Filter
Top Products
5. Spindle Adjustment
5 - 51
(2) Adjusting the acceleration/deceleration time constant
Synchronous tap synchronizes the operation with the servo. Generally, the spindle takes longer to
accelerate and decelerate, so the acceleration/deceleration time constant is determined on the
spindle side. Measure the acceleration time for the S command, and set a value 1.5-fold that as
the standard value.
If the spindle maximum rotation speed is 2000r/min during synchronous tap operation, first carry
out 2000r/min acceleration/deceleration with the S command as shown below. Then, measure the
total acceleration/deceleration time in a linear, 2-step or 3-step state. The time constant for
synchronous tap operation is 450ms which is 1.5-fold 300ms.
Measuring the acceleration time during S command
POINT
When carrying out synchronous tap operation with a motor capable of coil
changeover, either the high-speed coil or low-speed coil is used. Fix the coil
being used, and measure the acceleration time by issuing the S command in
this case.
(3) Synchronous tap trial operation
Carry out trial operation after setting the parameters. Carry out dry operation without tapping or a
workpiece, and confirm the amount that the spindle moves in respect to the servo axis. If an alarm
occurs when there is no load, check the cause with the following table.
Troubleshooting for synchronous tap trial operation
Fault Cause Remedy
Excessive error
alarm occurs
(ALM52)
The synchronous tap detector direction is
set in reverse.
Check the SP193/bit5 setting.
0 = Forward run, 1 = Reverse run
The motor cannot follow because the tap
time constant is too short.
Readjust the tap time constant.
Set a value double the value for the S command.
Overcurrent alarm
occurs (ALM32)
The motor cannot follow because the tap
time constant is too short.
Readjust the tap time constant.
Set a value double the value for the S command.
The speed loop gain is too high for
synchronous tap control (Is there vibration
when changing to synchronous control?)
The SP194 setting value is too large.
Set 100% as the standard.
The current loop gain is too high during
synchronous tap control.
The SP219, SP220 setting value is too large.
Set 100% as the standard.
The closed loop and semi-closed loop
settings for spindle control are incorrect.
Check which detector's FB is being used.
Spindle ENC = full closed loop: SP193/bit0 =0
Motor PLG = semi-closed loop: SP193/bit0 =1
The spindle rotation
movement amount
does not match the
command
The gear ratio setting is incorrect. Check the machine gear ratio.
Number of gear teeth on spindle side : SP025 to SP028
Number of gear teeth on motor side : SP029 to SP032
0
1000
2000
Acceleration time durin
g
S command
Standard acceleration time during synchronous tap (1.5-fold)
Speed FB
[r/min]
0 300 450 [ms]
During S
command
During synchronous tap control