3.3 Ordering code
Device variant
TFT-Display
Digital
Outputs
RS-485,
Modbus/RTU
AD-LU 60 FE
•
-
-
AD-LU 60 FE -D
•
•
-
AD-LU 60 FE -B
•
-
•
AD-LU 60 FE -DB
•
•
•
3.4 How it works
k1
l1
k1
l1
k1
l1
N
L1
L2
L3
ADC
uC
~
=
RS-485
A
B
M1
M2
M3
1
2
3
1
2
3
4
4
3
2
1
=
_
Display
AD-LU 60 FE
AD-LU 60 FE-D
AD-LU 60 FE-B
AD-LU 60 FE-DB
1
2
E1
K2
E2
K1
(3)
(1)
(2)
(4)
(5)
(6)
(7)
(9)
(8)
(10)
(10)
(10)
(9)
GND
The measuring voltages are divided by a voltage divider (1) and fed to the analog-
to-digital converter (4). The AC/DC converter (3) is simultaneously fed from the
measuring voltages. The AC / DC converter (3) supplies the analog-to-digital con-
verter (4) on the input side and the circuits on the output side.
The currents are first fed via the ring core current transformer (10) present on the
outside of the device. The mA signals on the secondary side are measured via shunts
(2) and are also fed to the analog-to-digital converter (4).
The analog-to-digital converter (4) transmits all raw data to the output side via a
galvanic separation (5). Here, they are scaled by the microcontroller (6) to the power
values, currents, voltages, etc. The scaled values are displayed on the display (7). For
the device variants with RS-485 interface (8), these values can also be read out via
the Modbus protocol. With the device variants with open-collector output (9), limits
8
