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Motor brake and stop operation
4
PARAMETERS
4.14.3 Stop selection (Pr. 250)
Use this function to select the stopping method (deceleration to a stop or coasting) when the start signal turns
OFF. Use this function to stop the motor with a mechanical brake, etc. together with switching OFF of the start
signal.
You can also select the operations of the start signals (STF/STR). (Refer to page 236 for start signal selection)
Parameter
Number
Name Initial Value Setting Range
Description
Start signal (STF/STR)
(Refer to page 236)
Stop operation
250 Stop selection 9999
0 to 100s
STF signal: Forward
rotation start
STR signal: Reverse
rotation start
The motor is coasted to a
stop when the preset time
elapses after the start
signal is turned OFF.The
motor is coasted to a stop
(Pr. 250 - 1000)s after the
start signal is turned OFF.
1000s to 1100s
STF signal: Start signal
STR signal: Forward/
reverse signal
9999
STF signal: Forward
rotation start
STR signal: Reverse
rotation start
When the start signal is
turned OFF, the motor
decelerates to stop.
8888
STF signal: Start signal
STR signal: Forward/
reverse signal
(1) Decelerate the motor to a stop
⋅ Set Pr. 250 to "9999" (initial value) or "8888".
⋅ The motor decelerates to a stop when the start
signal (STF/STR) turns OFF.
(2) Coast the motor to a stop
⋅ Use Pr. 250 to set the time from when the start signal
turns OFF until the output is shut off. When any of
"1000" to "1100" is set, the output is shut off after
(Pr. 250 − 1000)s.
⋅ The output is shut off when the time set in Pr. 250
has elapsed after the start signal had turned OFF.
The motor coasts to a stop.
⋅ The RUN signal turns OFF when the output stops.
REMARKS
Stop selection is invalid when the following functions are activated.
⋅ Position control (Pr. 419 = 0)
⋅ Power failure stop function (Pr. 261)
⋅ PU stop (Pr. 75)
⋅ Deceleration stop because of fault definition (Pr. 875)
⋅ Deceleration stop because of communication error (Pr. 502)
⋅ Offline auto tuning (with motor running)
⋅ Emergency stop by L
ONWORKS communication
When setting of Pr. 250 is not 9999 nor 8888, acceleration/deceleration is performed according to the frequency command, until
start signal is OFF and output is shutoff.
CAUTION
⋅ When the start signal is turned ON again during motor coasting, the motor starts at Pr. 13 Starting frequency.
♦ Parameters referred to ♦
Pr. 7 Acceleration time , Pr. 8 Deceleration time Refer to page 172
Pr. 13 Starting frequency Refer to page 175
Time
ON
OFF
Start
signal
Deceleration starts
when start signal turns OFF
Deceleration time
(Time set in Pr. 8, etc.)
DC brake
Output frequency
(Hz)
ON
OFF
RUN
signal
OFF
ON
Start signal
Output is shut off when set
time elapses after start signal
turns OFF
Pr.250
Motor coasts to stop
Time
O
FF
RUN signal
Output frequency
(Hz)
ON