system. Thus, these cannot be simply adjusted with automatic tuning. The final
user of the system must adjust these parameters to match the system. Adjustments are carried out while
referring to the block diagram below.
LP F
LP F
LP F
LP F
B 3 0- 3
S p ee d
S e tting
B 3 0- 5
B 3 0- 6
E xciter
C u rr ent
C o ntrol
A 1 0- 0
A 3 0- 2
A 1 0- 0
A S R
P C o ntr ol
G a in
Tor que
Lim iter
I C on trol
G a in
+
-
A 1 0- 2
A 3 0- 2
A 1 3- 6
A 1 0- 3
B 3 1- 0
A 11-0
B 3 0- 0
A 1 0- 4
B 3 1- 1
A 11-1
B 3 2- 0
B 3 2- 2
A 1 0- 5
B 3 1- 2
D istu rb an ce
O b se rv er
Tor que
C o m m and
A 11-2
B 1 3- 7
B 3 0- 1
B 3 0- 7
A 11-3
B 3 2- 4
C u rr ent
D e te ction
B 3 3- x
B 3 4- x
B 3 0- 4
E stim ated
M o to r S pee d
D e te cte d
M o to r S pee d
Flu x
O b se rv er
& Sp ee d
E stim atio n
S e ns orless
Ve ctor C o ntro l
Ve ctor C o ntro l
w ith se nsor
M o to r
S p ee d
A C R
S p ee d
D e te ction
M
P P
LP F
+
+
+
+
+
+
-
-
Tor que
C u rr ent
VAT2000 speed control system block diagram
(Note)
The related parameter Nos. are indicated in the above function blocks.