YASKAWA Varispeed G7 Series Instruction Manual page 532

Control Block Diagram for Open-loop Vector 2 Control
Frequency
reference
d2-01
U1-01
E1-09
Speed
reference
fref
Stall prevention processing
(deceleration rate correction)
-44
10
Acceleration and
deceleration times
d2-03
to
ASR input
SFS output
Feedforward
U1-21
U1-20
control
−
f0
+
Soft starter
−
+
fnfb
L3-04
Torque limit
selection circuit
Fig 10.26 Control Block Diagram for Open-loop Vector 2 Control (A1-02 = 4)
Drooping
Torque reference tro
Torque limit
(Integral
L7-01
L7-04
to
short-circuit)
IRST
N5-01
+
1
ASR
1+ST
+
C5-06
C5-01
U1-22
ASR output
C5-04
+
E1-04
+
Field forcing
E1-13
d6-03
V/f
pattern
*
+
fs
Slip frequency
calculation
+
U1-09
C6-11
φ *
×
*
iq
Inverter
*
id
Vector
IM
calculator
E2-03
Speed
*
e
calculator
Output
frequency
fout
U1-02
Motor
excitation
current
U1-19
idfb
iqfb
U1-18
Motor secondary current
IM