KEB COMBIVERT F5-A, Applications Manual, Page: 233 / 552

Speed control
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.7 - 7
7
7.7.1.4 Operating state-dependent control parameters
The following parameters serve for the "fine tuning" of the speed controller and may not be changed in many
applications.
variable proportional factor KP KP factor
The proportional factor "KP speed" is adjusted
in (cS.06).
In addition to the standard KP-value a system-
deviation-dependent proportional gain can
be adjusted with cS.07 and cS.08. With it the
dynamic performance can be improved and
overshootings can be dampened.
cS. 08
cS.06
cS.07
Xd(n)
variable integral factor KI KI factor
Parameters cS.09...cS.12 determine the inte-
gral factor of the speed controller.
The KI-factor can be varied speed-dependent in
order to reach a better speed rigidity at small
speeds and in standstill.
- cS.09 forms the base value.
- the maximum value for the integral factor
is cS.09 + cS.10.
- the two corner speeds cS.11 and
cS.12 determine the speed range in which the
KI value is changed.
cS.09+
cS. 10
cS.09
cS.11 cS.12 act. speed
A special function can be activated in parameter max. speed for max. KI (CS.11) by setting -1: brake release
which works only in connection with the brake control.
An enormous speed rigidity is required for load transfer with hoist drives or lifts,
in order that the brake release and the load transfer are not significant by the inverter.
This controller adjustment is not to be used for normal operation, since the speed controller oscillates too much
at this adjustment.
The solution is to enter a high value in parameter "KI offset“ (cS.10) in order make the controller rigidy. If cS.11
indicates the value "- 1: brake release", this "KI offset" is set immediately to 0 at the end of the brake release
time, not reduced during operating in a speed range.