LPPYRA02
- 13 -
V2.6
4.6
LPPYRA02ACS[4]
CONNECTIONS
The pyranometer LPPYRA02ACS[4] has two outputs:
•
One
4…20 mA
output, requiring
10…30 Vdc
external power supply. It is to be
connected to a power supply and an instrument with 4…20 mA input as shown in
fig. 4.6. The load resistance of the instrument reading the signal must be
≤ 500 Ω
.
•
One
RS485 Modbus-RTU
output, requiring
5…30 Vdc
external power supply.
It is to be connected to a power supply and to a PLC, a data logger or a
RS485/USB or RS485/RS232 converter for PC as shown in fig. 4.6. The RS485
output is not isolated.
Connector
Function
Color
1
Power supply negative (GND)
Blue
2
Power supply positive (+Vdc)
Red
3
Digital and analog ground
(SGND)
Black
4
RS485 A/-
Brown
5
RS485 B/+
White
6
Housing / Cable shield (SH)
Black (thick wire)
7
Analog output positive (AOUT)
Green
8
Not connected
R
220
T
Ω
Shield
Shield
Lmax = 1200m
B/+
A/-
1
2
3
4
5
6
7
8
B/+
A/-
SGND
+Vdc
GND
4...20 mA
AOUT
SGND
GND
+Vdc
A/-
B/+
SH
R
220
T
Ω
Fig. 4.6: LPPYRA02ACS[4] connections
Before connecting the pyranometer to the RS485 network, set the address and the
communication parameters, if different from the factory preset (see chapter 6).
Power supply
CPM12-8DA… cable
Pyranometer M12
male connector
PLC, data logger or
RS485/USB or
RS485/RS232
converter for PC
Other sensors with
RS485 output
Connect to ground only if it is not possible to
ground locally the housing of the pyranometer
