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Moog Animatics SmartMotor™ Developer's Guide, Rev. L
Page 380 of 909
DEA
Derivative Error, Actual
APPLICATION:
Motion control
DESCRIPTION:
Read actual derivative error value
EXECUTION:
Updated once each PID sample
CONDITIONAL TO:
Servo active (MP, MV, etc., but not MT mode)
LIMITATIONS:
N/A
READ/REPORT:
RDEA
WRITE:
Read only
LANGUAGE ACCESS:
Formulas and conditional testing
UNITS:
Units of position error per PID cycle *65536
RANGE OF VALUES:
Output: -2147483648 to 2147483647
TYPICAL VALUES:
N/A
DEFAULT VALUE:
0
FIRMWARE VERSION:
5.x and later
COMBITRONIC:
RDEA:3, x=DEA:3
where ":3" is the motor address — use the actual address or a
variable
DETAILED DESCRIPTION:
The DEA command is used to read back the rate of change of the PID position error. This value
is averaged over four consecutive PID cycles and is in units of position error per PID cycle
*65536. This measured value is used in dE/dt limiting, which can be set through the DEL
command.
DEL (Derivative Error Limit) provides the safest and quickest method to fault a motor on
sudden changes in load or detection of human interference.
The purpose of this limit is to act as a look-ahead on following error. Instead of just triggering
on a raw following error based on how far behind the motor may be in a move, the processor
is looking at how fast that following error changes.
dE/dt refers to the dynamic rate of change of following error. This results in an instant release
of energy and less chance of damage to equipment or injury to machine operator. Under
normal servo control following error limits, if the load collides against an object, the motor
will not fault until the following error limit is reached. As a result, applied current and torque
will increase until that condition is met. By adding an additional derivative limit on following
error, the servo will fault within milliseconds of contact with an object.
Part 2: Commands: DEA
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