B–62075E/04
5. TROUBLESHOOTING
322
Spindle speed changes abnormally due to load.
Confirm the following
parameter :
Check whether spindle speed is constant by view
of the speed meter on CRT.
Constant ?
Heavy cutting?
Is a heavy cutting being per-
formed ? Confirm spindle load
on CRT.
Reduce cutting condition
PRM 5701
PRM 5702
PRM 5721
PRM 5722
Doesn’t the cutting tool worn ?
Worn ?
Spindle servo unit is faulty
Spindle motor is faulty
Replace tool
YES
NO
YES
NO
YES
NO
PRM 5701 : A ratio of spindle speed at which actual spindle speed is
regarded as arrived at a command spindle speed.
PRM 5702 : Spindle speed fluctuation ratio up to which the spindle
speed fluctuation detection alarm is not issued.
PRM 5721 : Spindle speed fluctuation that is not regarded as the spindle
speed fluctuation alarm.
PRM 5722 : Time when a spindle speed changed to when spindle speed
fluctuation detection is started.
5.20
ALARM OT117
(SPINDLE SPEED
FLUCTUATION
DETECTION ALARM)
Remedies
Remedies