Sensorless Vector Control
motor is operated at mid-speed
(above 30Hz).
Speed variation occurs during an
operation at rated motor speed,
or during an overloaded high
speed operation.
CON-38 PM Flux FF %
CON-50 V Con HR
CON-51 V Con Ki
If the motor is operated at the rated speed, try
decreasing the value at CON-50 in 5%
increments.
If the motor response is slow, try increasing the
value at CON-51 in 5% increments (or, try
increasing the value at CON-38 in 100%
increments).
“OC1” fault or jerking occurs
during a high speed operation.
CON-43 PM SpdEst Kp
2
CON-44 PM SpdEst Ki 2
Try increasing the value at CON-43 in
increments of 10 and the value at CON-4 in
increments of 1.
Note that a fault may occur if the values at
CON-43 and CON-44 are set too high.
Jerking occurs during a low
speed operation.
Try increasing the value at CON-35 (low speed
range speed controller I gain) to eliminate
jerking.
A “clanking” noise is heard at the
beginning of startup or during
deceleration.
CON-34 ASR P Gain 1
CON-35 ASR I Gain 1
CON-47 PMdeadVolt
Per
Try increasing the values at CON-34 and CON-
35 in 10% increments, or try decreasing the
value at CON-47 in 10% decrements.
The motor cannot reach the
speed reference when it is
operated at or above the rated
speed, or when the acceleration
is not responsive.
CON-50 V Con HR
CON-51 V Con Ki
Try increasing the value at CON-50 in 1%
increments if the motor cannot reach the speed
reference.
Try increasing the value at CON-51 in 10%
increments if the motor acceleration is not
responsive.
“OC1” trip occurs after an abrupt
regenerative load (over 100%).
CON-34 ASR P Gain 1
CON-35 ASR I Gain 1
Try decreasing the values at CON-34 and
CON-35 in 10% decrements.
The motor jerks during
acceleration.
Try increasing the speed estimator proportional
gain 0 at CON-40 in increments of 5.
A massive current rises when the
motor is stopped during a 20:1
speed startup.
Try increasing the value at CON-35 in 10%
increments.
An oscillation occurs when an
abrupt load is applied to the
motor during a low speed
operation.
CON-39 PM SpdEst Kp
0
CON-40 PM SpdEst Ki 0
Try increasing the values at CON-39 and CON-
40 in 10% increments.
During a PM speed search, the
speed search stops at around
20% of the base frequency, and
the motor is stopped and starts
again after a massive current
rises.
Try decreasing the value at CON-69 in 5%
decrements.
During a high-speed operation in
PM control mode utilizing the
kinetic energy buffering, a
massive current rises at around
20% of the base frequency, the
motor is stopped, and it fails to
start.
CON-78 KEB Start Lev
CON-79 KEB Stop Lev
CON-81 KEB P Gain
CON-82 KEB I Gain
Try increasing the values at CON-78 and CON-
79 in 5% increments, or try doubling the gain
values at CON-81 and CON-82.
1. When the motor is overloaded,
the maximum torque limit current
is supplied to the motor at
startup, and the motor fails to
MOT-17 Lq (PM)
MOT-20 Lq (PM Scale
This happens when the Lq parameter value is
decreasing due to certain causes, such as self-
saturation.
To Next Page
Loading...
