Operating mode
Vector control
10
Function library
10.3
10.3.2
L
10.3-10
EDS82EV903-1.0-11/2002
In general, the vector control is ready for operation after the motor parameters
have been identified. Vectorcontrol must only be optimised forthe following drive
performance: 43
Drive performance Remedy
Rough motor run and motor current (C0054) > 60 %
rated motor current in idle running (stationary operation)
1. Reduction of motor inductance (C0092) by 10 %
2. Check of motor current under C0054
3. If the motor current (C0054) > 50 % of the rated
motor current:
– C0092 must be reduced until the mot or current
amounts to 50 % of the rated motor current
– Reduce C0092 by max. 20 %!
– Note: If you reduce C0092 the t o rque will decrease!
Torque too low for frequencies f < 5 Hz (starting torque) Increase of motor resistance (C0084) or increase of
motor inductance (C0092)
Poor constant speed at high loads (setpoint and motor
speed are not proportional).
Increase o f slip compensa t i on (C0021)
Overcompensation results in drive instability!
Error messages OC1, OC3, OC4 or OC5 during
acceleration times (C0012) < 1 s (drive controller is no
longer able to follow the dynamic processes)
Change readjustment time of the I
max
controller (C0078):
• Reduction o f C0078 = I
max
controller becomes quicker
(more dynamic)
• Increase of C0078 = I
max
controller becomes slower
(”smoother”)
Optimising the vector control
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