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Load Control Systems for DYNertia3 ('closed loop' brake dyno control)


Eddy Current Brake Dyno (dynamometer) kitPWM Brake Dyno (dynamometer) kitRetarder Dyno Software. Home Made DIY dynamometer

Converting older dyno's or designing from scratch, sophisticated retarder control is easy!


With the addition of one of our load controllers you can completely replace outdated dyno control systems or design your own DIY custom dyno equipment. Suitable for engine or chassis style dyno, large or small.


Our load controllers work in conjunction with the DYNertia3 system, so it is important you also view the DYNertia3 page for all relevant information and the many included features.


The load control system communicates with special DYNertia3 software and implements full 'closed loop' control. Its tunable PID control ensures the target RPM/speed is quickly and accurately met and held. This allows the dyno to perform automated 'ramp' tests, 'step' tests, user designed 'profiles' or even just be manually controlled from within the software or via a potentiometer (knob, lever or pedal).


There are two types of units we offer and they differ in the way their output signal can be used -


EC- The Eddy current controller is wired into the workshops mains supply and can provide up to 192VDC and 25A to directly control an Eddy current brake (retarder). Most 12/24V retarders can be configured to run from 192V (coils in series) and this is how most existing Eddy current dyno's are already configured.


PC- The PWM controller provides a variable pulse (PWM) signal that can be used to drive retarders that are configured for lower voltage operation. The output must be connected to the retarder via a 'driver' to handle the high current, this is usually a device such as a transistor or MOSFET.


Brake (absorber) type dynos apply a load (e.g. Eddy current brake) against the engine and the torque applied is measured on your ‘load cell’.  This is typically an 'S-beam' type (requires an amplifier) but can be the signal from a pressure sensor (hydraulic load cell) or a potentiometer (mechanical load cell).

Even a precision rotational sensor is included with the kit to be used with your dyno's ‘trigger wheel’, typically a toothed iron gear (or precision drilled plate).

Key Dyno System Features -

  • Eddy current controller (EC) directly provides and controls up to 192VDC operating voltage for Eddy current retarders. Suitable for multiple mains voltages (110 VAC- 250VAC and 50Hz or 60Hz)

  • Software provided allows configuration and saving off automated tests. You can setup for 'ramp' and 'step' tests or even create your own 'user' test profiles.

  • Suitable for chassis or engine brake (absorber) dyno designs, either direct or indirect drive.

  • PID tuning software is incorporated to allow setting up the 'closed loop' control for optimal performance.

  • Servo output allows fully automated or manual control of a throttle via a conventional servo motor. The throttle operation can be controlled from within your test sequence, whether it be 'ramp', 'step' or a 'user profile' test. Input is provided for a potentiometer to be connected, this allows the throttle to also be controlled from knob, lever or pedal.

  • 2 user outputs are available (in addition to DYNertia3's) that can drive 'solid state' relays for operating accessories.

Dyno Software - Dyno System Features

Click here for EC/PC related software images (test control)

Dyno Software Images

Click here for general software images (dyno recording and display)


Click on the icons below to view the attached manual and guides for further information-

DTec Dynertia Dyno Manual, Home Made DIY Dynamometer DYNertia3 Manual

Eddy Current Chassis Dyno Quick Start

Eddy Current Chassis Dyno Quick Start
Eddy Current Engine Dyno Quick Start Eddy Current Engine Dyno Quick Start

Coming Soon

PWM Engine Dyno Quick Start
Chassis Dyno Design Tool Brake Chassis Dyno Design Tool Engine Dyno Design Tool Brake Engine Dyno Design Tool

What you may need to provide -

  • Brake assembly (the actual mechanical dyno parts)

  • You will need to have a load sensor to provide torque input to DYNertia3. This can be a load cell (typically an 'S-beam' type load cell), the signal from a pressure sensor (hydraulic load cell) or a potentiometer (older style mechanical load cell- not recommended).

  • A 'trigger wheel' (iron gear or drilled disc) for the speed sensor to detect retarder RPM. We suggest about 60 'teeth' (must be an even number).

  • PC with USB ports, Eddy current controller (EC) requires 12-18VDC power supply (to suit your local mains voltage), associated wiring.

  • Eddy current controller (EC) control unit has 'fly leads' for mains connection and a Qualified electrician is required for this connection.

What we provide with DYN3-EC or DYN3-PC kits-

  • EC or PC Electronic unit

  • DYNertia3 Electronic unit

  • Load cell amplifier (not included with basic EC unit, only DYN3-EC or DYN3-PC kits)

  • Speed Sensor

  • High speed USB hub and isolator

  • Printed 'quick start' guides

  • DYNertia3 / Load controller Software (CD)

Popular Accessories -

The accessories below may be required if you do not have an equivalent available, others may help gather additional data for analysis.  'Click' on the links for full descriptions.



Description Part #
RPM Adapter Secondary RPM Input RPM1
Load Cell Load Cell - 'S' Type SLC200/500
Load Cell Amplifier Load Cell Amplifier LCAMP
Weather Watch Automatic Weather Station WW1
AFR controller AFR / Lambda sensor WB2
Thermo-Amp Thermocouple Amplifier TC-A
Thermocouple Probes Assorted K-Type Probes TC- F/S


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