This section covers the basic steps you will follow to assemble the LI-7500DS for the first time. You'll need the analyzer head, DSI box, SmartFlux 3 System, and the accessories.
Connecting the gas analyzer head cable
The head cable connects the DSI box to the sensor head. Align the notches on the cable connectors, then push in and turn the connector clockwise until it is tight. Continue to push in while tightening the connector until the connector is fully seated. The gasket must be compressed to ensure a watertight seal.
Figure 2‑1. To install the head cable, align the notches on the cable connectors, then tighten while pressing the connectors together. Repeat until the connector is fully seated.
Preparing the enclosure
Start by assembling the enclosure hardware.
Installing the system power supply cable
Connect the main power supply conduit to the small opening in the enclosure. Orient the lock-nut teeth so that they make contact with the enclosure surface. Connect the main power supply wires to terminals 3, 4 and 5.
As a good practice, be sure that your power cable is not connected to a power source until the wiring is complete. Keep the breakers in the OFF position until you are ready to power up the system.
Table 2‑1. Power wire connections for the main power supply to the enclosure.
From
Wire Color
To
Main power (-)
black
DIN Terminal 3 (bottom)
Earth ground
green
DIN Terminal 4 (bottom)
Main power (+)
red
DIN Terminal 5 (bottom)
In both the eddy covariance system enclosure (7900-050) and the Biomet Data Acquisition System enclosure (7900-126), install the three strain-relief couplings in the three bottom openings.
In the eddy covariance system enclosure (7900-050), install the Power Distribution Kit (7900-235) on the raised DIN rail. Connect the red wire lead between the top of the breaker and top right red terminal. Install one shorting block to connect all black terminals and another to connect all red terminals.
Figure 2‑2. The power distribution kit (7900-235) installed in the enclosure (7900-050).
Preparing the SmartFlux System and network switch
Follow the steps below when installing the SmartFlux System in the 7900-050 Eddy Covariance System Enclosure or 7900-126 Biomet Data Acquisition System Enclosure. If you are using a different enclosure, connect the power and data cables similarly to what is described here.
Install the USB drive
Data are recorded to the USB drive. Install the USB drive in the USB port on the SmartFlux System.
Connect the GPS antenna cable
Route the GPS cable through the left opening at the bottom of the enclosure and plug it into the GPS port on the SmartFlux System.
Connect power wires and the Ethernet cable to the SmartFlux System
Connect wire leads to the positive and negative terminals on the SmartFlux System. The black lead connects to negative (-), the red lead connects to positive (+). Plug in the 30 cm Ethernet cable that came with the SmartFlux System. There are two connections for positive (+) and two for negative (-). Use only one pair of +/- terminals.
Connect power wires to the Brainboxes network switch
Power wires connect to the positive and negative terminals on the switch. The black lead connects to terminal 1 (-), the red lead connects to terminal 2 (+).
Installing the SmartFlux System and network switch
Install the SmartFlux 2 or 3 System onto left side of the upper-right DIN rail. Insert the spring-loaded clip on the bottom edge of the DIN rail and compress the spring. Rotate it into place. Mount the switch next to it.
Connecting the component power wires
The 7900-050 and 7900-126 enclosures present different wiring options. Be sure the power supplied to the enclosure is within the upper voltage limits of attached components, but capable of providing 4 to 5 amps. Keep the breaker OFF while connecting power wires.
7900-050 Eddy Covariance System Enclosure
With the 7900-050 enclosure, keep the breaker OFF. Connect the positive (+) leads to the red terminals and the negative leads (-) to the black terminals for all components of the system. Proceed to Connecting Ethernet cables.
7900-126 Biomet Data Acquisition System Enclosure
With the 7900-126 enclosure, each component is powered individually from the power supply terminals, the DC-DC converter, or the DRM power outputs. 24-volt and 12-volt power supplies will be wired differently.
Caution: Do not short circuit the power supplies. For example, avoid connecting the V4 POWER OUT terminals from a Data Retention Module to the Power In terminals on a device that is powered from another power supply. Doing so will damage components and may present risk of a fire.
Select the power supply option that describes your system:
24 VDC power supply with Data Retention Module. This configuration uses the 24 volt output from a SunWize solar power supply. The DRM provides voltage regulation for devices that are not compatible with the 24 volt power supply.
24 VDC power supply with the TDK-Lambda DC-DC converter. With a 24 volt power supply and no Data Retention Module, the TDK-Lambda voltage regulator should be used to power devices that have maximum power supply limits lower than 24 VDC.
With a 24 VDC power supply, the DRM V3 power outputs can be used to power low-voltage components through the left 10-amp breaker and DIN terminals. Components powered in this manner include the network switch, PhenoCam, cellular gateway, satellite modem, CNF4 heater and ventilation unit (for the CNR4), or self-calibrating soil heat flux plates (HFP01SC).
Figure 2‑3. Power to two DAqMs and accessories when controlled by the DRM. One DAqM is powered from V1; the second DAqM is powered from V2 through; the 10-amp breaker and DIN terminals are powered through V3. The SmartFlux System (and thus, the sonic anemometer) is powered from V4.
Table 2‑2. Power wire connections for a system powered by a 24 VDC supply that includes a Data Retention Module.
With a 12 VDC power supply, you do not need to connect the DRM power out to the breaker or terminal strips because 12 VDC is within the limits of all components.
Figure 2‑4. Power to DAqMs when controlled by the DRM. In this example, the DAqMs are powered directly from V1 and V2 power outputs on the DRM.
Table 2‑3. Power wire connections for a system powered by a 12 VDC supply that includes a Data Retention Module.
If your system does not have a Data Retention Module, the SmartFlux System will be powered from the enclosure power terminals rather than the DRM power outputs.
Table 2‑4. Power wire connections for a system powered by 12 VDC with no Data Retention Module.
From
Wire Color
To
DRM and DAqM Ground Lugs
yellow/green
Enclosure Ground Lug
DIN Terminal 11 (bottom)
black
DAqM GND (-)
DIN Terminal 13 (bottom)
red
DAqM PWR (+)
DIN Terminal 11 (top)
black
SmartFlux System GND (-)
DIN Terminal 14 (top)
red
SmartFlux System (+)
DIN Terminal 12 (top)
black
Network Switch (-)
DIN Terminal 15 (top)
red
Network Switch (+)
DIN Terminal 11 (top)
black
Cellular/Satellite Modem (-)
DIN Terminal 13 (top)
red/white
Cellular/Satellite Modem (+)
24 VDC power supply with the TDK-Lambda DC-DC converter
The TDK-Lambda DC-DC Converter (model DPX60) regulates output voltage to about 12 VDC, which makes it possible to power low-voltage devices from a 24 VDC solar power supply. The DC-DC converter should be used to power the left 10-amp accessory breaker (and the SmartFlux System) if you have a 24 VDC power supply and no DRM.
The DC-DC converter mounts to a DIN rail in the lower right of the enclosure. Compress the spring the in the DIN clip and rotate the converter into place.
Connect the incoming power to the charge controller Input terminals (-Vi and +Vi) and connect the regulated power from the charge controller output terminals (COM and +V1) to the left breaker and DIN terminal 12. See Figure 2‑5 and Table 2‑5 for details.
Figure 2‑5. Power to a single DRM when using a 24 VDC power supply and the TDK-Lamda DC-DC Converter.
Table 2‑5. Power wire connections for a system with the TDK-Lambda DC-DC converter.
From
Wire Color
To
DRM and DAqM Ground Lugs
yellow/green
Enclosure Ground Lug
DIN Terminal 2 (top)
black
TDK-Lambda Input 1 (-Vi)
DIN Terminal 6 (top)
red
TDK-Lambda Input 2 (+Vi)
TDK-Lambda Output 3 (COM)
black
DIN Terminal 12 (bottom)
TDK-Lambda Output 4 (+V1)
red
Left Breaker (bottom)
DIN Terminal 11 (bottom)
black
DAqM GND (-)
DIN Terminal 13 (bottom)
red
DAqM PWR (+)
DIN Terminal 11 (top)
black
SmartFlux System GND (-)
DIN Terminal 14 (top)
red
SmartFlux System (+)
DIN Terminal 12 (top)
black
Network Switch (-)
DIN Terminal 15 (top)
red
Network Switch (+)
DIN Terminal 11 (top)
black
Cellular/Satellite Modem (-)
DIN Terminal 13 (top)
red/white
Cellular/Satellite Modem (+)
Connecting the gas analyzer power wires
Power wires for the gas analyzer connect to terminals in the enclosure. With the eddy covariance system enclosure (7900-050) and Power Distribution Kit (7900-235), connect the red and black power wires leads to corresponding red and black terminals. With the Biomet Data Acquisition System enclosure (7900-126), connect the leads as described in Table 2‑6.
Table 2‑6. Power wire connections for the Biomet Data Acquisition System.
From
Wire Color
To
Terminal 17 (bottom)
black
LI-7500DS Power (-)
Terminal 19 (bottom)
red
LI-7500DS Power (+)
Connecting Ethernet cables
Ethernet cables connect the SmartFlux 3 System and gas analyzer to the network switch. Vacant ports on the network switch are for other networked components, such as the cellular gateway, PhenoCam, LI-7700, or connecting a PC.
Figure 2‑6. Install Ethernet cables to connect the SmartFlux 3 System and LI-7500DS to the Network Switch.
Connecting sonic anemometer data and power cables
The SmartFlux 3 System can record digital data from a number of sonic anemometer models. These are described below. Power for the sonic anemometer is provided through the SmartFlux System.
A combined power and data cable is available for the Gill WindMaster/Pro sonic anemometers. The sonic anemometer will be configured automatically when it is connected to the SmartFlux System and selected in the software. The cable connects to one of the digital I/O ports on the SmartFlux System (port 1 recommended).
Table 2‑7. WindMaster/Pro data and power cable wire colors and pin assignments.
A combined power and data cable is available for the Gill HS-50 or R3-50 sonic anemometers. The sonic anemometer will be configured automatically when it is connected to the SmartFlux System and selected in the software. The cable connects to one of the digital I/O ports on the SmartFlux System (port 1 recommended). The R3 uses the same cable as the HS, but the cable connects to the base of the R3 rather than the electronics control unit.
Important: At least 13 VDC must be supplied when using a 50 meter power cable because of voltage drops.
Table 2‑8. Wire assignments for the HS-50 data and power cable. The three black wires are bundled with their counterpart in the cable.
Power and data cables are available for the Campbell Scientific, Inc. CSAT3 sonic anemometers. The sonic anemometer will be configured automatically when it is connected to the SmartFlux System and selected in the software. The cable connects to digital I/O Port 1 on the SmartFlux System.
Important: The CSAT3 requires 10 to 16 VDC. Supplying an incoming 24 VDC to the SmartFlux System will damage a CSAT3.
Table 2‑9. CSAT3 data and power cable terminal connections.
You can use a Campbell Scientific, Inc. CSAT3B sonic anemometer with the data cable (part number 7900-464-x) and power cable (part number 7900-462-x). The CSAT3B anemometer must be configured before it will work with the SmartFlux System. Using the Campbell Scientific Device Configuration Utility, apply the following settings.
Parameter Name
Correct Setting
Communication Protocol
RS-485 Enabled
RS-485 Baud Rate
115200
Unprompted Output Port
RS-485 Port
Unprompted Output Rate
50 Hz
Operating Mode
Unprompted Output - No Filters
The cable connects to one of the digital I/O ports on the SmartFlux System (port 1 recommended).
Table 2‑10. CSAT3B data and power cable pin assignments and colors.
A combined power and data cable is available for the Metek Multi-Path Class A and Cage sonic anemometers. The Class A has an electronic box between the head and SmartFlux; the Cage connects directly. The anemometer will be configured automatically when it is connected to the SmartFlux System and selected in software. The cable connects to one of the digital I/O ports on the SmartFlux System (port 1 recommended).
SmartFlux Terminal
SmartFlux Label
Wire color
9
RS-422/485 RX-
Green
8
RS-422/485 RX+
Yellow
7
RS-422/485 TX-
Brown
6
RS-422/485 TX+
White
2
Power Out (-)
Pink
1
Power Out (+)
Gray
Heaters are powered by the system power supply, typically.
Heater Wire
Color
Connects to
Power GND
Black | Purple
Terminals 1 to 3
Power (+24 VDC)
Blue | Red
Terminals 5 to 7
Ground
System ground
Important: Refer to the Metek MP instruction manuals for details about operating the heater in low-voltage and over-voltage conditions.
A combined power and data cable is available for the RM Young 81000 series sonic anemometers. The anemometer will be configured automatically when it is connected to the SmartFlux System and selected in software. The cable connects to one of the digital I/O ports on the SmartFlux System (port 1 recommended).
Table 2‑11. RM Young data and power cable wire colors and pin assignments.
SmartFlux Terminal
SmartFlux Label
RM Young Label
Wire Color
9
RS-422/485 RX-
B1
White/Green
8
RS-422/485 RX+
A1
Green
7
RS-422/485 TX-
B2 (RX)
White/Orange
6
RS-422/485 TX+
A2 (TX)
Orange
5
Signal Return
SREF
White/Red
2
Power Out (-)
PWR REF
White/Blue
1
Power Out (+)
+PWR
Blue
There are three shorting block jumpers in the anemometer that must be in the correct position. Two jumpers connect each pair of middle pins at W6. One jumper connects the two pins at W5.
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