Technical documentation
Rev. 02
Reactive Factor Controller CX plus
70
13 Identification / manual entry of step sizes
13.1 Step identification is activated
– Automatic identification of the step size
If the step identification is activated (SETUP/308 =
YES
), the CX plus automatically determines the
step size after switching on and after switching off a step, respectively. This value is saved as the
current step size for this step in the step database after the first switching operation. Then, the current
step size is quickly adjusted to the determined value during the first 50 switching operations. The step
identification for a step is completed after 50 switching operations (switching on 25 times, switching off
25 times).
The original step size is now equated with the current step size in the step database. The monitoring
of the step power loss is active for this step from now on.
The step identification for a step may be concluded prematurely by manually entering the step size.
From the 51
st
switching operation on, the CX plus continuously adjusts the current step size to the
determined value when switching a step on and off. The adjustment takes place softly, so that a heavy
load fluctuation during the measurement does not falsify the step size. In this way, the power loss of a
step may be determined.
The updating and adjustment of the step size is even active when the step identification is switched
off.
If the controller cannot identify a mains reaction during the first 3 switching operations (switching on
and off =
1 switching operation), the step type of the affected step is set to “
FOFF
”.
If a step has more than three switching operations and if the controller cannot identify a mains reaction
during 3 consecutive switching operations, the step is considered as faulty by the control. If the
function “
Lock faulty steps
” is activated (SETUP/309 =
YES
), the affected step is set to the step type
“
Flty
” and is ignored by the control. It is not possible to switch this step manually. The step symbol of
the faulty step is flashing in the step display on the display.
If the current transformer or the voltage transformer factor is entered, all step sizes (current and
original step size) are reset to the initial value of 3 var capacitive. The step identification starts all over
again.
NOTE:
If inductive steps are connected, the step sizes must be entered manually, because the initial
value is 3 var capacitive and thus cannot be switched on in case of a capacitive network.
13.2 Problems regarding the step identification
The step identification can be falsified due to heavy and rapid load fluctuations. In this case, the
determined step sizes may extremely deviate from the actual nominal value. It is possible, that a
capacitive step is identified as an inductive step. The control will not work correctly in this case.
Solution:
In this case, the step sizes = step nominal value must be entered manually.
Procedure:
Switch off the control.
