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2. OPERATION
Class No. Symbol
10
SC3
Internal speed command 3:
Used to set speed 3 of internal speed commands.
Internal speed limit 3:
Used to set speed 3 of internal speed limits.
11
STA
Acceleration time constant:
Used to set the acceleration time required to reach the
rated speed from zero speed in response to the analog
speed command and internal speed commands 1 to 3.
Speed
Rated
speed
Zero
speed
Set 3000 (3s) to accelerate the HC-MF series servo
motor (rated speed: 3000r/min) from 0r/min to 1000
r/min in 1 second.
12
STB
Deceleration time constant:
Used to set the deceleration time required to reach
zero speed from the rated speed in response to the
analog speed command and internal speed commands
1 to 3.
13
STC
S-pattern acceleration/deceleration time constant:
Used to smooth start/stop of the servo motor.
Command
speed
Zero
speed
Name and Function
If the preset command speed is
lower than the rated speed,
acceleration/deceleration time
Parameter
No. 11 setting
Example
STC
STA
STC
STA: Acceleration time constant (parameter No. 11)
STB: Deceleration time constant (parameter No. 12)
STC: S-pattern acceleration/deceleration time con-
stant (parameter No. 13)
will be shorter.
Time
Parameter
No. 12 setting
Time
STC
STB STC
2– 36
Initial
Setting
Unit
Value
Range
1000
r/min
0 to instan-
taneous per-
missible
speed
ms
0 to 20000
0
0
ms
0
0 to 1000
Control
Mode
S
T
S • T
S • T
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