Lun 1794 - Synchro/Resolver to Arinc Converter
The converter is used to convert voltage signal levels from selsyns or resolvers to a digital value corresponding to the angle measured. The digital value is broadcasted on the ARINC bus.
The device has three channels (3× - XYZ, 3× - reference phase) and for each channel it is possible to set the type of input signal synchro/resolver. A logical signal informing about the validity is attached to each channel.
The converter is also capable of performing self-diagnostics; it monitors supply voltage level and input signal or its validity. If an error is detected the converter halts and signalizes error.
Typical aplication
LUN1794 is successfully instaled on L-410, L-410UVP, JAK40, TU154, An-26 and L39 aircrafts.
There are many old synchro or resolver systems there (LUN1205 Electrical gyro horizont, russian GMK gyro among others) serving as sources of analogue signals for LUN1794 output arinc interface is directly connected to safety aircraft systems from Bendix/King - Honeywell (EGPWS, TCAS System).
LUN1794 is also successfully instaled on russian Mi-171 and Mi-17V-5 helicopters. There is as the signal source for heading GMK and for roll and pitch AGB-96D, AGB-3K, ARK-15 or ARK-UD.
Systems which may serve as a source of signals:
| GMK1E | Gyro-magnetic compass |
| AGB-96D | Avia horizon |
| AGB-3K | Gyro horizon |
| AGD1 | Artificial horizon |
| TarSyn H | Three-Axis Reference |
| KEA 130A | Encoding altimeter (baro potentiometer) |
| ARK 15 (АРК15) | Automatic Radio Compass |
| ARK-UD (АРК-УД) | Radio Compass |
| ADC 2000 | Fuel and Aerometrical Computer |
| RDR 2000 | Digital Weather Radar |
| and many others... | |
Supported Airplanes and helicopters:
| Aircrafts |
| L-410, L-410UVP, L39, JAK40, TU154, Falcon 50, An-24, An-26, An-28, and many others... |
| Helicopters |
| MI-171, MI-171S, MI-171Sh, MI-172, MI-17V-5, MI-8, and many others... |
Variants specification
| Inputs | Outputs | P/N | Description |
| 3× Synchro/Resolver (ARINC407/Russian) |
ARINC429 LS/HS | LUN1794 | Synchro/Resolver to ARINC429 |
| 2× Synchro/Resolver (ARINC407/Russian) 1× Synchro DC (DESYN) |
ARINC429 LS/HS | LUN1794.1 | Synchro/Resolver and Synchro DC to ARINC429 |
| 1× Synchro/Resolver (ARINC407/Russian) 2× 1 phase gyro (ECFR 251) |
ARINC429 LS/HS | LUN1794.2 | Synchro/Resolver and 1phase gyro (ECFR 251) to ARINC429 |
| 1× Russian Synchro, vertical & lateral deviation |
ARINC429 LS/HS OBS selector(Resolver) |
LUN1794.3 | Converts analog signals of vertical deviation, lateral deviation and signals of vertical and lateral deviation validity from main output of GNS430 unit to format suitable for Russian navigation indicator NPP or similar. More converts OBS(ZK) selection from Russian NPP to GNS OBS Resolver input. |
| 1× Synchro /Resolver (ARINC407/Russian) 2× Synchro DC (DESYN) |
ARINC429 LS/HS 1x GPO Relay |
LUN1794.4 | Synchro/Resolver and Synchro DC to ARINC429 |
| 1× Synchro/Resolver (ARINC407/Russian) | ARINC429 LS/HS 1× Synchro/Resolver output (ARINC407) |
LUN1794.5 | Synchro/Resolver to ARINC429 and Synchro/Resolver (ARINC407) to connect EHSI. |
| 2× Synchro/Resolver (ARINC407/Russian) 1× DC |
ARINC429 LS/HS | LUN1794.6 | Synchro/Resolver and DC Baro Correction inHg to ARINC429 |
| 3× Synchro/Resolver (ARINC407/Russian) ARINC429 |
ARINC429 LS/HS 3x GPO Relay |
LUN1794.7 | Synchro/Resolver to ARINC429 and ARINC429 to Runway Markers (GPO Relays) |
| 2× Synchro/Resolver (ARINC407/Russian) vertical & lateral deviation & TO/FROM |
ARINC429 LS/HS | LUN1794.8 | Converts analog signals of vertical deviation, lateral deviation and TO/FROM signals. |
ARINC429 labels suported
| Label | Label name |
| 320 | Magnetic Heading |
| 321 | Drift Angle |
| 324 | Pitch Angle |
| 325 | Roll Angle |
| 235 | Baro Correction inHg |
| 162 | ADF Bearing |
| 274 | Heading Status |
| 222 | Bearing |
Technical specification
Block diagram
Peripheries
| Type Analog Input | Synchro (XYZ) or Resolver (SIN/COS) |
| Number of Channels | Three Fully Independent |
| Analog Input | 3× synchro/resolver, 3× 26V/36V 400 Hz 3× reference signal, 26V/36V 400 Hz (ARINC 407 or Russian) |
| Digital Input | 3× flag input - opto isolated |
| Communication interface | Arinc 429 RS 232 for service only |
General parameters
| Input Impedance | 20 kOhm, f=400Hz |
| Conversion Accuracy | ±0,3 ° |
| Power supply | 14...32 V DC |
| Power consumption | 5,0 W |
| Operating temperature range | -55 - 70 °C |
| Storage temperature | -55 - 85 °C |
| Humidity | max. 95 % |
| Connector | MIL-37, CAN 9 |
| Dimensions | 206 × 70 × 100 mm |
| Weight | 1500 g |
