Summary of Contents for VR Avionics TM1
- Page 1 & installation manual Updated: 21 September 2023 Copyright 2023 by VR Avionics...
- Page 2 Information in this document is subject to change without notice. VR Avionics reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes.
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Page 3: Table Of Contents
FF Fuel Flow Sensor Full-Scale Value..........................15 A1 Current Sensor/Shunt Full-Scale Value........................15 A1 Current Zero Deadband Value............................15 P1, P2 & P3 Pressure Sensor Full-Scale Value......................... 16 Factory Calibration Settings................................ 16 2023-09-21 © 2023 VR Avionics page 3 of 16... -
Page 4: Introduction
TM1 manual Introduction Thank you for choosing the TM1 turbine engine monitor for your aircraft / project. This manual describes the preparation, operation, installation, configuration, and maintenance of the TM1 line-replaceable unit(s). Should anything explained in here be unclear feel free to ask us about it. -
Page 5: Operation
(or those where the sensor or one of the sensor wires broke) will report as zero. Speeds (N1 and N2) A single TM1 unit allows for up to two speed measurements. For conformity we recommend you use N1 for N1, and N2 for N2, propeller or rotor speed should you have a split-shaft engine. -
Page 6: Fuel Flow And Count (Ff1 And Fc1)
Fuel Flow and Count (FF1 and FC1) A single TM1 unit allows one fuel flow measurement (FF1) accompanied by its fuel counter parameter (FC1). Fuel flow is measured through a pulse-based fuel flow sensor, which will have to be sourced separately. Fuel flow can be communicated in different measurement units - GPH, LPH, PPH, etc. -
Page 7: Parameters Communication
TM1 manual Parameters Communication The TM1 communicates acquired parameters (described in the previous section) via Standard Frame messages via its CAN bus interface as described in this section. CAN Bus Interface Basics Nominal bit time / rate Determined by the setting ”CAN Bus Interface Speed”... -
Page 8: Information Message #3
For more on the LSI, how it works and how to configure it, consult the LSI User Guide which you can download from our website. To get you started quickly with the TM1 and RealDash, see the LRU RealDash Quick Setup Guide which you can download from our Support web-page. -
Page 9: Dx1 Displays
10 seconds. Maintenance Support The TM1 works with an LSI to allow maintenance and support tasks to be performed. These tasks are a must to configure the TM1, update its firmware, and helps to validate operation. -
Page 10: Installation
We recommend in general the use of 20-24 gauge aircraft grade Teflon or Tefzel insulated wire for all wiring to and from the TM1 unit. We also recommend you use machined contacts (such as 205090-1) with a crimp connector housing (such as 5205207-1) and a connector hood (such as 5207908-7). -
Page 11: Temperature Sensing
The PPR pin provides 5VDC nominal power and reference to all three sensors. We recommend doing the necessary splice as close to the TM1 unit as possible and then running separate wires to each sensor along with their respective signal wires as shown. To further improve accuracy we recommend running separate ground wires from each sensor to the common grounding point shared by the TM1 unit. -
Page 12: Speed Sensing
(rate) and fuel count (fuel used) parameters FF1 and FC1. If these are not required you can leave the pins shown below open (unconnected). The FFPR pin provides 12VDC nominal power to the sensor. The TM1 also has a 4.7K ohm pull-up resistor on its FF1 pin that will accept any compatible pulse-based flow sensor. -
Page 13: Discrete Input Sensing
Discrete Input Sensing Install wires from various electrical switches and nodes to the TM1 as may be required by your application as shown in the diagram below to acquire discrete input parameters D1 to D5. If any of these are not required you can leave their pin(s) shown below open (unconnected). -
Page 14: Configuration
CAN Bus Base ID This setting sets the base ID for the standard frame (11 bit) messages the TM1 send via its CAN bus interface. To communicate and work with an LSI or DX1 the base ID needs to be set as follows:... -
Page 15: N1 & N2 Speed Sensor Full-Scale Frequency (Hz)
FF Fuel Flow Sensor K-Factor This setting sets the k-factor the TM1 will use to calculate the FF1 and FC1 parameters from the fuel flow sensor signal it gets on its FF1 input. For precision it allows for fractional adjustment to the nearest 0.01. -
Page 16: P1, P2 & P3 Pressure Sensor Full-Scale Value
This pressure rating can be in different units of pressure (PSI, Bar, KPa, etc.) as provided by the manufacturer. If this is what you want the TM1 to report in, simply enter this for this setting. If you want it reported in something else including percentage (for engine torque maybe), you can calculate the setting from the rated pressure value.
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