The $64000 question,
which alarm do I troubleshoot?
Which alarm to pick
from the several alarms displayed on the screen:
There is always a
good chance, that there is going to be more than
one alarm. It has to be decided which alarm is
causing the other. One might see an estop alarm most
of the time. All it means is some unacceptable
condition has brought the machine to an estop
condition. Actual cause may be something else. The
following are the major types of alarms. Some
controls may list these alarms as PLC and NC alarms
to make it easier. First and foremost, go through
all alarms and categorize them according to the
following:
1) PLC
alarm - These are mostly related to input. Examples
are
proximity switch not sensed or Tool
changer not in position. These input conditions
may stop the machine from moving. In other
words all the things have to be at its specific
place. These types of alarms are generated by PLC.
2) Axis
alarms (Drive Alarm) - When an axis malfunctions, it
will stop the spindle and may go to estop mode.
There might be an axis, spindle and estop alarm.
Most of the drives, if there is a provision for red
light or led display on the drive, it would latch
that alarm. But if the axis came to a stop due to
external cause then the drive may not have an alarm
indication.
3) Spindle
alarm (Drive Alarm) - when this happens it will stop
the spindle, and put an alarm out. Most of the
drives, if there is a provision for red light or led
display on the drive, it would latch that alarm. But
if the spindle came to a stop due to external cause
then the drive may not have an alarm indication.
4) Control
alarm - This alarm comes up together with the above
alarms. It might first give an estop alarm then put
out a spindle or servo alarm. Sometimes control
itself may have some red lights indicating the board
in the control is bad.
The success of
trouble shooting will depend on choosing the right
alarm to troubleshoot or right major module which
caused the problem.
Once it is
categorized, figure out which takes precedence. When you see
several alarms in the screen,
a) The
control alarm normally takes precedence.
b) If
the drive has any error leds ON, then Drive alarm
takes precedence.
c) Some
time you may have PLC alarms putting out axis
alarms. If there are no lights indicating that alarm
on the drive, then PLC alarm takes precedence over all alarms.
25% of the work is done by choosing the right alarm.Author: Ven Swaminathan.
Email - Ven@cnconestop.com
For more information visit
www.cnconestop.com/CNC.htm
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