Imed PITCH ANGLE Manuel utilisateur
User Manual
I. OVERVIEW
II. FEATURES
III. Operation
V. SETUP
VI. TROUBLESHOOTING
1
1
3
6
10
VII. Specifications 13
IV. wiring 4
IMED Pitch Angle Indicator v2.0
IMED’s Pitch Angle Indicator (PAI) displays the propeller pitch angle in
real time. The design is microcontroller based which makes it easy to
configure and eliminates the need for any trim pots, etc. IMED’s PAI will
work directly off most existing pitch feedback units, basically any
potentiometer from 1kΩ to 100kΩ and utilizes CAN bus for master/slave
setups.
The PAI only needs to be set up once at the time of installation. It then
stores all the essential data in the microcontroller’s non-volatile memory.
The configuration process is simple and makes use of the three push
buttons mounted on back of the PAI.
Available angle sense inputs: 0-3.3V, 4-20mA, CAN bus
Flexible sense
inputs
Best readability under any circumstances with very high maximum
brightness.
Automatically follows the dash brightness or can be set individually to
optimize visibility. No external components required.
No more fine tuning or offset adjustments. Simple setup process derives
all required parameters. Intuitive adjustment of sensitivity.
The standalone version has backlighting included for best night time
visibility. Brightness is set automatically.
Figure 1.
IMED PAI User Interface
3
IMED Pitch Angle Indicator v2.0
As the pitch angle changes, the LED display updates according to the
angle.
When the pitch angle is less than 0°, the red ‘Astern’ section of the PAI is
active.
When the pitch angle is 0°, only the Neutral LED is active.
When the pitch angle is between 0° and Ahead, the green ‘Ahead’
section of the PAI is active.
When the pitch angle is between Ahead and Feather, the ‘Travel’ section
of the PAI is active. This shows which direction the propellor pitch is
travelling by blinking the respective arrow.
If the pitch angle stops travelling between Ahead and Feather, both
LEDs will blink to indicate that the propellor pitch has stopped moving
without reaching either Ahead or Feather.
Once the pitch angle reaches the Feather position, only the Feather LED
remains on.
LED Operation
Resolution For best performance, the potentiometer’s movement should have a
large span from Astern to Feather i.e. having a 10 turn, 10 kΩ pot, which
only does 1 full turn over the full span of the pitch will have less
resolution than that of a single turn, 10 KΩ pot doing close to one full
rotation.
The 2nd potentiometer is not required for normal operation. It may be
added to further enhance resolution and improve noise immunity (see
wiring diagram).
V+ V- 3V3 V-V+ 0V 12V LH 0V -+ PWM+
Supply POT CAN 4-20 DIM
To AI
IMED Pitch Angle Indicator v2.0
CAN
CAN 12VDC
CAN HIGH
12V
V+
V-
0V
120R
CAN termination at both ends of the bus! CAN LOW
CAN GND
4 - 20
+
-
4-20mA IN
4-20mA OUT
POT
3V3
V+
V-
0V
Potentiometer
2nd Potentiometer
(inverted, optional)
One end only
One end only
SUPPLY
V+
V-
12 ... 30VDC
GND
DIM
+
PWM
MASTER 12 ... 30VDC
MASTER PWM
The PAI has three pushbuttons labelled P/A (Pitch at Astern), C/N (Pitch
at Neutral) and S/F (Pitch at Feather). These buttons are used to setup
the PAI.
A specific setup procedure must be followed to setup the PAI for use.
The Receipt LED is located at the back of the PAI on the bottom-left
side of the pushbuttons. The receipt LED blinks green three times to
indicate when an input has been received. This LED should be used as a
visual confirmation of a value being received and saved into the PAI
memory.
D3
Receipt LED ( or )
P/A
C/N
S/F
3
IMED Pitch Angle Indicator v2.0
Switch 1 selects the dimmer input (external or internal).
If internal is used, the LED brightness is controlled with
button S5 on the top side of the PCB, or by connecting an
external 1 way IME-BTN to the 10 way header P3. If a third party
button is used, connect between pin 1 and 2 of P3.
In external mode the LED brightness is controlled by an external
dimmer connected to the DIM terminals on the I/O board (see
Figure 2).
Switch 2 selects the analogue input: potentiometer or 4-20mA.
Switch 3 selects whether the unit should act as a master or slave. In
slave mode it reads its angle from CAN bus and therefore depends on
another master. In master mode the angle is measured directly off the
The first step of the setup procedure is to configure the board using the
4 DIP switches.
DIP switch
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