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Overview: -
A Variable frequency drive or inverter works by modifying the frequency of AC motors.  You can control many of these with an external analogue signal (0-10V DC). If this board (B1-VSC-V1) outputs 5v the motor will run at 50% of the full speed, if it outputs 10v the motor will run at 100% of full speed. If there is no input signal the analogue output will go to 0v and the motor will stop.
Features: -
- A step input is converted in to a 0-10V analogue output.
Opto-isolated step input signal.
An input frequency from 0-25 KHz with a Minimum on-state pulse width of 3uS (5uS is recommended) will deliver an analogue 0-10V output for controlling a VFD (variable frequency drive).
- An on board Isolated supply. This board can share a grounded power
 supply even on VFD’s (Variable Frequency Drives), DCMSC (DC Motor speed controllers) or inverters that have a 0-10V input signal at mains potential (e.g. non isolated input signal).
- A precision potentiometer for fine-tuning the output voltage.
- This board can replace a potentiometer used to control the speed of a motor driven by a VFD.
Pleasehave a look at this products data sheet. 
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