Mitsubishi Electric 800 Series Instruction Manual page 373

NOTE
• When performing online auto tuning at startup for a lift, consider using an external terminal. The tuning is completed in at
most approximately 500 ms after starting. However, during this time, it is possible that not enough torque is provided and
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
• 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 operation.
• 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
• 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 startup.
• If the time between the inverter stop and restart is within 4 s, tuning is performed at startup but its result will not be 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.
• To use the Y39 signal, set "39 (positive logic) or 139 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal function
selection) to assign function to an output terminal.
372
5. PARAMETERS
5.10 (C) Motor constant parameters
page 372.)
(Hz)
Output frequency
ON
X28 signal
Tuning status
at starting
Tune
Y39 signal
Start signal
Time
Completed
page 372.)