Micro Autonomations Fan Controller v3 Manual de usuario

Micro Autonomations LLC –Fan Controller v3

Document Rev 1.0

Fan Controller v3

Micro Autonomations LLC

www.ma-embedded.com

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

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

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

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

Trigger Output

Green

Air Conditioning Input

Brown

Standalone Temperature Sensor (+)

Orange

EFI Temperature Sensor

Purple

Ground

Black

Speed Output

Yellow

Not Used

Standalone Temperature Sensor Return (GND)

White

Remote Status LED

Gray

Micro Autonomations LLC –Fan Controller v3

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

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

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

Micro Autonomations LLC –Fan Controller v3

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

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

Document Rev 1.0

Wiring Diagrams –EFI Sensor

Figure 6 - Wiring using a 0-5v EFI temperature sensor

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