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7. Diagnosis
7.2 SERVO MONITOR
I-278
7.2.6 Display Items for the Synchronous Error
The various data related to the synchronous error is monitored.
MESSAGE SERVO SPINDLE PLC-I/F MENU
[SYNCHRONOUS] ALARM/DIAGN 2. 6/6
X - Y
ERR COMAND 0.000
ERR FB –0.012
MACHINE X-12345.678
Z - W
ERR COMAND 0.000
ERR FB –0.012
MACHINE Z-12345.678
<For simple C axis synchronous control>
MESSAGE SERVO SPINDLE PLC-I/F MENU
[SYNCHRONOUS] ALARM/DIAGN 2. 6/6
C - C
ERR COMAND 0.000
ERR FB –0.012
MACHINE C-12345.678
ERR COMAND 0.000
ERR FB 0.000
MACHINE 0.000
Display item Explanation
ERR COMAND
This is the deviation of the slave axis in respect to the master axis. The
error of the command value to the servo control section is displayed.
For simple C axis synchronous control, this indicates the difference of the
command value to the C axis control section caused by deviation of the
slave axis in respect to the master axis.
If this error occurs, the parameters that should be the same for the
synchronous axes are different. Check the setting value.
The command difference is calculated with the following expression.
Command error = Command
S
− command
M
− ∆
Command
S
: Slave axis command value
Command
M
: Master axis command value
∆ : Command
S
when synchronous operation is selected –
command
M
ERR FB
This is the deviation of the slave axis feedback value in respect to the
feedback value from the master axis servomotor. The error of the actual
machine position is displayed.
For simple C axis synchronous control, this indicates the error in the
actual machine position caused by deviation of the slave axis feedback
value in respect to the feedback value from the master axis' C axis motor.
The synchronous error check is carried out on this error.
FB error = FB
S
− FB
M
− ∆
FB
S
: Slave axis feedback value
FB
M
: Master axis feedback value
∆ : FB
S
when synchronous operation is selected − FB
M
MACHINE This displays the machine position of the master axis.
(Note 1) If the operation method is changed due to changes in the R435/436 register, the error offset ∆ will
be created at the rising edge of the changes.
Note that if the zero point is not set, the error offset ∆ will be created after the zero point is set.