
B-63943EN-1/02 2.PREPARATIONS FOR OPERATION
- 379 -
<1> When an unexpected disturbance torque is detected, servo motors
are stopped immediately. Axes with the same group number set
in parameter No. 1881 and axes with 0 set in the parameter are
all stopped immediately then placed in the interlock state. At
this time, axis movements are stopped regardless of commands of
the CNC, so there is a difference between the coordinates held by
the CNC and the actual motor position. This difference is
accumulated as a servo error amount.
<2> When the operation is restarted, a follow-up operation is
performed by inputting the servo off signal to match the
coordinates held by the CNC and the actual motor position.
Input the servo off signals for all axes of the same group (the
axes with the same group number set and axes with group
number 0 set). When servo off signals are input, the follow up
signal *FLWU (G007#5) must be set to 0, and bit 0 (FUPx) of
parameter No. 1819 must be set to 0.
<3> After servo off signal input, in-position signal INPx is turned on
when the error amount enters the effective area.
<4> Check that the in-position signals for all axes that belong to the
same group have been turned on, then input a reset (ERS or a
reset key).
CAUTION
When an unexpected disturbance torque is
detected using the unexpected disturbance torque
detection group function, be sure to follow the
timing chart shown above to input servo off signals
then perform a reset operation. If a reset is made
without inputting the servo off signals, a shock may
apply to the machine.
NOTE
1 The servo off signal must be input with follow up
signal *FLWU (G007#5) set to 0 and bit 0 (FUPx)
of parameter No. 1819 set to 0.
2 Input the servo off signals for all axes of the group
to which the axis with an unexpected disturbance
torque detected belongs. Also for axes for which
0 is set in parameter No. 1881, input the
corresponding servo off signals.
3 When an unexpected disturbance torque is
detected for a PMC axis or when an axis for which
an unexpected disturbance torque is detected
belongs to a group that includes a PMC axis, all
axes of the cluster to which that PMC axis belongs
are placed in the interlock state.