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DMM Technology Corp.
DYN4 AC Servo Drive Instruction Manual
REV. ZM7-A10A
CT1
7.5
Dynamic Target Position Update ( DTPU )
The DYN servo drive’s built in S-Curve generator is able to update the target position instantaneously regardless
of whether the current command position has completed or not. As soon as a new command position is received,
the servo drive immediately updates the servomotor target to the newest position. This function is applicable to
both relative (incremetal) and absolute positioning for all linear, or arc path profiles.
Without Dynamic Target Position Update DTPU technology, the servo drive must wait until the first, or current po
-
sition command is completed before executing the next one. This limits the rate at which the motor position can
be updated and and can also have detrimental effects on safety for the machine and the operator. With DTPU
technology, the servo drive is always under active command from the controller, allowing much faster cycle time
and higher universal efficiency.
The servo drive also applies a curved acceleration command to the S-Curve to maintain smoothest servo motor
motion. At each S-Curve “transition” point, the normally rigid path is curved into smooth speed transitions.
█
Efficiency
When the axis is command to a new position, the servo drive immediately updates the target position and gen-
erates new S-Curve profile to reach new target position.
Without DTPU technology, the axis must first finish its
current command before executing the next one, causing a delay in the overall positioning time.
This also allows more flexibility in programming and path planning as the controller no longer needs to wait until
a particular movement is finished before calculating the succeeding one. Robotic movements can be controlled
and commanded in real-time, significantly simplifying kinematic motion planning requirements on the controller.
Machine-level trajectory planning can almost be eliminated.
Without DTPU
With DTPU
Speed
Time
t
1
t
2
t
3
t
1
: Second command position given
t
2
: First position reached,
second position executed
t
3
: Second position reached
Speed
Time
t
1
t
2
t
1
: Second command position
given, servo drive immediately
targets to second position
t
2
: Second position reached
Time Reduced
DYN232M
DYN232M
D Y N A C S E RV O S Y S T E M - R S 2 3 2 M O T I O N
TM
TM
DTPU
P O S I T I O N I N G
