--- Example for wiring the limit switches
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 High
azimuth right limit (view from behind antenna)
IN
2
GND EXT
IN
3
AZ Low
azimuth left limit (view from behind antenna)
IN
4
GND EXT
IN
5
El High
upper limit Elevation
IN
6
GND EXT
IN
7
El Low
lower limit Elevation
IN
8
GND EXT
IN
9
Pol High
polarization right limit (view from behind antenna)
IN
10
GND EXT
IN
11
Pol Low
polarization left limit (view from behind antenna)
IN
12
GND EXT
IN
Connect the azimuth, elevation and if available polarisation motors directly to the motor drivers.
Use shielded cable only. Take care, that the shield is connected to the PE terminal of the motor
driver and is NOT connected to the crankcase. Please refer to the schematics shipped together
with your sat-nms ACU-ODU for more detailed informations and pin descriptions. 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-ODU it has to be configured as DUAL-START for AZ, EL and if available for POL
drive.
(C) 2022, SatService GmbH
www.satnms.com
ACU-ODU-DC-UM-2209 Page 15/67
