Lenze E82MVxxx_4Bxxx - Manual (Page 105)

Commissioning
Vector control
6
l
105 EDK82MV752 DE/EN/FR 7.1
Optimising the vector control
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 the
case of the following drive behaviour:
Drive behaviour Remedy
Rough motor run and motor current (C0054) > 60 %
rated motor current in idle running (steady−state
operation) 1. Reduce motor stator 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 is
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 no longer proportional) 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):
l Reduce C0078 = I
max
controller becomes faster
(more dynamic)
l Increase C0078 = I
max
controller becomes slower
("smoother")