Lenze E84AVHC Series - 5.4.2.3 Optimising the Imax controller

8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
V/f characteristic control (VFCplus)
120 L Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010
5.4.2.3 Optimising the Imax controller
Using the Lenze setting of the current limitation controller, the drive is stable:
Most applications do not require optimisation.
The setting of the current limitation controller must be adapted if
 power control including great moments of inertia is performed.
– Recommendation: Increase of the reset time Ti (C00074/1
) of the I
max
controller.
 vibrations occur in the V/f control (VFCplus + encoder) operating mode during the
intervention of the current limitation controller.
– Recommendation: Increase of the reset time Ti (C00074/1
) of the I
max
controller.
 overcurrent errors (e.g. OC3) occur due to load impulses or too high acceleration ramps.
– Recommendation: Reduction of the gain Vp (C00073/1
) and reset time Ti (C00074/
1) of the I
max
controller.
 Note!
V
min
boost is automatically calculated by the motor parameter identification
using the data specified on the motor nameplate so that a no-load current of
approx. 0.8 I
rated motor
results at the slip frequency of the machine.
V/f control (VFCplus + encoder)
If V/f control (VFCplus + encoder) is selected, we recommend a decidedly lower
V
min
boost:
• In this case, select a V
min
boost which ensures that approx. 50 % of the rated
motor current flows at slip frequency when the motor is idling.
Parameter Info Lenze setting
Value Unit
C00073/1 VFC: Vp Imax controller 0.25
C00074/1
VFC: Ti Imax controller 65 ms
efesotomasyon.com - Lenze