KEB COMBIVERT F5-A, Applications Manual, Page: 263 / 552

Current control, -limiting and switching frequencies
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.10 - 3
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7.10 Current control, -limiting and switching frequencies
7.10.1 Current control
The current controller (dS.00 „KP current“, dS.01 „KI current“) are automatically precharged by actuation of
Fr.10 by means of the equivalent circuit data.
The controller parameters are calculated from the equivalent circuit data.
The current decoupling must be activated in dS.02 for an optimal control characteristic. For the asynchronous
machine it is differentiated between "1: on" and "2: on, without main inductance“.
Mode 2 (without main inductance) must be used, if there are high DC link voltage fluctuations (e.g. at low mains
or spindle motors). The complete decoupling can lead to boosted current oscillation.
Otherwise mode „1: on“ for synchronous and asynchronous motor must be selected.
dS.02: current decoupling
Value Explanation
0: off Current decoupling off
1: on Current decoupling on
2: on, without main
inductance (ASM) partial current decoupling (mode only for asynchronous motors with unsmooth
DC link voltage)
3: only Usq (SM)
The decoupling of the S-mode can be activated separately.
4: only Usd (SM)
Exception: The controller parameters are only calculated according to the rating plate data at speed-controlled
operation of an asynchronous motor without motor model. These adjustments are default values for standard
motors and they are not suitable for special motors (e.g. high-and medium-frequency motors). A manual adap-
tion must be made here.
A current decoupling is also not possible in cases where the equivalent circuit data are unknown. Parameter
ds.02 must set to value 0.
dS.03: current/torque mode
Bit Meaning Value Explanation
4
Current controller/ priority
assignment (ASM)
0: off
16: on
Activation of the active current controller-priori-
ty in the regenerative range
Attention:
A change of bit 4 in parameter dS.03 is normally not necessary and should be done
only by authorized KEB service personnel.
The priority of the active current controller can be assigned in regenerative operation with bit 4 of parameter
dS.03 . In special applications this is advantageous for the quality of the current control