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

pin signal description type
1 Phase 1 IN
2 Phase 2 IN
3 Phase 3 IN
4 neutral conductor IN
5 n.c.
6 n.c.
PE grounding conductor

J2 Single-phase current UPS Mains Connector

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

pin signal description type
1 Phase IN
2 neutral conductor IN
3 n.c. IN
PE grounding conductor

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.

pin signal description type
1 Phase 1 OUT
2 Phase 2 OUT
3 Phase 3 OUT
4 n.c.
5 n.c.
6 n.c.
PE grounding conductor

J3-2 AZ Limit Switch Connector

Connector Type: Harting HAN A 4+PE male

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.

pin signal description type
1 AZ Hi CW Limit IN
2 AZ Lo CCW Limit IN
3 GND_EXT
4 n.c.
PE grounding conductor

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.

pin signal description type
1 n.c.
2 n.c.
3 n.c.
4 Phase 1 OUT
5 Phase 2 OUT
6 Phase 3 OUT
PE grounding conductor

J4-2 EL Limit Switch Connector

Connector Type: Harting HAN A 4+PE male

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.

pin signal description type
1 EL Hi upper Limit IN
2 EL Lo lower Limit IN
3 GND_EXT
4 n.c.
PE grounding conductor

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-RMU provides an analog interface to third party beacon receivers.

pin signal description type
Pin Beacon Level beacon level signal 0..10V IN
case GND

J6 Disable Connector

Connector Type: Amphenol MS3106A 20-27p

If you have an emergency stop button, connect it here. If you do not have one, make a bridge between Pin A and B and between Pin C and D. Without these bridges the motors mains are interrupted.

pin signal description type
A 24V_EXT OUT
B K1+ disable contactor input + IN
C GND_EXT OUT
D K1- disable contactor input - IN
E n.c.
F n.c.
G n.c.
H n.c.
I n.c.
J n.c.
K n.c.
L n.c.
M n.c.
N n.c.
O n.c.
P n.c.

J7, J8 SSI Angle Encoder Interface

Connector Type: Amphenol MS3106A 18-1p

The sat-nms ACU-RMU is available in different configurations of angle encoders. The standard configuration is a SSI interface for optical encoders.

On demand, it is also possible to equip it with interfaces for standard resolvers or for analog sensors (potentiometers). It is possible to mix it as well (e.g. SSI encoder at AZ and EL and an analog sensor for POL). If you like to have another than a SSI interface, you have to select the desired type when you order the sat-nms ACU-RMU. A label nearby the angle connectors show which type of interface is installed. If no label is applied, the standard SSI interfaces are installed.

Find below the pin description of the standard SSI interface:

The SSI positional encoder may be powered from the ACU internal power supply. +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.

pin signal description type
A +24V encoder power supply OUT
B GND encoder power supply OUT
C +24V encoder power supply OUT
D GND encoder power supply OUT
E SSI DAT+ SSI data IN
F SSI DAT- SSI data IN
G SSI CLK+ SSI clock IN
H SSI CLK- SSI clock IN
I PE grounding conductor
J PE grounding conductor

J11 MNC Connector

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.

pin signal description type
1 TX+ default Ethernet cabling (10Base-T) OUT
2 TX- OUT
3 RX+ IN
4
5
6 RX- IN
7
8