
B–63505EN/02
7.TROUBLESHOOTING
235
When a failure occurs, it is important to correctly grasp what kind of
failure occured and take appropriate action, to promptly recover the
machine.
Check for the failure according to the following procedure :
Recovery
With what
operation?
What failure?
Appropriate action
When?
Grasp the kind of failure
↓
↓
(1) When and how many times (frequency of occurrences)
(2) With what operation
(3) What failure occurred
1 When did the failure occur?
D Date and time?
D Occurred during operation? (how long was the operation?)
D Occurred when the power was turned on?
D Was there any lightening surge, power failure, or other disturbances
to the power supply?
How many times has it occurred
D Only once?
D Occurred many times ? (How many times per hour, per day, or per
month?)
2 With what operation did it occur ?
D What was the NC mode when the failure occurred?
D Jog mode/memory operation mode /MDI mode /reference position
return mode
If during program operation,
1) Where in the program ?
2) Which program No. and sequence No. ?
3) What program ?
4) Occurred during axial movement ?
5) Occurred during the execution of an M/S/T code ?
6) Failure specific to the program ?
D Does the same operation cause the same failure ?
(Check the repeatability of the failure.)
D Occurred during data input/output ?
<Feed axes and spindles>
D For a failure related to feed axis servo
1) Occurred at both low feedrate and high feedrate ?
2) Ocurred only for a certain axis ?
D For a failure related to spindles
When did the failure occur ? (during power–on, acceleration,
deceleration, or constant rotation)
7.1
CORRECTIVE
ACTION FOR
FAILURES
7.1.1
Investigating the
Conditions Under
which Failure Occurred