Learning Advanced Features
Problem
Troubleshooting
motor is stopped, and it fails to
start.
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.
bA.29 Lq (PM)
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.
Cn.71 Speed Search
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
Cn.13 ASR I Gain 1
Cn.40 PMdeadVolt
Per
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.
5.12 Kinetic Energy Buffering Operation
When the input power supply is disconnected, the inverter’s DC link voltage decreases, and a low
voltage trip occurs blocking the output. A kinetic energy buffering operation uses regenerative
energy generated by the motor during the blackout to maintain the DC link voltage. This extends
the time for a low voltage trip to occur, after an instantaneous power interruption.
Cn 77
Kinetic energy buffering
selection
KEB Select
0 None
0~2 -
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