Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 55)

Commissioning
Vector control
5−14
L
EDB82MV752 EN 5.2
5.5.3 Vector control optimisation
In general, the vector control is ready for operation without any further measures after the motor
parameters have been identified. The vector control must only be optimised in case of the following
drive behaviour:
7
Drive behaviour Remedy
Rough motor run and motor current (C0054) > 60 % rated motor
current in idle running (steady−state operation) 1. Reduce motor inductance (C0092) by 10 %
2. Check motor current in C0054
3. If the motor current (C0054) is > 50 % of the rated motor current:
– Reduce C0092 until the motor current amounts to approx. 50 %
of the rated motor current
– Reduce C0092 by max. 20 %!
– Note: If you reduce C0092, the torque will decrease!
Torque too low for frequencies f < 5 Hz (starting torque) Increase motor resistance (C0084) or motor inductance (C0092)
Poor speed stability at high load (setpoint and motor speed are
proportional anymore) Increase slip compensation (C0021)
Overcompensation results in drive instability!
Error messages OC1, OC3, OC4 or OC5 at acceleration times
(C0012) < 1 s (controller is no longer able to follow the dynamic
processes) Change reset time of the I
max
controller (C0078):
·
Reduce C0078 = I
max
controller becomes faster (more dynamic)
·
Increase C0078 = I
max
controller becomes slower ("smoother")