Vector Control
11
CFW700 | 11-7
11.5 TORQUE CONTROL
In vector control modes sensorless or with encoder, it is possible to use the inverter in torque control mode instead
of using it in speed control mode. In this case the speed regulator must be kept saturated and the imposed torque
value is defined by the torque limits in P0169/P0170.
Performance of the torque control:
Vector control with encoder:
Torque control range: 10 % to 180 %.
Accuracy: ± 5 % of the rated torque.
Sensorless vector control:
Torque control range: 20 % to 180 %.
Accuracy: ± 10 % of the rated torque.
Minimum operating frequency: 3 Hz.
When the speed regulator is positively saturated, i.e., forward speed direction defined in P0223/P0226, the value
for the torque current limitation is adjusted in P0169. When the speed regulator is negatively saturated, i.e., reverse
speed direction, the value for the torque current limitation is adjusted in P0170.
The torque at the motor shaft (T
motor
) in % is given by the formula:
(*)
The equation below must be used for “+” torque. Replace P0169 by P0170 for “-“ torque.
P0401 x P0169
(*)
x K
100
(P0401)
2
- P0410 x P0178
2
100
x 100
T
motor
=
Where:
N
nom
= motor synchronous speed,
N = motor current speed
K =
1
for
N
≤
P0190 x N
nom
P0400
N
nom
x P0190
for
N
> P0190 x N
nom
N
P0400
P0400
NOTE!
For torque control in the sensorless vector mode (P0202=4), observe:
The torque limits (P0169/P0170) must be higher than 30 % to assure the motor starting. After the
start and with the motor rotating above 3 Hz, they can be reduced, if necessary, to values below
30 %.
For torque control applications with frequencies until to 0 Hz, use the vector with encoder control
mode (P0202=5).
In the vector with encoder control type set the speed regulator for the mode “optimized for torque
control” (P0160=1), besides keeping it saturated.
NOTE!
The motor rated current must be equivalent to the CFW700 rated current, in order that the torque
control has the best possible accuracy.
Summary of Contents for CFW700
Page 2: ......
Page 4: ......
Page 8: ...Summary...
Page 34: ...2 General Information 2 4 CFW700...
Page 38: ...3 About the CFW700 3 4 CFW700...
Page 56: ...7 Starting up and Settings 7 4 CFW700...
Page 58: ...8 Available Control Types 8 2 CFW700...
Page 78: ...10 VVW Control 10 8 CFW700...
Page 158: ...13 Digital and Analog Inputs and Outputs 13 28 CFW700...
