Micro Autonomations Fan Controller v3 Manuale utente
Micro Autonomations LLC –Fan Controller v3
1
Document Rev 1.0
Fan Controller v3
Micro Autonomations LLC
www.ma-embedded.com
© 2014
Description
This controller was designed to control C-Class fans from Mercedes. It will work with any standalone
temperature sensor, or it may piggyback on any 5v EFI temperature sensor. Use, described in more
detail later, entails entering programming mode to set the turn on and 75% fan speed temperatures.
The controller will command the fan speed linearly between and above those two temperature set
points.
As a safety feature, if the controller does not detect a temperature sensor, it will turn the fan on; or, if
the active sensor wire gets grounded, it will turn the fan on.
Micro Autonomations LLC –Fan Controller v3
2
Document Rev 1.0
Contents
List of Figures ............................................................................................................................................ 2
Revision History ............................................................................................................................................ 2
Theory of Operation...................................................................................................................................... 3
Maximum Voltage Specifications.................................................................................................................. 4
Pin Diagram................................................................................................................................................... 4
Signal Descriptions........................................................................................................................................ 5
Onboard status LEDs..................................................................................................................................... 7
Wiring Diagrams –One Terminal Sensor ...................................................................................................... 8
Wiring Diagrams –Two Terminal Sensor.................................................................................................. 9
Wiring Diagrams –EFI Sensor ................................................................................................................. 10
Wiring the Fan.............................................................................................................................................11
Recommended sensors............................................................................................................................... 11
Compatibility...............................................................................................................................................12
Programming the controller ....................................................................................................................... 13
Error Modes ................................................................................................................................................16
Troubleshooting..........................................................................................................................................17
Mounting the controller ............................................................................................................................. 18
Warranty .....................................................................................................................................................19
List of Figures
Figure 1 –Fan speed vs. Engine Temperature.............................................................................................. 3
Figure 2 - Pin Diagram................................................................................................................................... 4
Figure 3 - Installing the Remote Status LED to operate either Red or Green............................................... 7
Figure 4 - Wiring with a one terminal temperature sensor installed ........................................................... 8
Figure 5 - Wiring with a two terminal temperature sensor installed ........................................................... 9
Figure 6 - Wiring using a 0-5v EFI temperature sensor............................................................................... 10
Figure 7 - Fan plug wiring............................................................................................................................ 11
Figure 8 - Programming Flowchart ............................................................................................................. 13
Figure 9 - Controller mounting dimensions ................................................................................................18
Revision History
Document version
Changes
Date
Rev 1.0
Initial Release
April 7, 2014
Micro Autonomations LLC –Fan Controller v3
3
Document Rev 1.0
Theory of Operation
The v3 controller has been designed to work in a variety of different systems. It can work with any
standalone temperature sensor, or it may piggyback off any 0-5v EFI temperature sensor. The controller
is able to detect and operate properly with both positive and negative going temperature sensors.
During programming, the controller detects whether the EFI or standalone temperature sensor input is
active. The controller is then able to use this information to aid in detecting various error modes.
During normal operation, the controller reads the current temperature at a rate of once a second. It
then checks several different factors in determining whether to turn the fan on or off, or what speed to
command the fan to operate at. The fan can operate at any speed between 25% and 90%.
After programming, the controller contains two temperature points: the turn on temperature, where
the fan will turn on to 25% speed, and the 75% temperature, where the fan will operate at 75% speed.
In the figure below, the controller has been programmed with pre-set temperature range #1, with a turn
on temperature of 170°F, and a 75% temperature of 185°F. As the engine temperature rises and
reaches the turn on point, the fan will turn on to 25%. As the engine temperature continues to rise, fan
speed will increase linearly until it reaches 75% speed at 185°. If the engine temperature still continues
to rise, fan speed will continue to increase until it reaches its full speed of 90% at 190°.
Figure 1 –Fan speed vs. Engine Temperature
As the engine temperature decreases, fan speed will also decrease, eventually reaching the 25% turn on
temperature. If the engine temperature continues to decrease below the turn on temperature, it will
maintain 25% fan speed until the engine temperature has dropped approximately 3-5°F below the turn
on temperature. Once the engine temperature is below this hysteresis point, the fan will turn off and
await the need to turn on again.
Micro Autonomations LLC –Fan Controller v3
4
Document Rev 1.0
Maximum Voltage Specifications
Maximum input voltage: 18v DC
Maximum voltage on AC input pin: 18v
Maximum voltage on pins 4 and 5: 5v
Do not apply external voltage to any pins other than 1, 3, 4, and 5.
We recommend using 18awg wire to install the controller. Nothing larger is necessary.
Pin Diagram
Figure 2 - Pin Diagram
Name
Color
Pin Number
Switched 12v Input
Red
1
Trigger Output
Green
2
Air Conditioning Input
Brown
3
Standalone Temperature Sensor (+)
Orange
4
EFI Temperature Sensor
Purple
5
Ground
Black
6
Speed Output
Yellow
7
Not Used
8
Standalone Temperature Sensor Return (GND)
White
9
Remote Status LED
Gray
10
Micro Autonomations LLC –Fan Controller v3
5
Document Rev 1.0
Signal Descriptions
Switched 12v –Red - 1
Main power input to the controller. This must be from a switched source so the controller is off when
the vehicle is off and during cranking. A 5 amp inline fuse is recommended.
Ground –Black - 6
Main ground for the controller. This must have a good connection to ground. This should be wired such
that it is near the main ground point near the battery. The engine ground strap, and the ground for the
fan, should also be located in the same spot.
Note:
Power and Ground to the fan are separate from the controller power and ground, and should include an
inline 50A fuse/breaker minimum
Trigger Output –Green - 2
This is the On/Off signal to the Mercedes Fan. Do not apply any external voltage or ground to this pin.
Do not reverse this wire with the Speed wire. This signal is required for the fan to operate.
Speed Output –Yellow - 7
This is the variable duty cycle speed signal to the Mercedes Fan. Do not apply any external voltage or
ground to this pin. Do not reverse this wire with the Trigger wire. This signal is required for the fan to
operate.
Air Conditioning Input –Brown - 3
This input indicates that the air conditioning (AC) system is operating, and that the fan should be turned
on. This pin may be either grounded, or tied to +12v by the air conditioning system, typically through
the trinary switch. This may also be controlled by a switch to manually turn the fan on. There is a 5
second delay after this signal is active before the fan turns on, and another 5 second delay before it is
turned off. When activated, the fan will operate at 50%. If the engine temperature requires it, fan
speed will automatically increase above 50%.
Note:
This input is optional, and may be left unused.
Standalone Temperature Sensor (+) –Orange - 4
Two Terminal Temperature Sensor –Either terminal may go on this pin. The other terminal
should go to Standalone Temperature Sensor Return (GND).
Single Terminal Temperature Sensor –The one terminal must go to this pin. The body of the
sensor must have a good connection to ground.
Micro Autonomations LLC –Fan Controller v3
6
Document Rev 1.0
Note:
Use this input only if there are no other EFI/gauge connections to the temperature sensor. Connecting
this input to an EFI/gauge signal could change the temperature reported to the EFI system, causing
significant issues.
Standalone Temperature Sensor Return (GND) –White - 9
This pin is internally connected to ground. When using a two terminal temperature sensor, connect one
terminal to this pin. Leave this pin unused when using a single terminal temperature sensor.
EFI Temperature Sensor –Purple - 5
This input may be connected to a temperature sensor connected to an EFI computer system. Its input
range is 0v-5v. Some aftermarket temperature gauges may use a 0-12v signal –verify this before
splicing this wire into the temperature sensor wire. Both positive or negative going sensors may be used
with the controller.
Note:
Use this input if you are piggybacking on the temperature sensor used by MegaSquirt, or any other EFI
system, even if it uses the standard GM sensor
Remote Status LED –Gray - 10
This output may drive the included LED which can be mounted remotely within view of the driver. The
LED is dual color, but only one color may be chosen during installation. Install the Red wire from the LED
to this pin for a Red color, and the other wire to ground. Or, reverse the colors for a Green status light.
The LED requires a ¼” hole to mount in, and has 6” long tinned wires.
The controller is designed to drive an LED with a forward voltage of 2v-2.2v, while supplying 12mA. Any
other suitable LED may be used if desired to match existing indicator lights on the dash. Contact me to
verify that your LED will work if you have any questions.
Mode
Action
Vehicle start
After doing a self-check, if no errors found, the Remote Status LED will be solid for 5 seconds
Fan turns On
When the fan turns on, the Remote Status LED will be solid for 5 seconds, then blink once
Fan turns Off
When the fan turns off, the Remote Status LED will be solid for 5 seconds, then blink twice
Air Cond. is
activated
When the fan is activated by the air conditioning signal, the Remote Status LED will be solid
for 5 seconds, then blink three times
Error
If there is an error, the Remote Status LED will blink in a pattern of 2, 3, or 4 blinks. See the
‘Error Mode’ section for explanation of each code.
Fan at full
speed
If the temperature requires the fan to operate at full speed, the Remote Status LED will turn
on steady until the fan speed drops below full speed
Micro Autonomations LLC –Fan Controller v3
7
Document Rev 1.0
Figure 3 - Installing the Remote Status LED to operate either Red or Green
Onboard status LEDs
There are two LEDs that show the current operating status of the controller.
Mode
Status LED
Error LED
Operating normally, fan off
Off
Green
Fan on
Green->Orange->Red gradient, depending on fan
speed
Green = 25%, Orange = 50%, Red = 90% (full speed)
Green
Error
Red
Blinking error
code
Programming
Various
Various
Micro Autonomations LLC –Fan Controller v3
8
Document Rev 1.0
Wiring Diagrams –One Terminal Sensor
Figure 4 - Wiring with a one terminal temperature sensor installed
Micro Autonomations LLC –Fan Controller v3
9
Document Rev 1.0
Wiring Diagrams –Two Terminal Sensor
Figure 5 - Wiring with a two terminal temperature sensor installed
Micro Autonomations LLC –Fan Controller v3
10
Document Rev 1.0
Wiring Diagrams –EFI Sensor
Figure 6 - Wiring using a 0-5v EFI temperature sensor
Indice
