Hard Limit Function; Enabling Hard Limit Function - Adtech ADT-CNC4220 User Manual

mode, etc.
C. The motor stops soon and hums. The machine tool controller is still working normally, the coordinates still change
according to the program instructions, this is because that the step motor and its load have inertia, and thus the motor
can't start and stop immediately during working, loses steps when it is started and exceeds steps when it is stopped.
To solve the problem: through an acceleration and deceleration process, start with low speed, accelerate to a certain
speed and then decelerate until stopped. The reasonable and smooth acceleration/deceleration control is the key to
ensure the reliable, efficient and accurate running of the step driving system.
First, check whether the power supply of the drive is normal, and then check whether all the cables of the drive are
connected. Refer to the drive instructions to check whether it is necessary to connect enabling signal. If yes, please
follow the instructions (the drive interface of the system doesn't have dedicated enabling port, but 24V and 5V DC
voltages are available). Then, check whether the working mode of the drive is position control mode and direction
+ pulse mode. Please select internal power enabling mode if servo is used. If the motor desynchronizes, please
modify the start speed, quick moving, feeding speed, maximum feeding speed and acceleration time of axis X and
axis Z.
II. The motor only runs in one direction
Analysis: This is because the direction signal can't be changed. Please check whether the direction signal DR is
connected normally.
Method: Measure the DR+ and DR- voltage signals with a voltmeter and then press the positive/negative movement
key of the axis, and the polarity of the voltage shall change. If the polarity doesn't change, the system has fault.
Please contact the system manufacturer. If the polarity changes, the drive has fault.
III. Drive alarm
Please refer to the drive instructions to check the alarm reason, eliminate the fault and clear the alarm (the system
drive has a drive alarm reset signal and you can press the Reset key to clear)

13.2. Hard limit function

The hard limit function consists of two hard limit travel switches, which are positive limit and negative limit.
Digital input wiring board

13.2.1 ENABLING HARD LIMIT FUNCTION

The hard limit function is controlled by system parameters. Set the system parameter 22 hard limit enabling to "1" to
enable the hard limit function, or set to "0" to disable the function. The system parameter 23 is hard limit effective
level. Set the value (NO: 0, NC: 1) according to the actually connected switch type (NO, NC). After setting the hard
limit parameters, move to the limit switch of every axis in low speed manually and check whether the parameters are
set properly.
To move to the positive limit switch of axis X, when the positive limit switch is enabled, axis X stops moving
immediately and alarms, and won't move to the positive direction. To solve the problem, move to reverse direction to
leave the limit switch, and press the Reset key to clear the alarm.
CNC 4 2 2 0 M a c hi ne Too l Op e ra t ion an d Te st
XS5 interface
Alarm info
Axis X positive direction overtravel
Alarm
Alarm info display
Axis Z positive limit travel switch
xis Z negative limit travel switch
Axis X positive limit travel switch
xis X negative limit travel switch
MDI mode
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