Functions
8.24 Open-loop and closed-loop control
Control Units CU240S
8-168 Operating Instructions, 11/2006, A5E00766042B AA
Note
Contrary to closed-loop vector control, for the V/f open-loop control mode with FCC, it
is not possible to specifically influence the motor torque. This is the reason that it isn’t
always possible to avoid the motor stalling – even when using "V/f with FCC".
An improvement in the stabilizing behavior and in the motor efficiency can be
expected when using the closed-loop vector control when compared to V/f control with
FCC.
8.24.1.5 Current limiting (Imax controller)
Data
P1340 … P1346 Parameter range:
r0056 bit 13
Warnings: A0501
Faults: F0001
Function chart number: FP6100
Description
In the V/f characteristic mode, the inverter has a current limiting controller in order to avoid
overload conditions (Imax controller, see figure below). This controller protects the inverter
and the motor against continuous overload by automatically reducing the inverter output
frequency by f
Imax
(r1343) or the inverter output voltage by V
Imax
(r1344). By either reducing
the frequency or voltage, the stressing on the inverter is reduced and it is protected against
continuous overload and damage.
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