Assembling the system

In this section we describe how to assemble the system and install power and communication cables between Data Acquisition Modules (DAqMs), Data Retention Modules (DRMs), and the SmartFlux 2 or 3 System. Your exact setup may differ a little from what is described here, depending on the components purchased.

Initial assembly

The basic assembly instructions are given here.

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)

Installing strain relief couplings

Three strain relief couplings fit into the openings in the bottom of the enclosure. Orient the lock-nut teeth so that they make contact with the enclosure surface.

Installing system power supply wires

Install the wire leads from the accessories kit. These distribute power from the breakers to the DIN terminals.

Table 2‑2. Power wires that connect the main power input to breakers and terminals.
From Wire Color To
DIN Terminal 3 (top) black DIN Terminal 18 (bottom)
DIN Terminal 4 (top) green/yelllow Ground lug
DIN Terminal 7 (top) red Right breaker (bottom)
Left breaker (top) red DIN Terminal 16 (top)
Right breaker (top) red DIN Terminal 22 (top)

Installing the backup battery

If you do not have the backup battery, skip this step. The backup battery, in combination with the DRM, will continue to power some components while powering off others by activating or deactivating switched power supplies if the main power supply goes down. The DRM charges the backup battery during normal operation.

The battery is to be installed under the DAqM plate, between the two risers. The cable has a connector with bare leads that connect to the DRM. Begin by connecting the bare leads to the DRM. To prevent the battery from becoming discharged, leave the connector disconnected until you are ready to deploy the system.

Figure 2‑1. Installation and wiring for the backup battery and DRM.
From Wire Color To
Backup battery black DRM POWER IN GND
Backup battery red DRM POWER IN +12V BAT

Installing the DRM and DAqM

The DAqMs and DRM should be mounted to the DIN rails on the left side of the enclosure. The SmartFlux System and network switch should be mounted to the upper DIN rail on the right side of the enclosure.

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.

Insert a USB storage device into 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 the GPS antenna cableConnect the GPS antenna cable

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 the power wires

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 (+).

Brainboxes power wires

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.

Mount the SmartFlux SystemInstall the network switch
Biomet enclosure assembled

Installing power and ground wires for components

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

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).

Wiring a biomet data acquisition system
Figure 2‑2. 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 2‑3. Power wire connections for a system powered by a 24 VDC supply that includes a Data Retention Module.
From Wire Color To
DRM and DAqM Ground Lugs yellow/green Enclosure Ground Lug
DIN Terminal 1 (top) black DRM POWER IN GND (-)
DIN Terminal 5 (top) red DRM POWER IN +9-30 VDC (+)
DRM V1 Power GND black DAqM 1 GND (-)
DRM V1 Power +12V1 red DAqM 1 PWR (+)
DRM V2 Power GND black DAqM 2 GND (-)
DRM V2 Power +12V2 red DAqM 2 PWR (+)
DRM V3 Power GND black DIN Terminal 12 (bottom)
DRM V3 Power +12V3 red Left Breaker (bottom)
DRM V4 Power GND black SmartFlux System (-)
DRM V4 Power +12 V4 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 (+)

12 VDC power supply with 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 2‑3. 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 2‑4. Power wire connections for a system powered by a 12 VDC supply that includes a Data Retention Module.
From Wire Color To
DRM and DAqM Ground Lugs yellow/green Enclosure Ground Lug
DIN Terminal 11 (bottom) black DRM POWER IN GND (-)
DIN Terminal 13 (bottom) red DRM POWER IN +9-30 VDC (+)
DRM V1 Power GND black DAqM 1 GND (-)
DRM V1 Power +12V1 red DAqM 1 PWR (+)
DRM V2 Power GND black DAqM 2 GND(-)
DRM V2 Power +12V2 red DAqM 2 PWR (+)
DRM V4 Power GND black SmartFlux System (-)
DRM V4 Power +12 V4 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 (+)

12 VDC power supply with no 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 2‑5. 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.

Full documentation for the TDK-Lambda DC-DC converter is available from the manufacturer's website: us.tdk-lambda.com/lp/products/dpx-series.htm.

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 2‑4 and Table 2‑6 for details.

DAqM power
Figure 2‑4. Power to a single DRM when using a 24 VDC power supply and the TDK-Lamda DC-DC Converter.
Table 2‑6. 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 (+)
DAqM power

Installing data cables

Communication is handled through RS-485, SDI-12, and Ethernet cables.

Connecting RS-485 data cables

Each DRM and DAqM has RS-485 terminals labeled as DATA IN and DATA OUT. Although the communication is bidirectional, the labels describe the "flow" of readings through the unit toward the SmartFlux System. DATA IN receives biomet data from a DAqM. DATA OUT sends biomet data to a DRM, DAqM, or the SmartFlux System.

Table 2‑7. Data cable wiring for DRMs and DAqMs.
From DATA OUT Wire Color To DATA IN or SmartFlux System
TX- white/green RX-
TX+ green RX+
RX- white/yellow TX-
RX+ yellow TX+
RTN black RTN or Signal Return
Figure 2‑5. Wiring to connect a DAqM or DRM to the SmartFlux System.
Figure 2‑6. Wiring to connect one DAqM to another DAqM.

For a DRM and one or more DAqMs

Data cables for a system with two DAqMs are installed as shown in Figure 2‑7.

Figure 2‑7. RS-485 wire bundles are installed between two DAqMs, a DRM, and a SmartFlux System.

For a solitary DAqM

The data cable for a system with one DAqM and no DRM is installed as shown in Figure 2‑8.

Figure 2‑8. In a setup with a single DAqM, the RS-485 wire bundle connects the DAqM to the SmartFlux System.

Connecting SDI-12 data wire leads

Red, blue, and black wire leads connect the SDI-12 terminals to the to the DIN terminals.

Figure 2‑9 . The SDI-12 wires leads connect to the DIN terminals 8, 9, and 10.
Table 2‑8. SDI-12 terminals from one DAqM to DIN terminals.
From Wire Color To
SDI-12 DAT blue DIN Terminal 8
SDI-12 GND black DIN Terminal 9
SDI-12 12V red DIN Terminal 10

Connecting network data cables

Network cables connect the SmartFlux System and gas analyzer to the network switch. Vacant ports on the network switch are for other networked components, PhenoCam, LI-7700, or connecting a PC. If you have an RV50X cellular modem, leave its Ethernet cable disconnected until you are done configuring the instrument network.

Connect network cables
Figure 2‑10. A network cable connects the system to an LI-7500A/RS/DS or LI-7200/RS. To connect to a computer, install another network cable between the switch and the computer.

Connecting PhenoCam data and power cables

Note: The StarDot NetCam SC (PhenoCam) has been discontinued by the manufacturer and is no longer available for purchase.

The PhenoCam data cable connects to the network switch. The power wires connect to terminals in the enclosure.

From Wire Color To
PhenoCam Power (GND) black Terminal 11
PhenoCam Power (+12 VDC) red Terminal 14