Learning Advanced Features
around 20% of the base
frequency, and the motor is
stopped and starts again after
a massive current rises.
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.
Cn.79 KEB Stop Lev
Cn.80 KEB P Gain
Cn.81 KEB I Gain
Try increasing the values at Cn.78 and
Cn.79 in 5% increments, or try doubling
the gain values at Cn.80 and Cn. 81.
1. When the motor is
overloaded, the maximum
torque limit current is supplied
to the motor at startup, and
the motor fails to operate due
to an inverter overload fault
trip.
2. Speed search fails when
the a load exceeding the
rated load is applied to the
motor at each speed section,
or a current equal to or
exceeding 150% of the rated
current is supplied to the
motor.
This happens when the Lq parameter
value is decreasing due to certain causes,
such as self-saturation.
Try increasing the value (100%) at bA.32
in 5% increments.
A fault trip occurs when the
motor tries to start up or
accelerate from a free run at
certain speed range.
During a PM synchronous motor
operation in sensorless vector mode, the
motor starts up after the initial pole
position detection is made.
To accelerate the motor in a free-run
state, enable speed search at
acceleration by setting bit 0 (0001) at
Cn.71 (Speed Search).
During a low speed
operation, the output speed
search becomes unstable
when a massive load
exceeding the rated load is
abruptly applied to the motor.
The motor control may become unstable
due to input voltage deviation during a
low-speed operation with low voltage
input.
Try decreasing the values at Cn.31 and
Cn.40 in 10% decrements.
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