The converter is used to convert voltage signal levels Synchro/Resolver to ARINC 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.
Technical parameters
Analog Input Type: Synchro (XYZ) or Resolver (SIN/COS)
Number of channels: 3 fully independent
Analog Input:
- 3x Synchro/Resolver
- 3x 26V/36V 400 Hz
- 3x reference signal, 26V/36V 400 Hz (ARINC 407 or Russian)
Digital Input:
- 3x flag input – opto isolated
Communication interface:
- ARINC 429
- RS 232 for service only
General Parameters
Input Impedance: 20 kOhm, f=400 Hz
Conversion Accuracy: ±0,3 °
Power Supply: 14…32 V DC
Power Consumption: 5 W
Operating temperature: -55 – 70 °C
Storage temperature: -55 – 85 °C
Humidity: max. 95 %
Connectors: MIL-37, CAN 9
Dimensions: 206 x 70 x 100 mm
Weight: 1500 g
Supported ARINC labels
320 – Magnetic Heading
321 – Drift Angle
324 – Pitch Angle
325 – Roll Angle
235 – Baro Correction inHg
162 – ADF Bearing
274 – Heading Status
222 – Bearing
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.
LUN1794.3 is successfully instaled on L-410, L-410UVP, JAK40, TU154, An-26 and L39 aircrafts and MI – 24, MI-17 hellicopters.
There are many old synchro or resolver systems (LUN1205 Electrical gyro horizont, russian GMK gyro among others) which can serve 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, Mi-17V-5 and MI 24 helicopters. There is as the signal source for heading GMK and for roll and pitch AGB-96D, AGB-3K, ARK-15 or ARK-UD.
Supported airplanes and helicopters
| Aircrafts |
| L-410, L-410UVP, L39, JAK40, TU154, Falcon 50, An-24, An-26, An-28, JAK40, TU154, Dassault Aviation Falcon 50, MIG 21, MIG 29, McDonnell Douglas MD-11 |
| Helicopters |
| MI-24, MI-171, MI-171S, MI-171Sh, MI-172, MI-17V-5, MI-8, Bell Helicopters |
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. |
Block diagram
