GHM Delta OHM LPPYRA03, Руководство по эксплуатации

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LPPYRA03
- 12 -
V2.8
4.6 LPPYRA03ACS
CONNECTIONS
The pyranometer LPPYRA03ACS 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: LPPYRA03ACS[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