Drive Monitor Screen (Synchronous Error) - Mitsubishi Electric M80 Series Maintenance Manual

M800/M80/E80 Series Maintenance Manual
4 Failure Diagnosis

4.7.4 Drive Monitor Screen (Synchronous Error)

Diagn
The "Synchronous error" appears only when the synchronous control axis specification is valid.
The various data related to the synchronous error can be monitored by selecting the menus [Drv mon] -> [Synchro error]
on the diagnosis (Diagn) screen.
Display items
Display items
Slave axis
Command error
FB error
FB error MAX1
FB error MAX2
Machine position
IB-1501273-F
This displays the slave axis name which is controlled following the master axis.
The axis name corresponding to the axis No. set in the axis specification parameter
"#1068 slavno" (slave axis No.) is displayed.
The name set in the base axis specification parameter "#1022 axname2" (2nd axis
name) is displayed for the slave axis.
This is the deviation of the slave axis machine position in respect to the master axis.
The error of the commanded position to the servo control section before pitch error
compensation, relative position compensation and backlash compensation is dis-
played.
If this error occurs, the parameters that should be the same for the synchronous axes
are different.
Command error = Command s - command m -Δ
Command s: Slave axis commanded position
Command m: Master axis commanded position
Δ: Command s - command m at start of synchronous control
This is the deviation of the slave axis feedback position in respect to the feedback po-
sition from the master axis servomotor. The actual error of the machine position is dis-
played. The synchronous error check is carried out on this error.
FB error = FBs - FBm - Δ
FBs: Slave axis feedback position
FBm: Master axis feedback position
Δ: FBs - FBm at start of synchronous control
This displays the maximum FB error after the start of the synchronous control.
This displays the maximum FB error approx. every 30 seconds after the start of the
synchronous control.
This displays the commanded machine position for the master axis.
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Details