Appendix 1 - Hitachi J300U Series Instruction Manual

Appendix 1 Manual for New Functions
1. Autotuning
[Outline of the function]
This is a function for automatically setting the motor circuit constant necessary for the sensorless
vector.
When the autotuning function is performed by a motor which is designed according to JIS C
4210 and then the sensorless vector is controlled, even a motor (Hitachi general purpose motor)
whose constant is unknown at an output frequency of 1 Hz can generate a torque of 150%.
An Hitachi general purpose motor is given a constant which is a default value. Therefore, in
every case, the characteristics will be obtained without trouble. When the characteristics cannot
be obtained, measure the motor circuit constant by the autotuning function.
Autotuning starting method
Connect the motor.
Turn the autotuning mode
ON. (Note)
Turn the Run command ON.
(1) AC excitation (The motor does not rotate.)
(2) DC excitation (The motor does not rotate.)
(3) The motor is accelerated up to 80% of the
base frequency and then decelerated and
stopped. (The motor rotates.)
(4) The motor is accelerated up to 40% of the base
frequency and then decelerated and stopped.
(The motor rotates.)
(4-1) Measurement (acceleration/deceleration)
time t
t < 50 seconds - - - a = 40
2
50 t < 100 seconds - - - a = 20
2
100 t < 300 seconds - - - a = 10
After the measurement ends, the motor is stopped.
Select the control method. Select the motor data.
Standby state
(1) Before executing the autotuning function,
make sure the following set values.
1) a) Base frequency
b) Motor capacity
c) No. of motor poles
Set the values according to a motor
which uses a, b, and c.
2) Make sure that 0 Hz is not set. (When 0
Hz is set, the autotuning function will
not be performed.)
3) Cancel all the DC braking settings. (DC
braking is not set by initialization.)
4) Make an motor input voltage setting
(F-03 AVR AC
motor rating.
(2) Drive the motor for about 60 to 120 sec-
onds. (During autotuning, the motor auto-
matically runs in the order of (1) to (4) given
on the left and the motor constant is meas-
ured. Therefore, make sure before starting
operation that no problems are caused to the
load to be connected during the automatic
running from (1) to (4).)
Example:
When the base frequency is 120 Hz, the
motor runs up to 80% of the base frequency
in (3), that is, 96 Hz and then decelerates
and stops.
The status for using the autotuning data is
set.
Running under sensorless vector control is
available.
A-1
) according to the