Limit switches have to be connected directly to the sat-nms ACU-ODM, emergency switch has to be connected to the terminals bottom right of the cabinet. Please refer to the schematics for the exact cabling. The ACU treats a closed contact as OK, contacts have to be opened to indicate the ‘limit reached’ or ‘emergency stop’ condition. Opening the emergency stop contact disconnects the frequency inverters, motor drivers or conductors from mains supply immediately.
The pinout of limit switch connector is as follows:
CON16 Limit Switches
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.
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 |