Summary of Contents for Vx Aviation MakerPlane M-PWR-2 Series
- Page 1 M-PWR™-2 DUAL CHANNEL VARIABLE-SPEED TRIM MOTOR CONTROLLER WITH AUTO-TRIM THE ULTIMATE TRIM CONTROLLER™ OPEN SOURCE DESIGN VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 1 of 16...
- Page 2 Servo blue Copilot Trim Enable Switch To Servo Position Motor Speed Indicator Controls Snap-Action Flaps Switch or Airspeed Sensor Figure 1. Typical Installation of, M-PWR-2X (Baseline Version) VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 2 of 16...
- Page 3 Snap-Action Right Wing Down +12V Ground Flaps Switch or Left Wing Down Ground +12V Airspeed Sensor EFIS Figure 2. Typical Installation of M-PWR-2A or M-PWR-2AT (Enhanced Versions) VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 3 of 16...
- Page 4 Since the lamp and switch are required for EFIS mode indication and airspeed threshold programming, there are no extra hardware costs in providing input fault detection and correction. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 4 of 16...
- Page 5 8 to 18 volt operation with surge protection. Independently adjustable high and low motor speed settings for each channel. High or low speed selection using an external flaps or airspeed sensor switch. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 5 of 16...
- Page 6 Test by activating the pilot trim switches for the two channels. 5. If installed, confirm that the copilot trim switches and copilot trim enable switch are operating. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 6 of 16...
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Page 7: Ground Configuration
10. Using a screwdriver, adjust the A+ and B+ speed setting potentiometers. This sets the desired trim motor speeds for cruise flight. Test settings by activating the appropriate trim switches. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 7 of 16... - Page 8 This is a safety feature to allow manual override of trim when the autopilot is engaged. Auto-trim functions do not operate with the Garmin G3X system. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 8 of 16...
- Page 9 With both altitude/pitch and heading/track modes engaged, auto-trim is enabled on both axes. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 9 of 16...
- Page 10 PWM variable speed up to 1.2A, each channel. Short circuit protected. Controls: 0-5 VDC, 0-18 V (SPD input). Serial RS-232, EFIS input. Figure 3. Device Label Figure 4. Device PCB Assembly VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 10 of 16...
- Page 11 0.313 0.875 0.30 0.30 Ø 0.188 typ 0.30 HAMMOND 1591MFLBK 2.20 0.866 0.66 0.28 1.64 0.28 ref Figure 5. Case Machining Guide VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 11 of 16...
- Page 12 Configure it for 115,200 bits per second operation, 8 bits, no parity, 1 or more stop bits and no flow control. 8 to 18 VDC 9-pin DSUB Female Connector USB Cable USB to Serial M-PWR-2 Adapter Existing FIX Pushbutton Figure 6 Expert Tuning Setup VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 12 of 16...
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Page 13: Tuning Parameters
A negative Runtime indicates a trim motor direction reversal. T is the trim adjustment repetition period, measured in frames. T must be > 2N. The Summation function for F(n) uses saturating 16-bit integer arithmetic. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 13 of 16... - Page 14 ==== TUNING DATA IN HEXADECIMAL ==== ==================================== Speed Threshold 0384 SPD Polarity Status Integration Frame Count 0020 Pitch Direction and Attenuation Roll Direction and Attenuation Trim Adjustment Frame Count 0040 VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 14 of 16...
- Page 15 Making this number too short may cause erratic auto-trim operation. The default is 64 (0x0040 hex). This allows 8 seconds (64 frames/8 frames per second) before repeating the computation. VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 15 of 16...
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Page 16: Document Revision History
Added ability to adjust airspeed threshold and SPD input polarity from tuning port. Various wording changes made to enhance clarity. Licensed under the TAPR Open Hardware License (www.tapr.org/OHL) VXD-1305001D3 © 2013, 2014 Vx Aviation. All rights reserved. Page 16 of 16...
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