
B-65150E/04 4. SERVO FUNCTION DETAILS
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(iv) Torque command when the improved type overshoot
compensation is used
Function bit
OVSC = 1 (Overshoot compensation is valid)
Parameter
PK3V: around 32000 (Incomplete integral coefficient)
OSCTP: around 20 (Number of incomplete integral)
When overshooting with this parameter, try increasing the value
of the overshoot protection counter (OSCTP) by 10. Conversely,
when there is no overshooting, but unsteadiness occurs easily
during machine stop, decrease the overshoot protection counter
(OSCTP) value by 10.
When overshoot protection counter (OSCTP) = 0 it is the same as
existing overshoot compensation.
Fig. 4.7 (g) Torque command
(using improved type overshoot compensation)
If this function is used, the final torque command is TCMD3. If
the parameter PK3V (t3) is fixed so that this value becomes less
than the non–static friction level, overshoot is nullified. Because
torque command is maintained to some degree during machine
stop, it is possible to decrease unsteadiness during machine stop.
TCMD1
TCMD2
Torque command (TCMD)
Static friction
Time
Non-static friction
This time constant
is fixed at the
PK3V value.
t3
TCMD3