Kitagawa NC Rotary Table Manual page 34

Symptom ⑤： Table is not clamped or unclamped
Possible causes
Faulty solenoid valve
Faulty clamp/unclamp confirming device
(pressure switch)
Damage or connection failure of working
fluid pipe for clamp
Supply pressure of working fluid for
clamp is lower than specified value
Back pressure acts to the air pressure
exhaust port of solenoid valve, as the air
purge port in the motor case is blocked.
Faulty clamp device
Fault due to damaged NC rotary table or
expired life of components
Symptom ⑥： Index accuracy error
Possible causes
The unit is overloaded during rotation
Workpiece is dislocated due to low
clamp torque
Zero return position is dislocated due to
faulty zero point shift adjustment
Faulty zero point
adjustment
Faulty zero return deceleration signal
device
Faulty clamp operation
Inappropriate backlash amount
Inappropriate backlash compensation
amount
Worm shaft locking failure in backlash
adjustment
Fault due to damaged NC rotary table or
expired life of components
30
dog position
Corrective actions
Replace the solenoid valve
Check and replace the clamp/unclamp
confirming device (pressure switch)
Check the piping for connection, and
replace
Change to appropriate value according to
the specification
Remove the cause that blocks the air
purge port.
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
Corrective actions
Compare NC rotary table specification with
work condition to make improvement
Compare NC rotary table specification with
cutting condition to make improvement
Check the zero point and zero point shift
amount
Adjust the zero point dog
Check the zero return deceleration signal
device and replace the proximity switch
See "Symptom ⑤"
Adjust the backlash
Change the backlash
amount
Readjust
Stop the use of NC rotary table
immediately.
Please contact the sales agent.
compensation