Hub dynamometer wiring and setup

Sensors wiring

Left / right wheel speed sensor – Frequency input 1 / 2
Brake torque sensor – according to the drawing – Load cell input 1, 3
When there is no constant speed ratio between dyno shaft and engine shaft and engine torque calculation is required, optional engine speed sensor can be connected to the Engine speed input.

Actuators wiring

Signal, used to control the brake on the dyno shaft, which speed is measured by Frequency input 1 is generated on Low side PWM 1 output. It is Low Side / Open Collector output with pull-up resistor to +12V. Low side PWM 2 is similarly related to Frequency input 2.

BD1 brake power supply connection

DC1 Dyno Controller terminalBD1 Brake power supply terminal
Load cell input n / –GND
Low side PWM n / SCTRL INV
Not connectedCTRL
Load cell input n / SLCOUT

Software setup

Frequency input 1(2) / Signals per rotation – signal count per rotation of left (right) brake.
Frequency input 1(2) / Inertia – rotational inertia of left (right) brake with all associated rotating elements. For precise measurement, inertia value entered here should include typical inertia of rotating drivetrain components.
Frequency input 3 / Inertia should be set to 0
Load cell 1,3 / coefficient a,b – load cell calibration coefficients should be set with Wizard tool.
For unused inputs 2 and 3, both coefficients must be set to 0.
General/Dyno type – “2WD hub” option

PWM output setup

Dynamometer absorber PID setup and tuning