32
automatically determines the connection type of the voltage measurement.
This cannot be changed manually.
If the measured voltage is out of this tolerance, the connection type of
voltage measurement can be set manually.
206
Phase correction angle
0...345°
Depending on the connection of measuring voltage and current, a phase
shift can occur. The phase correction angle must be set to compensate this
phase shift,
because various calculations depend on the correct phase
angle. Otherwise, the control does not work correctly.
The phase correction angle can be identified automatically by executing the
automatic initialisation or it can be entered in
15° steps
.
If the AI correctly identified the phase correction angle for current and
voltage measurement, this value should not be changed.
In case the
automatic initialisation
failed due to unfavourable network
conditions, the phase correction angle must be entered manually. The table
Setting of phase correction angle depending on the connection in the Annex
offers an overview of the connection possibilities and the phase correction
angles to be set.
207
Start automatic initialisation
Yes/No
“YES”: Starts the “Automatic initialisation (AI)”.
Starts the “Automatic initialisation” after activating the AI (“YES”), the
setting is immediate
ly set back to “NO” then. The setting remains on
“YES” until the AI is started (U alarm, I-Low alarm).
The
automatic initialisation
switches all outputs one by one. In this way,
the controller can identify the used switching outputs. In addition to this, the
phase (connection of measuring voltage and current) is identified. In this
way, a potentially incorrect connection of the current resp. voltage input can
be identified and corrected by setting the phase correction angle.
The
automatic initialisation
only starts, if current and voltage are within
the set tolerances.
Outputs which are set to the stage type
“FON” or “Flty”, are not considered
during the
automatic initialisation
.
NOTE:
The automatic initialisation (AI) can only identify phases, if
capacitors are connected to the switching outputs. If the CX plus
compensates the reactive power by means of reactors, this function will
cause errors. AI works best when there are constant load conditions.
208
Synchronisation frequency
Auto/Fix50/Fix60
For highest accuracy of the measurement of voltage and current, it is
necessary to synchronise the sample values to the mains frequency. An
automatic synchronisation may be disturbed due to strong commutation
notches of the mains voltage despite internal filtering. This leads to huge,
striking measurement errors.
Therefore, the following settings are possible:
AUTO:
Automatic synchronisation for highest measurement accuracy at
mains voltage without commutation notches.
50
:
FIX-50 Hz
for a safe operation in 50 Hz mains with extremely poor mains
quality.
60: FIX-60 Hz
for a safe operation in 60 Hz mains with extremely poor mains
quality.
209
Temperature offset
-
10…10 °C
A temperature offset for the temperature measurement can be set here, in
order to correct possible component-dependent deviations.
