The sat-nms ACU-ODU is a full featured antenna positioner and as an option antenna tracking system. The electronics of the sat-nms ACU-ODU is build into an outdoor cabinet. The protection class of the cabinet is IP66 if no optional air ventilation is installed. So it is no problem to install it outside without any additional roof.

The unit consists from the components listed in the following table. All of these components are described in the next chapters. As the unit is available in different versions (manufacturer of frequency inverters, tracking / pointing, with or without Polarisation drive ect.) the following picture shows one standard cabinet. The look and the arrangement of the units may vary depending on your demand.

(1) sat-nms ACU2-ODM: The sat-nms ACU2-ODM is the core module of the sat-nms ACU2-ODU. For the detailed operation of the antenna controller please refer to chapter 5 Operation . Another interesting chapter is belonging the ACU2-ODM is 4.3 Startup here you find also the description how to change the IP address of the unit in order to integrate the antenna controller in your subnet. A short version of the documentation could also be found on the internal website of the sat-nms ACU2-ODM. Just enter the IP-address of the unit (standard-IP is: 192.168.2.69) into the Web-browser of a connected computer and press the HELP button on the left side.

(2) Power supplies for sat-nms ACU2-ODM: In the ACU-ODU you find 2 power supplies: one is for the core processor of the ACU2-ODM, it is labeled with ‘PS ODM’. The other one supplies the external contacts of the ACU e.g. the control signals for the POL drivers relais or the limit switches. This one is labeled with ‘PS EXT’. By this, the core processor of the sat-nms ACU2-ODM will not break down if something externally happens (e.g. overload/ short circuit)

(3) Frequency Inverters: For bigger antennas most of the time three phase motors are used. These are connected to frequency inverters which are the high power interface between the sat-nms ACU2-ODM module and the motors. Please take into account that some of the frequency inverter parameters are motor dependent and that these have to be changed to your specific antenna motors. The following chapter frequency inverter description gives a short overview of the frequency-inverters operation. If you need more detailed information, please refer to the manual of the frequency inverters.

(4) Solid State Relais: If your sat-nms ACU2-ODU is equipped with the optional POL-drive, you find solid state relais in your sat-nms ACU2-ODU. The POL Motor is normally a small single phase motor that does not need a frequency inverter for driving. As an option, a third frequency inverter for POL drive can be installed.

(5) Circuit breakers: The circuit breakers disconnect the mains from the units build to the control cabinet. Every circuit breaker is labelled with the unit it is connected to.

Warning: In case of switching off all the circuit breakers it is still voltage available at the mains terminals! Install an external Mains switch to disconnect the sat-nms ACU2-ODU from mains power. If UPS power is available, use as switch that disconnects mains power and UPS power at once!

(6) Contactor: The contactor disconnects the motor’s mains when the emergency stop contact is open. Please refer to the schematics shipped together with the sat-nms ACU2-ODU to see how to connect the emergency stop switch.

(7) Terminals: Here the mains, limit- and emergency switches and (if available) POL motor is connected. Please refer to the schematics shipped together with the sat-nms ACU2-ODU to see how to connect them. The LCPI-interface-module (7b) interfaces control signals of the motor drivers by ACU2-ODM (remote control) or by optional handheld controller (local control)

(8) Heater: The sat-nms ACU2-ODU is equipped with a temperature controlled heater. This is usually installed in the cabinet’s door. In delivery state the thermostat is set to 10°C, what means as soon as the temperature in the cabinet falls below 10°C the heater switches to on state.

(9) Optional 110V transformer for Polarisation drive: In several antennas 110V Motor are used. For these antennas a transformer can optional be ordered to make the sat-nms ACU2-ODU connected to 400V AC work with these motors.

(10) Remote/Local switch: This switch selects if antenna is controlled remote by sat-nms ACU2-ODM (switch to “remote�) or local by Handheld controller (switch to “local�).

(11) Handheld interface for local control: Depending on delivered version, this MIL-connector is installed on the mounting plate in the cabinet or accessible from outside of cabinet. When remote/local switch is switched to “local� the connected handheld directly controls the frequency inverters and the relais for motor control. Limit switches are considered. So it is possible to drive the antenna even without sat-nms ACU2-ODM running. If you locally drive the antenna without installed sat-nms ACU2-ODM, no angle- and beacon-level-readout is possible in this special case.

Please pay attention: if the Remote/Local switch is set to ‘remote’, the Antenna Stop switch at the handheld is not active! This is due to the fact, that it is possible to disconnect the handheld in ‘remote’ operation. In contrast to this, the antenna Stop switch mounted to the cabinet as well as external switches connected to the sat-nms ACU2-ODU, is always active, not matter if ‘remote’ or ‘local’ is active.

You have the possibility to connect different types of handhelds:

• LCPHD-PT handheld is connected to the MIL connector. This type enables angle-readout as well as displaying the beacon level if the sat-nms ACU2-ODM is configured properly.
• Vertex/CPI PMCU: as the handheld-interface of sat-nms ACU2-ODU is fully compatible (including display interface), you can connect older PMCUs if you already might have one on site.
  
• older Versions of sat-nms Handhelds with DSUB connector (type LCPH or LCPHD) can be connected directly at the DSUB connector of the green LCPI module (7b).

(12) Antenna Stop switch: This switch is used to disable the function of all connected Motors. As soon as pressed, the contactor interrupts mains of motors. This switch has the same functionality as external Antenna Stop switches, connected to the LCPI-interface-module (7b). This switch, as well as external switches connected to the LCPI-interface-module is active in ‘remote’ as well as in ‘local’ mode. In contrast to this, the antenna Stop switch at handheld controllers connected to the sat-nms ACU2-ODU, is only active in ‘local’ operation.

(13) Optional ethernet switch: The sat-nms ACU2-ODU can be equipped with an optional Ethernet switch. By this way it is easy to connect a notebook for troubleshooting or make some parameter changes. It is also possible to integrate an optional sat-nms LBRX beacon receiver or other devices with Ethernet interface.

(14) Optional sat-nms L-Band beacon receiver: It is possible to realize a complete antenna tracking system with the sat-nms ACU2-ODU. For this it is possible to integrate a sat-nms LBRX beacon receiver into the sat-nms ACU2-ODU. So you can upgrade the sat-nms ACU2-ODU to a tracking system what is completely installed at the antenna. For this option the optional Ethernet switch is necessary as well. As the level information is in this case transferred via Ethernet (by UDP packets) between the beacon receiver and the antenna step track system the sat-nms LBRX beacon receiver not necessarily has to be installed at the same place as the antenna controller. It can be at a completely different location. The only requirement is an Ethernet connection between these 2 devices. Please refer to the documentation of the sat-nms LBRX and the sat-nms ACU2-ODM how to setup the parameters of this unit and how to connect it. A short version of the documentation could be found on the internal website of the sat-nms ACU2-ODM. Just enter the IP-address of the unit (standard-IP is: 192.168.2.65) into the Webbrowser of a connected computer and press the HELP button on the left side.

Optional air ventilation: For using the sat-nms ACU2-ODU in very hot regions, it is possible to equip the sat-nms ACU2-ODU with an optional temperature controlled fan. By this way it is possible to ensure the availability of the sat-nms ACU2-ODU in a hot ambient. ATTENTION: If the unit is equipped with an optional air ventilation, avoid contact with jets of water, rain is no problem. Through the build-in ventilator the protection class is only IP54. The thermostat for the fan is normally set to 40°C, what means the fan switches on as soon as the temperature of the cabinet raises above 40°C. We strongly recommend not to set this threshold below 40°C. The reason for this is, that in the winter the heater and the fan work against each other. In worst case the fan and the heater run parallel over a longer time. This behavior is avoided through setting the fan threshold to 40°C.

As an alternative, SatService provides sunshields for mounting directly to the cabinet. This helps keeping the cabinet temperature low in a passive way and keeps the protection class at IP66.

Optional power socket: If you like to connect electrical devices, an optional power socket is available as an option. This option is available with german “Schuko� type only.