DC2 series Dynamometer Controller full specification

Device description and supported dynamometers

DC2 series Dyno Controllers are a versatile solution designed to control multiple types of dynamometers. It’s compatible with hub, engine and chassis dynos, and it works with multiple types of dyno absorbers. DC2 series contains the following models:

DC2 – top of the range, upgraded version of DC1E4
DC2L – budget controller for simple dynamometers that don’t require all DC2 features

Main upgrades from DC1 series controllers:

More inputs, more outputs, bigger data memory, faster CPU
New high side outputs with current measurement for bidirectional DC motor control
High precision load cell inputs with built in programable amplifier that support direct load cell connection
Weather station moved to a separate enclosure and connected with a cable to the main controller

Feature	DC2L	DC2
RAM memory	4GB	8GB
Internal data memory	64GB	256GB
CAN-BUS lines	1	2
Power outputs	5V, 12V only for sensor inputs 10W total	5V, 12V, 24V for sensors and on separate connectors 20W total
Analog outputs	1	4
Low side PWM outputs	2	4
High side PWM outputs	0	4
ON / OFF low side outputs	1	4
Relay outputs	1	4
Frequency inputs	1	5
Multi sensor, engine speed frequency input	1	1
Load cell inputs	1	4
0-5V fast analog inputs	1	12
High precision 0-5V analog inputs with thermocouple support	4	8
Switch inputs	1	4
Supported dynamometer configurations	Inertial or absorption dyno Engine dyno Motorcycle dyno 2WD chassis dyno 4WD chassis dyno with mechanical synchronization	Inertial or absorption dyno (up to 4 absorption units) Engine dyno Motorcycle dyno 2WD chassis dyno 4WD chassis dyno with mechanical synchronization 4WD chassis dyno without mechanical synchronization 2WD hub dyno 4WD hub dyno

Differences between DC2 models

The controller is an all-in-one device, that combines PC type computer with operating system and dedicated software, and microcontroller system to control dyno and acquire data in real time.
Tasks performed by the controller:

Readout of dyno parameters and data logging signals from additional sensors and OBD
Generation of absorbers control signal
Control of auxiliary dyno devices such as fans etc.
Saving of all the data and later analysis
Option to extend controller capabilities with CAN-Bus connected devices.

DC2 can make use of any absorber system that can be controlled with:

Digital PWM signal
Direct PWM control with current up to 3A
0-10V analog signal
CAN bus message

General specification

Power supply	100-240 VAC, 50-60Hz, 1.5A, IEC C14 socket
Ambient temperature	−20°C – 50°C
Ambient humidity	0%-95% non condensing
Base computer	4-core Cortex A76 2.4GHz 4/8GB RAM LPDDR4 Data memory 64/256GB 100MB/s
Microcontroller	32-bit RISC 64MHz

Inputs / outputs

Wi-Fi IEEE 802.11b/g/n/ac (2,4/5 GHz)
Bluetooth 5.0 (Low Energy (BLE))
Gigabit Ethernet
2 x USB 2.0
2 x USB 3.0
2 x micro HDMI
Ambient condition sensor / weather station (temperature, pressure, humidity) included as a separate device
CAN-BUS 2.0B
Power outputs 24V, 12V, 5V
Analog outputs 0-10V
Low side PWM outputs 3A 40V
High side PWM outputs 3A 28V with current measurement
Additional ON/OFF low side outputs 3A 40V
Two-terminal relay outputs 250V 16A
Frequency inputs for axle speed or other sensors with frequency signal up to 10Mhz
Engine speed input for hall, VR, inductive or capacitive clamp sensors up to 15kHz
Dedicated load cell inputs with integrated programmable amplifier
Fast, general purpose analog inputs 0-5V
High-precision analog inputs 0-5V for thermocouples or other analog signals
2-pin switch inputs

PC typical interfaces

The controller is equipped with typical interfaces, found in PC type computers, such as USB, Ethernet, micro HDMI. These allow to connect standard input / output devices such as mouse, keyboard, printer, display and internet connection. Wireless interfaces such as Wi-Fi and Bluetooth are also available.
Bluetooth enables wireless connection with vehicle OBD system, for readout of engine parameters, with use of optional interface.

Ambient sensor and power correction

The weather station shipped with the controller has a precise Bosch ambient sensor that is used to measure temperature, pressure and humidity which can be used to calculate engine power correction. Available correction standards are:

DIN 70020
EC 95-1
ISO 1585
JIS D1001
SAE J1349

Sensor specification:

Humidity: 0% ÷ 100% ±3%
Pressure: 300 ÷ 1100hPa ±1.7hPa
Temperature: -40 ÷ 85°C ±1.25°C

All power correction parameters can also by sourced from any data channel available in the controller. For example:

external sensor connected to analog input
OBD
CAN bus

CAN-Bus interface

The controller is equipped with CAN-Bus 2.0B interfaces, with transmission speed up to 1Mbps, compatible with ISO-11898-2 and ISO-11898-5.
Interfaces are equipped with software controlled 120Ohm terminating resistor.
CAN-Bus is routed with one twisted pair of wires and allows connecting many devices in parallel on one bus.
The interface is NOT isolated. The device you are connecting must be on to the same ground reference as the dyno controller, or the driver will be damaged. The maximum allowed DC voltage on CAN HIGH and CAN LOW terminals is -58V to +58V
Example devices that can connected to the controller via CAN-Bus:

Additional actuator drivers, H-bridges for servo motor control
Additional input extenders – wideband oxygen sensor controller, extra analog inputs
Automotive displays such as Ecumaster ADU
Engine control units such as Ecumaster EMU Black, which can be used to read engine operation parameters or to control throttle opening

Power supply outputs

DC2:

3 separate power supply outputs: 24V, 12V, 5V (2A), capable of total 20W power

DC2L:

12V and 5V is supplied only to sensor connectors with total 10W power.
12V power: 9W
5V power: 1W

Low power external modules can be connected to the supply.
The supply can be used to power external relays and control them with low or high side outputs.

Analog outputs

Analog outputs with 0-10V range are intended to control auxiliary dyno devices requiring analog signal.
Can be used to control dyno absorber in retrofit applications.
Output impedance: 1kOhm
Resolution: 12bit

Low side, high side and relay outputs

The controller is equipped with low side outputs, capable of connecting terminal to ground and high side outputs to supply voltage.

Maximum switched voltage low side: 40V
Maximum switched voltage high side: 28V
Maximum current: 3A continuous, 12A peak
Maximum inductive load switching energy: 50mJ
Short circuit and overload protected
Short circuit and overload protected

Part of the outputs have hardware PWM generation functionality and can generate PWM signal with frequency from 0.06Hz to 50kHz and resolution of 20bit. PWM outputs are capable of controlling:

eddy current brakes (with use of external BD1 brake power supply)
solenoid valves
servo motors compatible with RC pulse signal
power modulation of devices such as cooling fans etc.

Low side and high side outputs can be joined into half or full bridge to enable bidirectional control of DC motors.

High side outputs have current measurement functionality.

Remaining low side outputs and relay outputs are controlled with programmable logic and allow to power auxiliary devices according to operating conditions or user input. Example use cases are:

automatic fan turn on above preset engine speed
starter motor control from dyno keyboard

Relay output capacity is 250V 16A for resistive load. Switching high inductive load may require an external arc suppression circuit.

Frequency inputs

Inputs specification

Maximum input signal voltage: 15V
Signal threshold voltage: 2.5V
Hysteresis: 0.6 – 1.2V
Pulse capture mode frequency range: 15mHz – 15kHz
Pulse capture mode resolution: 31.25ns
Pulse capture mode accuracy: 0.003%
Pulse capture mode precision @ 1kHz: 0.0032%
Pulse capture mode precision @ 15kHz: 0.045%
Pulse count mode frequency range: 10kHz – 10Mhz
Pulse count mode sampling frequency: 1000Hz
Pulse count mode accuracy: 0.003%
Pulse count mode precision = Sampling frequency / Input frequency
Pulse count mode precision @1MHz: 0.1%

The engine input allows reading signal from Hall, VR, inductive or capacitive clamp sensors. It can be used to read engine speed in cases where the speed is not in constant relation with dyno roller or shaft speed.

Input voltage up to 50VAC sine, 250V peak
Differential input
Adaptive signal arming threshold from 23Hz up
Pulse capture mode frequency range: 15mHz – 15kHz
Pulse capture mode resolution: 31.25ns

Load cell inputs

The controller has dedicated, differential high precision inputs with built-in programmable amplifier for direct connection of load cells.

Amplification range: 1 – 128
Differential voltage range: 4V
Voltage on inputs for measurement: 0.5V – 4.5V
Allowable voltage on inputs: 0V – 5V
Resolution: 24bit
Logging frequency: 500Hz
Sampling frequency: 256kHz
Measurement accuracy: 0.06% @ 0°C ÷ 40°C
Measurement precision: 0.04% @ 0°C ÷ 40°C

Analog inputs

The device has analog inputs with 0-5V range that can be used to connect any additional sensor.

Maximum input voltage: 30V
Measurement range: 0-5V
Resolution: 14bit (1mV)
Logging frequency: 500Hz
Sampling frequency: 25kHz
Measurement accuracy: 1% @ 0°C ÷ 40°C
Measurement precision: 0.3% @ 0°C ÷ 40°C

High-precision analog inputs

The device has differential pairs of high precision analog inputs. These inputs can be used for direct thermocouple connection or for connection of any sensor giving signal in 0-5V range. Every pair allows measuring one signal in differential or two signals single-ended mode.

	DC2L	DC2
Maximum differential signals	2	4
Maximum single ended signals	4	8

Resolution: 16bit (3.9μV – 94μV)
Logging frequency: 10Hz
Sampling frequency: 250kHz
Voltage ranges: 0-256mV to 0-5V
Measurement accuracy: 0.16% @ 0°C ÷ 40°C
Measurement precision: 0.1% @ 0°C ÷ 40°C

K-Type thermocouple connection:
Differential (above and below ambient temperature measurement):
alumel (-) to S2
chromel (+) to S1

Single ended (only above ambient temperature measurement):
alumel (-) to –
chromel (+) to S1 or to S2 for second sensor

Switch inputs

The device has inputs for switch connection. A switch can be used to activate software functions or controller outputs.

Safety precautions

The device should be fixed on a hard, flat surface in a well-ventilated area.
The device must not be exposed to vibration.
The device air flow must not be obstructed.
No foreign objects should be inserted into the device.
Life-threatening, high voltages are present in the device. Make sure that it is disconnected from mains power supply before doing maintenance work.
The device is intended for installation by qualified personnel.
The device should be protected from access by unauthorized personnel.
The device should be protected from moisture. It mustn’t be used when wet.
The device mustn’t be powered without the enclosure assembled.
The device installation doesn’t require enclosure disassembly.
If the device is not working correctly, makes disturbing noises, emits burning smell, it should be immediately powered down. Please contact the manufacturer for repair.
The device power supply must be protected with 2Amp circuit breaker.

Technical drawings and pinout DC2

Technical drawings DC2L

Warranty

The producer guarantees that the device is manufactured according to accepted craftsmanship practices, and it meets the applicable standards. Correct device operation is guaranteed for 24-month period starting from date of purchase.

The guarantee does not cover damages caused by improper installation, usage or non-compliance with the instruction manual.

The device is intended for installation by qualified personnel. Device final performance and suitability for a particular application is dependent on the user, and thus it is not guaranteed by the manufacturer.

These specifications are subject to change without notice.