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Speed control by Real sensorless
vector control, vector control
4
PARAMETERS
(6) Set a torque limit value during acceleration and deceleration individually (Pr. 816, Pr. 817 )
⋅ You can set torque limit during acceleration and deceleration individually.
The following chart shows torque limit according to the settings of Pr. 816 Torque limit level during acceleration and Pr.
817 Torque limit level during deceleration.
(7) Setting increments switchover of the torque limit level (Pr. 811 )
⋅ By setting "10, 11" in Pr. 811 Set resolution switchover, the setting increments of Pr. 22 Torque limit level and Pr. 812 to
Pr. 817 (torque limit level) can be switched to 0.01%.
(8) Change the torque characteristics in the constant power range (Pr. 803)
REMARKS
⋅ The internal resolution of the torque limit is 0.024% (100/2
12
) and the fraction less than the resolution is rounded off.
⋅ When the torque limit setting increments have been changed (0.1%⇔0.01%), reset is necessary because the settings of Pr. 22
and Pr. 812 to Pr. 817 are multiplied by 1/10 (ten times).
For example, when 10 (0.01%) set in Pr. 811 is changed to 1 (0.1%) with Pr. 22 = 150.00%,
Pr. 22 = 1500.0% and the maximum torque is 400%.
⋅ The fraction less than the resolution equivalent to 0.1% is rounded off even if "10 or 11" is set in Pr. 811 when Real sensorless
vector control is selected.
⋅ Refer to page 251 for switchover of speed setting increments.
⋅ You can select whether the torque limit in the constant
power range be constant torque limit (setting is "1") or
constant power limit (initial value is "0"), using Pr. 803
Constant power range torque characteristic selection under
torque limit operation.
Acceleration
Constant speed
Deceleration
Set
frequency
Output
frequency
(Hz)
Time
Torque limit level
1s
Pr. 816
Torque limit level during acceleration
Pr. 22
Torque limit level
Pr. 817
Torque limit level during deceleration
After the state where
difference between the
set speed and running
speed is within ±2Hz has
persisted for 1s, torque
limit level during
acceleration / deceleration
(Pr. 816 or Pr. 817) shifts to
torque limit level during
constant speed (Pr. 22).
Speed
Base speed
Torque
Pr. 803 =1:
constant torque limit
Pr. 803 =0:
constant power limit
(torque reduction)
Constant power range
Constant torque range