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6. PARAMETERS 
 
6.4.3 Stopping method when the forward stroke end (LSP) or reverse stroke end (LSN) is valid 
The setting of the first digit of parameter No.PD20 enables to select a stopping method of the servo motor 
when the forward rotation stroke end (LSP) or reverse rotation stroke end (LSN) turns off. 
Stopping method used when forward rotation stroke end (LSP) or 
reverse rotation stroke end (LSN) is valid
0: Sudden stop (home position erased)
1: Slow stop (home position erased)
2: Slow stop (Deceleration to a stop by deceleration time constant)
3: Sudden stop (Stop by remaining move distance clear)
Parameter No.PD20
 
Operation status 
Setting 
value of 
parameter 
No.PD20 
When rotating at constant speed 
When decelerating to stop 
Remarks 
(Initial 
value) 
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
 
Clears droop pulses 
and stops. 
Erases the home 
position. 
A difference occurs 
between the command 
position and the current 
position.  
Execute a home 
position return again. 
Amount of
droop pulse
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
Amount of
droop pulse
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
 
Moves for the amount 
of droop pulse and 
stops. 
Erases the home 
position. 
A difference occurs 
between the command 
position and the current 
position.  
Execute a home 
position return again. 
Decelerates to stop
Acceleration/
Deceleration
time constant
Acceleration/
Deceleration
time constant
S-pattern
acceleration/
deceleration
time constant
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
Continues
decelerating
to stop
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
 
Decelerates to stop at 
the deceleration time 
constant. Continues to 
rotate for the amount of 
S-pattern 
acceleration/decelerati
on time constant delay. 
Keeps the home 
position. 
Amount of droop
pulse
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
S-pattern
acceleration/
deceleration
time constant
amount of
droop pulse
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
LSP
or
LSN
Servo motor
speed
0r/min
ON
OFF
With S-pattern
acceleration/deceleration
Without S-pattern
acceleration/deceleration
Amount of
droop pulse
S-pattern
acceleration/
deceleration
time constant
amount of
droop pulse
 
Moves for the amount 
of droop pulse and 
stops. Continues to 
rotate for the amount of 
S-pattern 
acceleration/decelerati
on time constant delay. 
Keeps the home 
position.