73
Test operation and gain adjustment of the PM sensorless vector control
4
PARAMETERS
5
Acceleration/deceleration time is
different from the setting.
(1) Torque shortage
(2) Load inertia is too high.
(1) Raise the stall prevention operation level. (
Refer to
page 74
)
(2) Set acceleration/deceleration time suitable for the
load.
6 Machine movement is unstable.
(1) Speed control gain is not
suitable for the machine.
(2) Response is slow because
of the drive unit's
acceleration/deceleration
time setting.
(1) Adjust Pr. 820 and Pr. 821 (
Refer to page 71)
(2) Set the optimum acceleration/deceleration time.
7
Rotation ripple occurs during the
low-speed operation.
Speed control gain is too low. Raise Pr. 820.
Condition Possible cause Countermeasure
