(C) Motor constant parameters
When performing the online auto tuning at start for a lift, consider utilization of a brake sequence
function for the brake opening timing at a start or tuning using the external terminal. The tuning is
completed in approximately 500 ms at the maximum after the start. Not enough torque may be
provided during that period. Caution is required to prevent the object from dropping. Use of the
start-time tuning start (X28) signal is recommended to perform tuning. (Refer to page 5-466.)
Perform online auto tuning at startup when the motor is stopped.
The online auto tuning is disabled when the MRS signal is being input, the setting speed is Pr. 13
"Starting frequency" or lower (V/F control, Advanced magnetic flux vector control), an inverter
fault is occurring, or the inverter's startup condition is not satisfied.
Online auto tuning does not operate during deceleration and restart from DC injection brake
It is disabled during JOG operation.
If automatic restart after instantaneous power failure is selected, automatic restart is prioritized.
(Online auto tuning at startup does not run during frequency search.)
If automatic restart after instantaneous power failure is used together, perform online auto tuning
while stopping operation with the X28 signal. (Refer to page 5-466.)
Zero current detection and output current detection are enabled during online auto tuning.
No RUN signal is output during online auto tuning. The RUN signal is turned ON at operation
If the time between the inverter stop and restart is within 4 s, tuning is performed at startup but its
result will not not applied.
Online auto tuning at startup using the external terminal
(setting value "1", X28 signal and Y39 signal)
● Before turning ON the start signal (STF or STR), online auto tuning can be performed by turning
ON the Start-time tuning start external input (X28) signal in a stopped status. Such operation will
minimize the startup delay by turning at start.
● Perform offline auto tuning and set Pr. 95 = "1" (tuning at start).
● When Start time tuning completion (Y39) is OFF, tuning at start can be performed with X28 signal.
● Up to 500 ms can be taken to complete tuning at startup.
● To use the X28 signal, set "28" in any of Pr. 178 to Pr. 189 (Input terminal function selection) to
assign the function to an input terminal.
5 - 466