CG Drives & Automation, 01-7318-01r1 FDUL/VFXR/FDUG/VFXG/AFR/AFG Main features 39
7.16.1 Supply voltage measurement
board (hardware) - ver.1
For AFR/FDUL/VFXR applications, the grid voltage can be
measured using ver.1 of SVMB. Figure x shows how to
connect SVMB ver.1. Grid phase voltages should be
connected on high voltage side L1, L2 and L3. X and y
component of grid voltage generated from SVMB ver.1
should be connected to analogue inputs on the AFE control
board as shown in figure x. SVMB ver.1 takes +24V supply
from the AFE control board as shown in figure x. It should
be noted that the SVMB ver.1 draws 50 mA (out of 100
mA) from the AFE control board.
Fig. 31 Grid measurement circuit by means of SVMB ver.1
7.16.2 Supply voltage measurement
board (hardware) - ver.2
The grid voltage is measured by means of the AFE option
"Supply Voltage Measurement Board version 2' (SVMB
ver.2). The SVMB ver.2 is a mandatory AFE option
requirement in order to fulfill the basic grid codes, i.e. grid
voltage and frequency protection functions. The SVMB
ver.2 should be connected to the grid phase voltages on the
high voltage (HV) side and provides for galvanically isolated
conversion to the low-voltage (LV) side which should in
turn be connected to (and fed from) the user I/O on the
AFE control board (CB), see Fig. 32.
Fig. 32 Grid measurement circuit by means of SVMB ver.2 for AFE
It should be noted that the connection of the grid neutral to
the N-input is optional BUT required if true phase-to-
neutral voltages are to be monitored.
SVMB ver.1
AFR/FDUL/VFXR
L1
L1
X1.4
X1.5
X1.7
X1.7
X1.11
U
x
y
U
OV
GND
+24V
L2
L2
L3
L3
AFE
Supply
Control Board
Voltage
Measurement
Board
(Version 1)
SVMB ver.2
AFE.CB
L1
L1
U1
X1.3
X1.4
X1.5
X1.7
X1.7
X1.11
U2
U3
OV
COM
+24V
L2
L3
N
L2
L3
N
(optional)
High Voltage (HV)
AFE
Supply
Control Board
Low Voltage (LV)
Voltage
Measurement
Board
(Version 2)
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