Mitsubishi Electric 800 Series Instruction Manual page 446

Online auto tuning at startup using the external terminal (setting value
"1", X28 signal and Y39 signal)
(Hz)
Output frequency
ON
X28 signal
Tuning status Completed
at starting
Tune
Y39 signal
Start signal
While the motor is stopped
ON
X28 Signal OFF
Tune
Tuning status
Completed
at starting
Secondary magnetic
flux exists a few seconds
ON
OFF
Y39 signal
Y39 signal is OFF when the motor is stopped
and X28 is turned OFF. However if the
secondary magnetic flux exists after motor stop,
the signal remains ON.
OFF
Start signal
While the X28 signal is ON
ON
X28 Signal OFF
Tuning is not performed at start since X28 signal
and Y39 signal is ON.
Tune
Tuning status
Completed
at starting
ON
OFF
Y39 signal
OFF
Start signal
Output
frequency
0Hz
• 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.
Time
• 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.
ON ON ON
Tune Tune
Completed
Completed
Secondary magnetic
flux exists a few seconds
ON ON
Tuning is not
performed if the
Y39 signal is ON.
Time
(C) Motor constant parameters
While the X28 signal is OFF
Tuning is performed at start when X28 signal is OFF
ON
(even when Y39 is ON).
X28 Signal
OFF
Tune
Tune
Tuning status
Completed
at starting
ON
Y39 signal
OFF
OFF
Start signal
Output frequency
0Hz
Switching motor
Motor
First motor
switching
RT signal
ON
OFF
X28 signal
Tune
Completed
Tuning status
at starting
ON
OFF
Y39 signal
ON
Start
OFF
signal
Output
frequency
0Hz
Tune
Completed Completed
Secondary magnetic Secondary magnetic
flux exists a few seconds flux exists a few seconds
Second motor
First motor
Y39 turns OFF when the
driven motor is switched
ON
to the second motor
Y39 turns ON due
Secondary magnetic
to the residual second
a few seconds
flux exists
magnetic flux at the
first motor.
PARAMETERS
Time
5
GROUP
Time
C
445