WEG CFW100 - Page 68

8
MOTOR CONTROL
U
d
m
ixr
+
+
P138 P137
P202 = 0 (V/f)
P142 P143 P136
P146 P145
f f
P142 P136
P145
P151
P151
P134 P133
f*
P100-P104
Zero
P135
f
slip
+
+
3ϕ
I
o
I
o
I
sh
I
v
,I
w
I
sh
PWM
I
a
m
f
o
P002
m P007
I
o
P003
U
d
P004
modulation
Space Vector
PWM
DC Link Regulation
P202 = 0 (control V/f)
or
P202 = 1 (quadratic V/f)
Curve V/f
P202 = 1
(Quadratic V/f)
MI
Power Supply
Angle,
sextant
Direction of rotation
Calculation of I
o
Calculation of I
a
Figure 8.12: Block diagram of V/f scale control
Micro Mini Drives | 8-19