J1 Three-phase current Mains Connector

Connector Type: Harting HAN B 6+PE female Power supply for the motors to be connected to the ACU-RMU

J2 Single-phase current UPS Mains Connector

Connector Type: Harting HAN A 3+PE female Power supply for the ACU-RMU core module.

J3-1 AZ Motor Connector

Connector Type: Harting HAN B 6+PE male

Connect the azimuth motor here. Use shielded cable only. Take care, that the shield is connected to J3-1 and is NOT connected to the crankcase.

The ACU knows two different configuration modes to control a motor driver. They are called ‘DIR-START’ and ‘DUAL-START’. In ‘DIR-START’ mode, the ‘FWD’ signal switches the motor on/off, the ‘REV’ signal controls the motor direction. This is the configuration many frequency inverters use. In ‘DUAL-START’ mode, the ‘FWD’ signal switches the motor on in forward direction, ‘REV’ activates the motor in reverse direction. This configuration mode is convenient to control a motor with relays. At sat-nms ACU-RMU it has to be configured as DIR-START for AZ and EL and as DUAL-START for POL.

J3-2 AZ Limit Switch Connector

Connector Type: D-Sub9 female

Connect the azimuth limit switches here.

The limit switch inputs internally are connected to the external 24V / GND rails. The switches are connected directly to the input pairs without any external ground or supply cabling. The ACU treats a closed contact as OK, contacts have to be opened to indicate the ‘limit reached’ condition.

Please note, that the left/right azimuth and polarization limit switches have to be swapped when the antenna is operated at the southern hemisphere.

J4-1 EL Motor Connector

Connector Type: Harting HAN B 6+PE male

Connect the elevation motor here. Use shielded cable only. Take care, that the shield is connected to J4-1 and is NOT connected to the crankcase.

The ACU knows two different configuration modes to control a motor driver. They are called ‘DIR-START’ and ‘DUAL-START’. In ‘DIR-START’ mode, the ‘FWD’ signal switches the motor on/off, the ‘REV’ signal controls the motor direction. This is the configuration many frequency inverters use. In ‘DUAL-START’ mode, the ‘FWD’ signal switches the motor on in forward direction, ‘REV’ activates the motor in reverse direction. This configuration mode is convenient to control a motor with relays. At sat-nms ACU-RMU it has to be configured as DIR-START for AZ and EL and as DUAL-START for POL.

J4-2 EL Limit Switch Connector

Connector Type: D-Sub9 female

Connect the elevation limit switches here.

The limit switch inputs internally are connected to the external 24V / GND rails. The switches are connected directly to the input pairs without any external ground or supply cabling. The ACU treats a closed contact as OK, contacts have to be opened to indicate the ‘limit reached’ condition.

J5 Beacon Receiver Analog Input

Connector Type: SMA male

The sat-nms ACU-RMU preferably is used together with the sat-nms LBRX beacon receiver. With the sat-nms LBRX the sat-nms ACU-RMU talks though TCP/IP, no additional cabling is required in this case. At J5 the ACU provides an analog interface to third party beacon receivers.

J5-1 POL Motor Connector

Connector Type: Harting HAN A 3+PE male

Connect the polarization motor here. Take care for the desired voltage. The standard version of the sat-nms ACU-RMU is only able to drive 230V single phase motors without brake. As an option a brake driver and/or 110V transformer is available.

The ACU knows two different configuration modes to control a motor driver. They are called ‘DIR-START’ and ‘DUAL-START’. In ‘DIR-START’ mode, the ‘FWD’ signal switches the motor on/off, the ‘REV’ signal controls the motor direction. This is the configuration many frequency inverters use. In ‘DUAL-START’ mode, the ‘FWD’ signal switches the motor on in forward direction, ‘REV’ activates the motor in reverse direction. This configuration mode is convenient to control a motor with relays. At sat-nms ACU-RMU it has to be configured as DIR-START for AZ and EL and as DUAL-START for POL.

J5-2 POL Limit Switch Connector

Connector Type: D-Sub9 female

Connect the polarization limit switches here.

The limit switch inputs internally are connected to the external 24V / GND rails. The switches are connected directly to the input pairs without any external ground or supply cabling. The ACU treats a closed contact as OK, contacts have to be opened to indicate the ‘limit reached’ condition.

Please note, that the left/right azimuth and polarization limit switches have to be swapped when the antenna is operated at the southern hemisphere.

J6 Disable Connector

Connector Type: D-Sub9 male

If you have an emergency stop button, connect it here. If you do not have one, make a bridge between Pin 1 and 8 and between Pin 2 and 9. Without these bridges the motors mains are interrupted.

J7, J8, J9 Angle Encoder Connector

Connector Type: D-Sub9 male

The sat-nms ACU-RMU is available in different configurations of angle encoders. It is possible to equip it with interfaces for standard resolvers, for optical SSI encoders or for analog sensors (potentiometers). It is possible to mix it (e.g. SSI encoder at AZ and EL and an analog sensor for POL). You have to select type of interface when you order the sat-nms ACU-RMU. A label nearby the angle connectors show which type of interface is installed.

Find below the pin description of all possibilities:

J7, J8, J9 Resolver Interface

The ACU resolver interface is designed for resolvers with an impedance of 100 Ohms or more and transfer factor 0.5. The interface applies 4Veff / 2000Hz to the resolver drive coil. It expects 2Veff at the sine / cosine inputs at the maximum positions.

When connecting a resolver to the ACU, please consider the following:

• Use a shielded, twisted pair cable.
• Connect the cable shield either to the case of the DSub9 connector or to the ground at the resolver housing. Never connect the shield at both ends, this will introduce a ground loop and cause a significant degradation of the resolver’s accuracy.

J7, J8, J9 SSI Position Encoder Interface

The SSI positional encoder may be powered from the ACU internal power supply. +5V and +24V clamps are provided at the connector. To avoid ground loops, the cable shield should be connected either to pin 1 or to the ground at the encoder housing, never at both ends. The power supply outputs are internally fused. Be aware not to cause a short circuit. If this happens, the core module of the unit has to be opened and the fuse has to be replaced.

J7, J8, J9 Analog Angle Sensor Interface

Below the pinout of an analog type positional sensor interface board is shown.

J11 LAN Connector

Connector Type: RJ45 male

J11 is the Ethernet 10Base-T / RJ45 connector. Use a standard network cable to connect the sat-nms ACU-RMU to an Ethernet hub. If you want to connect your computer and the ACU directly without using a hub, you need a crossover cable for this with swapped RX/TX lines.