Variable Speed Drive Signal Output as follower reference for Another Drive. Master Follower Motor Control System. Master Slave Motor Control System. Master Slave Motor Tutorial

Burhans Research Motor Control Systems
Master Line Speed Command	Follower (Slave) Speed Percent

Directions:

Enter a master speed command in percent, as whole numbers. Maximum speed is 100%.

Click "Master Line Speed" to enter the command.

Enter a follower speed command in percent, as whole numbers.

Click "Follower Speed Ratio" to enter the command.

The follower in this example, can go from 1% of the master's speed, to 2 times (200%) of the master's speed.

System Basics

This system uses a typical signal output from the master drive, as a speed reference input, to a follower drive. There is no speed sensing feedback to the drives. The drive speed regulation is "open loop".

Benefits of this system

Easy to set up a follower drive, providing it has a suitable input capability
Scaling the speed commands of each drive is on board the individual drives.

Drawbacks and Pitfalls of this system

When coordinated control is NOT desired, switching to independent control can be complex.
Scaling of each drive speed can require running product for a considerable time.
The programming of the drives on startup can be complicated.
Troubleshooting speed control of each drive can be difficult.
Open loop speed regulation may not be adequate.

Basic Bill of Materials for the system shown (excluding power transmission, etc.)

2 vsd's
2 motors

	Easy				Difficult
	1	2	3	4	5
Set up Complexity		X
Troubleshoot Complexity			X
System Operation Flexibility				X