5.4 Details of Function Codes
5-248
d70
Speed Control Limiter
Applying the limiter to the PI calculation output of the speed control system is possible by the V/f control with
the speed sensor and the dynamic torque vector control with the speed sensor.
In general, the PI calculation output is within "slip frequency x maximum torque (%)" in a normally controlled
state.
If an abnormal state such as a temporary overload arises, the PI calculation output greatly fluctuates and
may take a long time to return to the normal state. Limiting the PI calculation output suppresses such
abnormal operation.
Setting range: 0 to 100 (%) (assuming the maximum frequency as 100%)
d82
Magnetic State Weakening Control (Vector Without Speed Sensor)
When this function code is set to "1" (effective), the motor flux is controlled according to the command
torque.
When the command torque is small, weak the motor flux, and improve the control stability.
d83
Magnetic State Weakening Lower Limit (Vector without Speed Sensor)
This function code is applied to the lower limit of the motor flux when the function code d82 data = 1 is set.
When the value of this function code is set too small, problems such as hunting and speed stagnation may
occur.
Use with the default setting "40%" unless otherwise there are problems.
d86
Acceleration/deceleration Filter Time Constant (See F07)
For detailed descriptions of acceleration and deceleration filter time constant, see the section describing the
function code F07.
d90
Magnetic State Level of Deceleration (Vector Control)
This function code is applied to the magnetic flux level in decelerating in the vector control.
The set unit is "%" of the motor rated magnetic flux determined by P06/A20/b20/r20.
This function code is effective only when H71 = 1 (deceleration characteristic effective) and F42/A14/b14/r14
= 5 or 6 (vector control with/without the speed sensor).
When this function code is set large, the deceleration time can be shortened. However, the output current
and motor temperature increase get large. In case applications that repeatedly start and stop frequently, the
inverter and motor may get overloaded.
Adjust this function code so that the equivalent RMS becomes smaller than the motor rated current.
Use with the default setting "150%" unless otherwise there are problems.
d99
Extension Function 1
When the jogging operation
JOG is set effective from the communication, set this function code to bit 3 = 1.
The function codes other than bit 3 are for manufacturers. Do not change the setting.
To Next Page
Loading...
