
11.TROUBLESHOOTING B-63945EN/02
- 566 -
(1) Occurred at both low feedrate and high feedrate ?
(2) Occurred only for a certain axis ?
- For a failure related to spindles
When did the failure occur ? (during power-on, acceleration,
deceleration, or constant rotation)
3 What failure occurred ?
- Which alarm was displayed on the alarm display screen?
(Check the axis along which an alarm has occurred for
alarms SV alarms, OT alarms, or SP alarms.)
- Is the screen correct ?
- If machining dimensions are incorrect
(1) How large is the error ?
(2) Is the position display on the CRT correct ?
(3) Are the offsets correct ?
4 Other information
- Is there noise origin around machine?
If the failure has not occurred frequently, the cause may be
external noise to the power supply or inductive noise on
machinery cables.
Operate other machines connected to the same power line
and see if noise come from the relays or compressors.
- Is it taken any countermeasure for noise in machine side?
- Check the following for the input power supply voltage :
(1) Is there variation in the voltage ?
(2) Are the voltages different depending on the phase ?
(3) Is the standard voltage supplied ?
- How high is the ambient temperature of the control unit?
Refer to manual about noise.
- Has excessive vibration been applied to the control unit?
5 When you contact our service center, specify the following
items :
(1) Name of the NC unit
(2) Name of the machine tool builder and type of machine
(3) Software series/version of the NC
(4) Specifications of the servo amplifier and motor
(for a failure related to the servo)
(5) Specifications of the spindle amplifier and spindle motor
(for a failure related to a spindle)
- See the drawing issued by the machine tool builder for
the locations of the NC unit and servo/spindle
amplifiers.
- We use the following specification codes :
Servo /spindle amplifier : A06B-xxxx-Hxxx
Servo/spindle amplifier : A06B-xxxx-Bxxx
NOTE
The mark ‘x’ represents a number.