Lenze 8200 motec Instructions De Montage page 116

7 Commissioning
Vector control
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
Rough motor run and motor current (C0054) > 60 %
rated motor current in idle running (steady−state
operation)
Torque too low for frequencies f < 5 Hz (starting
torque)
Poor speed stability at high load (setpoint and
motor speed are no longer proportional)
Error messages OC1, OC3, OC4 or OC5 at
acceleration times (C0012) < 1 s (controller is no
longer able to follow the dynamic processes)
116
Remedy
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!
Increase motor resistance (C0084) or motor
inductance (C0092)
Increase slip compensation (C0021)
Overcompensation results in drive instability!
Change reset time of the I
l Reduce C0078 = I
(more dynamic)
l Increase C0078 = I
slower ("smoother")
l
controller (C0078):
max
controller becomes faster
max
controller becomes
max
EDK82MV371 DE/EN/FR 7.0