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PARAMETERS
201
Selection and protection of a motor
(3) Start-time online auto tuning from external terminal (X28 signal, Y39 signal)
· By turning ON the start-time tuning signal (X28) before the
start signal (STF or STR) turns ON (at a stop), online tuning
is performed and a starting delay after start signal turns ON
due to tuning can be avoided.
· Perform offline auto tuning and set "1" (start-time tuning) in
Pr. 95.
· When the start-time tuning completion signal (Y39) is OFF,
start-time tuning with the X28 signal is performed.
· Start-time tuning ends within 500ms maximum.
· When using the X28 signal, set "28" in Pr. 178 to Pr. 189
(input terminal function selection) and assign functions to the
input terminal.
· When using the Y39 signal, set "39 (positive logic) or 139
(negative logic)" in Pr. 190 to Pr. 196 (output terminal function
selection) and assign functions to the output terminal.
REMARKS
· Start-time tuning is performed when the start signal is turned ON during zero speed control also.
· The Y39 signal is in ON status while secondary magnetic flux exists after the motor stop.
· While the Y39 signal is ON, the X28 signal is not valid.
· The STF, STR signals are valid after completion of the start-time tuning.
· The following output terminals (initial value) are valid during online auto tuning:
IPF, A1B1C1
· Tuning is invalid during V/F control.
CAUTION
· Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) or Pr. 190 to Pr. 196 (output terminal
function selection) may affect the other functions. Set parameters after confirming the function of each terminal.
Time
X28signal
Tuning status
at starting
Y39signal
Start signal
Tune
Completed
ON
(Hz)
Output frequency
X28 Signal
Tuning status
at starting
Y39 signal
Start signal
Output
frequency
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
Tune
Completed
Completed
ON
Tune
CompletedCompleted
ON
Secondary magnetic
flux exists
a few seconds
Secondary magnetic
flux exists
a few seconds
Secondary magnetic
flux exists
Secondary magnetic
flux exists
a few seconds
Secondary magnetic
flux exists
a few seconds
ON
0Hz
0Hz
ON
Tune
ON
Tune
ON
Tune
ON
ON
Tune
Completed Completed
Tune
Completed
Completed
ON
ON
Tune
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.
Tuning is not
performed if the
Y39 signal is ON.
Tuning is performed at start when X28 signal is OFF
(even when Y39 is ON).
Tuning is not performed at start since X28 signal
and Y39 signal is ON.
Time
Time
X28 Signal
Tuning status
at starting
Y39 signal
Start signal
Output frequency
X28 Signal
Tuning status
at starting
Y39 signal
Start signal
Switching motor
Start
signal
Output
frequency
OFF
0Hz
Time
Y39 signal
OFF
OFF
ON
X28 signal
Tuning status
at starting
Motor
switching
RT signal
ON
First motor
Second motor
First motor
ON
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.
ON
a few seconds
While the X28 signal is OFFWhile the motor is stopped
While the X28 signal is ON