MD380 User Manual Desc
ription of Function Codes
- 227 -
Function Code Parameter Name Setting Range Default
A0-05
Forward maximum frequency
in torque control
0.00 Hz to maximum
frequency (F0-10)
50.00 Hz
A0-06
Reverse maximum frequency
in torque control
0.00 Hz to maximum
frequency (F0-10)
50.00 Hz
two parameters are used to set the maximum frequency in forward or reverse rotation in
torque control mode.
In torque control, if the load torque is smaller than the motor output torque, the motor's
rotational speed will rise continuously. To avoid runaway of the mechanical system, the
motor maximum rotating speed must be limited in torque control.
You can implement continuous change of the maximum frequency in torque control
dynamically by controlling the frequency upper limit.
Function Code Parameter Name Setting Range Default
A0-07 Acceleration time in torque control 0.00–65000s 0.00s
A0-08 Deceleration time in torque control 0.00–65000s 0.00s
In torque control, the difference between the motor output torque and the load torque
determines the speed change rate of the motor and load. The motor rotational speed may
change quickly and this will result in noise or too large mechanical stress. The setting of
acceleration/deceleration time in torque control makes the motor rotational speed change
softly.
However, in applications requiring rapid torque response, set the acceleration/deceleration
time in torque control to 0.00s. For example, two AC drives are connected to drive the same
load. To balance the load allocation, set one AC drive as master in speed control and the
other as slave in torque control. The slave receives the master's output torque as the torque
command and must follow the master rapidly. In this case, the acceleration/deceleration
time of the slave in torque control is set to 0.0s.
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