Mitsubishi Electric FR-F800 Series Instruction Manual page 402

 Online auto tuning at startup using the external terminal (Pr.95/Pr.574 =
"1", X28 signal, 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 in order to minimize the startup delay by tuning at start.
• Perform offline auto tuning and set "1" (tuning at start) in Pr.95.
• When the Start time tuning completion (Y39) signal is OFF, tuning at start can be performed with the X28 signal.
• The tuning takes about 500 ms at the most.
• To use the X28 signal, set "28" in any parameter from 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 parameter from Pr.190 to Pr.196 (Output
terminal function selection) to assign the function to an output terminal.
Output frequency
X28 signal
Tuning status
at starting
Y39 signal
Start signal
While the motor is stopped
X28 Signal OFF
Tuning status
at starting
OFF
Y39 signal
OFF
Start signal
While the X28 signal is ON
X28 Signal
OFF
Tuning status
at starting
OFF
Y39 signal
OFF
Start signal
Output
frequency
0Hz
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(Hz)
ON
Completed
Tune
ON ON
Tune Tune
Completed Completed
Secondary magnetic Secondary magnetic
flux exists a few seconds flux exists a few seconds
ON ON
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.
ON
Tuning is not performed at start since X28 signal
and Y39 signal is ON.
Tune
Completed
ON
search engine
Time
While the X28 signal is OFF
ON ON
X28 Signal
Tune
Tuning status
Completed
at starting
ON
Y39 signal
Tuning is not
performed if the
Y39 signal is ON.
Start signal
Output frequency
0Hz
Switching motor
Motor
switching
RT signal
X28 signal
Tuning status
at starting
Y39 signal
Start
signal
Output
frequency
Time
Tuning is performed at start when X28 signal is OFF
ON (even when Y39 is ON).
OFF
Tune
Tune
Completed
Completed
Secondary magnetic
flux exists a few seconds
ON
OFF
OFF
Second motor
First motor
ON
OFF
Tune
Completed
ON ON
OFF
Secondary magnetic
ON
flux exists a few seconds
OFF
0Hz
5.10 (C) Motor constant parameters
1
2
3
4
5
6
7
8
9
Tune
Completed
10
Secondary magnetic
flux exists a few seconds
Time
First motor
Y39 turns OFF when the
driven motor is switched
to the second motor
Y39 turns ON due
to the residual second
magnetic flux at the
first motor.
Time
401
5. PARAMETERS