Hi, in this short video I will show you how to use the basic functions of the four quadrant
dynamometer-power supply. After turning it on, you will need to select
either the Dynamometer mode or the power supply mode.
I will start with the Dynamometer mode. The function button allows you to cycle through
the various functions. There is a start and stop button and a command knob
which is multi turn for more precision.
On the display, I see for the moment that my function is it a 2 quadrant constant torque break.
The torque is now blinking. When the Dynamo meter is stopped,
the value I am controlling his blinking and when I press start, it stops
blinking and shows the measured torque which might be slightly different from the desired value.
For example here I connected a motor, and
I see that it slows down when I increase the breaking torque.
I'll press stop and move to the next function, which is the prime mover mode.
This is typically used to study generators. CW means clockwise. I am now controlling the speed.
Let's set the speed to an arbitrary number, for example, 1000 RPM.
When I press start, I see that the actual speed is a little below a thousand RPM because
the load slows it down. Like on a real prime mover, the higher the mechanical load,
the lower the speed, unless you compensate.
There are other functions, which are:
- a counterclockwise prime mover and brake,
- a clockwise constant speed prime mover and brake,
- Counterclockwise constant speed prime mover and brake,
- a positive constant torque prime mover and brake,
- and a negative constant torque prime mover and break.
If you press function once more, you go back
to the first function as we cycled through all of them.
So, in short, select the function, adjust the command which is the quantity you want,
and press start.
Let's now see the power supply modes.
You can use either the Dynamometer mode or the power supply mode, but not both at
the same time. On the output, I see that it is always referenced to the electrical neutral.
There is a positive voltage source up to a hundred and fifty volts, a negative voltage
source, and a positive or negative DC current source of up to five amps.
Please note that in any of those functions the power supply can both source power and
sink power, which is very useful to study the behavior of batteries or some power electronics topologies.
You also have: a 50 Hertz power source and
a 60 Hertz power source. In both cases you can control the voltage up to 105 volts.
There is a 200V DC bus, and also a lead-acid battery float charger.
Many additional functions are optionally available for this unit, including computer control
through a USB connection and a very user-friendly free software.
Thank you for watching this video for any additional information, please send us
an e-mail at services@labvolt.com .com.
There are also individual videos for each function available on YouTube