Acceleration/Deceleration Features Adjustment; Troubleshooting For Motor Drive - Adtech ADT-CNC4220 User Manual

electronic gear ratio is 200*32/4*1000=7/5; and CMR=7, CMD=5.
If the numerator of the electronic gear ratio is larger than the denominator, the top speed that the system allows will
drop.
If the numerator of the electronic gear ratio isn't equal to the denominator, the positioning accuracy of the system
will drop.
To ensure the positioning accuracy and speed index of the system, if the digital servo with electronic gear ratio
function is equipped, please set the electronic gear ratio to 1:1 and set the calculated electronic gear ratio into the
digital servo.
If step drive is equipped, please use the drives that have step subdivision function, select reasonable mechanical
transmission ratio, and set the electronic gear ratio of the system to 1:1 to avoid significant difference between the
numerator and denom
13.1.3 ACCELERATION/DECELERATION FEATURES
ADJUSTMENT
Adjust the system
parameters according to the features of the drive and motor, as well as the load of the machine
tool:
System parameters 10, 11: quick moving speed of axis X and axis Z;
System parameters 14, 15: linear acceleration/deceleration time constant when axis X and axis Z are moving in high
speed;
System parameter 7: acceleration/deceleration time constant of cutting feeding and manual feeding;
System parameter 6: Start/stop speed of acceleration/deceleration of cutting feeding;
The larger the acceleration/deceleration time constant is, the slower the acceleration/deceleration is, the lower the
impact of machine tool movement is and the lower the processing efficiency is; the smaller the
acceleration/deceleration time constant is, the faster the acceleration/deceleration is, the higher the impact of
machine tool movement is and the higher the processing efficiency is.
If the time constants of acceleration and deceleration are same, the higher the start/stop speed of the
acceleration/deceleration is, the faster the acceleration/deceleration is, the higher the impact of machine tool
movement is and the higher the processing efficiency is; the lower the start/stop speed of the
acceleration/deceleration is, the slower the acceleration/deceleration is, the lower the impact of machine tool
movement is and the lower the processing efficiency is.
The principle of acceleration/deceleration features adjustment is to reduce the acceleration/deceleration time constant
and increase the start/stop speed of the acceleration/deceleration properly to improve the processing efficiency on the
premise that the drive doesn't alarm, the motor doesn't desynchronize and the machine tool movement doesn't have
obvious impact. If the time constant of the acceleration/deceleration is too low, or the start/stop speed of the
acceleration/deceleration is too high, it is easy to cause drive alarm, motor desynchronization or machine tool
vibration.
When the matched step motor drives the device, if the quick moving speed is too high, acceleration/ deceleration
time constant is too low, and the start/stop speed of acceleration/deceleration is too high, the motor may be
desynchronized.
If AC servo drive devices are equipped, please set the start/stop speed to a high value and set the acceleration/
deceleration time constant to a low value to improve the processing efficiency. To get the perfect acceleration/
deceleration features, please set the acceleration/ deceleration time constant to 0 and adjust the acceleration/
ion parameters of the AC servo.
decelerat
Acceleration/deceleration control
System parameter 10: quick moving speed of axis X (unit: mm/min)
System parameter 11: quick moving speed of axis Z (unit: mm/min)
System parameter 14, 15: linear acceleration/ deceleration time constant when axis X and axis Z are moving in high
speed
System parameter 9: top cutting feeding speed of axis X and axis Z (unit: mm/min)
System parameter 7: feeding acceleration time constant; if this value is 0, no acceleration is performed (unit: ms)
System parameter 6: start speed of acceleration and stop speed of deceleration during cutting feeding (unit:
m/min)
m

13.1.4 TROUBLESHOOTING FOR MOTOR DRIVE

I. The motor doesn't work, or stops soon, and accompanied with hum.
Analysis: The reasons may be:
A. The power supply or wiring of the motor has problem, for example, the pulse cable isn't connected properly. The
drive enabling signal isn't connected properly.
B. The drive parameter setting has problem, such as the control mode (in position control mode), motor enabling
inator of the electronic gear ratio.
CNC 4 2 2 0 M a c hi ne Too l Op e ra t ion an d Te st
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