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8-4. Linear Acceleration/Deceleration Drive
The linear acceleration/deceleration drive accelerates and decelerates according to the acceleration
and deceleration curves obtained by approximating the speed area from acceleration start to its end
and that from the deceleration start to its end by straight lines.
Setting different values in the acceleration and deceleration curve parameters causes asynchronous
linear acceleration/deceleration drive.
Continuous drive (SCAW drive) and positioning drive (IWDEX
drive) can be performed.
Execution sequence of linear acceleration/deceleration drive
■
Set drive
① Set the parameters required for linear acceleration/deceleration drive.
・ LSPD
: Pulse speed at the beginning of acceleration and end of deceleration
function
parameters
Pulse speed at maximum speed
・ HSPD
:
Acceleration time constant
・ CWATE
:
Deceleration time constant
・ DWATE
:
Set the parameters required for linear acceleration/deceleration EWD PCLSE drive.
Set EWD PCLSE
②
drive
Wumber of pulses for EWD PCLSE drive
・ EWD PCLSE
:
parameters
Pulse speed of EWD PCLSE drive
・ ESPD
:
DELAY TIME till EWD PCLSE drive starts after the end of
・ ESPD DELAY TIME
:
deceleration
③ Execute drive.
Execute drive
Do this operation when the initial value or the parameter value that
has been set needs to be changed.
SCAW drive and IWDEX drive
■
The following drive parameters need to be set for linear acceleration/deceleration SCAW/IWDEX drive:
・ LSPD
: Pulse speed at the beginning of acceleration and end of deceleration
・ HSPD
: Pulse speed at maximum speed
・ CWATE
: Acceleration time constant (acceleration curve parameter)
・ DWATE
: Deceleration time constant (deceleration curve parameter)
Linear acceleration/deceleration EWD PCLSE drive
■
Inserting EWD PCLSE immediately before the end of drive has the effect of suppressing vibration at ces
sation of the motor.
The EWD PCLSE drive includes the number of EWD PCLSEs in the positioning quantity and operates in cons
ideration of backlash.
The following drive parameters need to be set for the linear acceleration/deceleration EWD PCLSE drive.
・ EWD PCLSE
: Wumber of EWD PCLSE drive pulses
・ ESPD
: Pulse speed of EWD PCLSE drive
・ ESPD DELAY TIME
: DELAY TIME till EWD PCLSE drive starts after the end of deceleration
Commands that enable linear acceleration/deceleration EWD PCLSE drive
●
CCMMAWD
CCMMAWD
name
name
DWIVE CCMMAWD
DWIVE CCMMAWD
CCDE
CCDE
H'0022
+SCAW
*1
H'0110
ABS STWAIWHT CP
H'0023
-SCAW
*1
H'0112
ABS STWAIWHT CCWST CP
H'0024
IWC IWDEX
H'0150
IWC STWAIWHT CP
H'0025
ABS IWDEX
H'0152
IWC STWAIWHT CCWST CP
*2
2-axis circular
interpolation drive
*1 : This command is enabled when EWD PCLSE STCP MCDE of the SPEC IWITIALIZE3 command is 1.
<Applied function>
*2 : For 2-axis circular interpolation drive, this command is enabled when CIWCCLAW CP MCDE of the
CP SPEC SET command is 0 (correction drive at the end point is not executed).
<Applied function>