Reference Manual
BLR-CM/BLR-CM3phase
Rev. 08
2018-09
15
Independent of connection of the voltage measuring channel, nominal voltage is always the phase-phase
voltage!
2.5.3.4
CONNECTION MEASUREMENT
CONNECTION MEASUREMENT the setting if measuring of voltage is connected between two phases or between phase
and neutral phase. It is normally detected automatically at every start of BLR-CM. This is done by comparing the setting
NOMINAL VOLTAGE and the real measured voltage.
The selection can also be done manually by pushing the
◄►
button. The types, "U=L-N" or "U=L-L" are available.
2.5.3.5
SYNCHRONIZATION FREQUENCY
For a high precision of the measurement, the sampling rate has to be synchronized to the frequency of the grid. Caused
by commutation notches of mains voltage it is possible that the automatic synchronizing will not work reliable. This
creates failures in measurement. To avoid these problems, the following settings can be done:
Automatic synchronizing: For best measurement results, when mains voltage is without commutation notches.
FIX-50HZ: For a safe operation at 50Hz grid with bad mains quality.
FIX-60HZ: For a safe operation at 60Hz grid with bad mains quality.
2.5.3.6
PHASE COMPENSATION
The phase compensation enables the user to connect the current- and voltage measurement channels in any way. This
compensation angle complies with the phase angle between connected active current and voltage. The following table
shows the settings for some different connection types. This setting has to be made correct, because otherwise correct
regulation is not possible! If the current transformer is connected inverted, additionally a phase compensation of
180° has to be respected.
Voltage
L1-N
L2-N
L3-N
L1-N
L2-N
L3-N
L1-N
L2-N
L3-N
Current transformer L1
L2
L3
L2
L3
L1
L3
L1
L2
Connection
U=L-N U=L-N U=L-N U=L-N
U=L-N
U=L-N
U=L-N
U=L-N
U=L-N
Phase-Offset
0°
0°
0°
240°
240°
240°
120°
120°
120°
Voltage
L2-L3
L3-L1
L1-L2
L2-L3
L3-L1
L1-L2
L2-L3
L3-L1
L1-L2
Current transformer L1
L2
L3
L2
L3
L1
L3
L1
L2
Connection
U=L-L U=L-L U=L-L U=L-L
U=L-L
U=L-L
U=L-L
U=L-L
U=L-L
Phase-Offset
0°+90° 0°+90° 0°+90° 240°+90° 240°+90° 240°+90° 120°+90° 120°+90° 120°+90°
At BLR-CM3phase only the position of the voltage measurement can be compensated, because the regulator calcu-
lates the phase angle for the other phase from phase L1.
2.5.3.7
V-TOLERANZ MIN
The setting has to be done in percent related to the nominal voltage. If the measurement voltage falls below the ad-
justed limit, all active steps are switched off and the regulation stops.
!
