Actual Value Sensing - Siemens SIMOVERT MV Series Commissioning Instructions

3.3

Actual value sensing

C(+) M D(−)
Inverter
-U61 X4
AVT2
X5
-R41
-U41 X6 X4
X3
AVT2
X2
X5
1U2 1V2 1W2
Fig. 3.2
Three CTs/PTs are used for the actual value sensing. The electronic shunts AVT2
(refer to the description, Section "electronic shunt AVT2") is inserted in the output
circuit to sense the output currents and voltages. They measure the output currents
i and i and the output voltages U
R T
the description, Section "Voltage sensing AVT3") is bolted onto busbar M. It
measures the positive (C) and the negative (D) DC link voltage.
All of the measured values are converted into serial optical signals, and transferred
to the IAL module for evaluation via fiber-optic cable. The results are transferred to
the digital SIMADYN D control system for further processing via the SUL- and ISL
modules.
The block diagram shows the signal flow from sensing via twisted duplex fiber-optic
cables at the IAL module. In the configuring, the measured values appear at the
module connection IWE or IWE100, specified in the diagram, in function package
TRV, at processor 2.
Siemens AG 6SE8004-0BH76
SIMOVERT MV Commissioning Instructions
-U200
-R201
X6 X3
AVT3
-R200
X5 X2
X3
X2
X6
-R61
Block diagram of the actual value sensing in DC link and converter output
UZA_N
X1
UZA_P
X3
U_TS
X6
I_T
X8
U_RS
X5
I_R
X7
and U . The voltage sensing AVT3 (refer to
RS TS
IW5
IW6
IW2
IAL
IW4
IW1
IW3
45