Mitsubishi Electronics MR-J2S- A instruction manual Stb, Stc

5. PARAMETERS

Class No. Symbol

9SC2

10 SC3

11 STA

parameters	12	STB
	13	STC
Basic

		Name and function					Initial	Unit	Setting	Control
							value		range	mode
Internal speed command 2							500	r/min	0 to	S
Used to set speed 2 of internal speed commands.									instan-
									taneous
Internal speed limit 2									permi-	T
Used to set speed 2 of internal speed limits.									ssible
									speed
Internal speed command 3							1000	r/min	0 to	S
Used to set speed 3 of internal speed commands.									instan-
									taneous
Internal speed limit 3									permi-	T
Used to set speed 3 of internal speed limits.									ssible
									speed
Acceleration time constant							0	ms	0	S T
Used to set the acceleration time required to reach the rated speed									to
from 0r/min in response to the analog speed command and internal									20000
speed commands 1 to 7.			If the preset command speed is
Speed			lower than the rated speed,
			acceleration/deceleration time
Rated
					will be shorter.
speed
Zero						Time
speed
	Parameter			Parameter
	No.11 setting			No.12 setting
Example: For the servo motor of 3000r/min rated speed, set 3000 (3s)
to increase speed from 0r/min to 1000r/min in 1 second.
Deceleration time constant							0
Used to set the deceleration time required to reach 0r/min from the
rated speed in response to the analog speed command and internal
speed commands 1 to 7.
S-pattern acceleration/deceleration time constant							0	ms	0	S T
Used to smooth start/stop of the servo motor.									to
Set the time of the arc part for S-pattern acceleration/deceleration.									1000
Command speed
	Speed Servo motor

0r/min					Time
STC	STA	STC	STC	STB	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)

Long setting of STA (acceleration time constant) or STB (deceleration time constant) may produce an error in the time of the arc part for the setting of the S-pattern acceleration/deceleration time constant.

The upper limit value of the actual arc part time is limited by

2000000 for acceleration or by	2000000	for deceleration.
STA	STB

(Example) At the setting of STA 20000, STB 5000 and STC 200, the actual arc part times are as follows:

Limited to 100[ms] since

During acceleration: 100[ms]	2000000		100[ms]	200[ms].
	20000
During deceleration: 200[ms]		200[ms] as set since
		2000000	400[ms]	200[ms].
		5000

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