Learning Advanced Features
increments/decrements of 5% (set below
100%).
The motor hunts when
the load increases from
the base frequency or
higher.
Increase the value of Cn.22 by increments of
50m/s or decrease the value of Cn.24 by
decrements of 5%.
The motor hunts as the
load increases.
At low speed (10Hz or lower), increase the
value of Cn.29 by increments of 5.
At mid speed (30 Hz or higher), increase the
value of Cn.28 by increments of 500. If the
parameter setting is too extreme, over
current trip may occur at low speed.
The motor speed level
decreases.
Select 6. Tr (static type) from bA. 24 and run
bA.24 Rotor time constant tuning.
*Hunting: Symptom of irregular vibration of the equipment.
5.11 Sensorless Vector Control for PM (Permanent-
Magnet) Synchronous Motors
Sensorless vector control is an operation that carries out vector control without rotation
speed feedback from the motor but, instead, with an estimation of the motor rotation speed
calculated by the inverter.
Depends on the
motor capacity
Depends on the
PM motor capacity
Depends on the
PM motor capacity
Depends on the
motor capacity
Depends on the
motor capacity
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