sat-nms ACU2-19 User Manual

J1.1, J2.1, J3.1 Limit switch connectors

Connector Type: Phoenix contact mini combicon FMC 1,5/4-ST-3,5

High and Low Limit switch for elevation axis. 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.

connector	pin	signal	description	type
J1.1	1	AZ Low	azimuth left limit (view from behind antenna)	IN
	2	GND EXT
	3	AZ High	azimuth right limit (view from behind antenna)	IN
	4	GND EXT

connector	pin	signal	description	type
J2.1	1	EL Low	lower limit elevation	IN
	2	GND EXT
	3	EL High	upper limit elevation	IN
	4	GND EXT

connector	pin	signal	description	type
J3.1	1	PL Low	polarization left limit (view from behind antenna)	IN
	2	GND EXT
	3	PL High	polarization right limit (view from behind antenna)	IN
	4	GND EXT

J1.2, J2.2, J3.2 Motors

Connector Type: Phoenix combicon MSTB 2,5/ 3-ST-5,08

DC motor driver output. The motor interface is designed for up to 15A/24V. Use shielded cable only to connect the motors. Connect shield to ‘PE’ Pin. Take care, that the shield is NOT connected on the motor end of the cable.

connector	pin	signal	description	type
J1.2	1	Motor AZ+	Azimuth Motor +	IN
	2	PE
	3	Motor AZ-	Azimuth Motor -	IN

connector	pin	signal	description	type
J2.2	1	Motor EL+	Elevation Motor +	IN
	2	PE
	3	Motor EL-	Elevation Motor -	IN

connector	pin	signal	description	type
J3.2	1	Motor PL+	Polarisation Motor +	IN
	2	PE
	3	Motor PL-	Polarisation Motor -	IN

J4 Analog beacon level input

Connector Type: SMA male

The ACU19 preferably is used together with the sat-nms LBRX beacon receiver. With the sat-nms LBRX the ACU talks though UDP or TCP over IP, no additional cabling is required in this case. At J4 the ACU19 provides an analog interface to third party beacon receivers.

pin	signal	description	type
center	level in	beacon level signal 0…10V DC	IN
outside	GND	signal ground

J5, J6 and J7 Angle encoders

Connector Type: D-Sub9 male

The sat-nms ACU19 provides the possibility to connect three different types of angle encoders: optical SSI encoders (S), analog potentiometers (A) and Resolvers (R). You have to decide at point of order which variant you want to have. The angle encoder type is specified by an add-on to the name of the unit. The sequence is azimuth, elevation, polarization

An example: ACU19-SSA contains SSI interfaces at azimuth and elevation axis and an analog potentiometer interface at polarization axis.

The integrated interface type is also written on a label near by the angle encoder connectors.

SSI 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 at the ACU 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 unit has to be opened and the fuse has to be replaced. Do not open the unit by yourself, you will loose warranty in that case.

pin	signal	description	type
1	0V
2	Data-	SSI data	IN
3	Clk-	SSI clock	OUT
4	+5V	encoder power supply
5	n.c.
6	Data+	SSI data	IN
7	Clk+	SSI clock	OUT
8	n.c.
9	+24V	encoder power supply

Analog angle sensor (potentiometer) interface

pin	signal	description	type
1	AGND	Analog ground	OUT
2	Ref Out	Reference voltage	OUT
3	n.c.
4	n.c.
5	n.c.
6	INPUT	A/D converter input (center Poti)	IN
7	AGND	Analog ground	OUT
8	n.c.
9	n.c.

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.

pin	signal	description	type
1	GND
2	GND	resolver SIN	IN
3	GND	resolver COS	IN
4	GND	drive signal to resolver	OUT
5	n.c.
6	SIN	resolver SIN	IN
7	COS	resolver COS	IN
8	REF	drive signal to resolver	OUT
9	GND

J8 Inclinometer

Connector Type: D-Sub9 male

This interface is not implemented yet and is reserved for further expansions

J9 Compass

Connector Type: D-Sub9 male

This interface is not implemented yet and is reserved for further expansions

J10 Remote serial

Connector Type: D-Sub9 male

This interface is not implemented yet and is reserved for further expansions

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.

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

J12 Mains input connector

Connector type: IEC male

The sat-nms ACU19 already contains all internal needed power supplies. Use any standard cable type with IEC connector. As they are wide-range types it is possible to connect nearly all worldwide available single phase mains. Please refer to chapter Specifications for more detailed informations.