Master Line Speed Command

Follower (Slave) Speed Percent

  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 equal (100%) of the master's speed.

This system uses a typical speed potentiometer as a "voltage divider" which applies a signal voltage to the master drive, over the complete range of the signal input. For example, 0 to 10VDC is the auto-reference input for the drive. The follower potentiometer, further divides the master input reference voltage. Note that this circuit limits the performance of the follower drive. The follower input speed reference will only equal or be less than, the master speed reference.

• Using two speed "pots" is simple.

• Troubleshooting two speed pots requires a volt-ohmeter only.

• Signal isolation may be required, depending on the source of the auto-reference.

• Follower speed reference input can never exceed the master reference signal level.

• Voltage reference can droop over long distances. This requires higher signal source voltage, and trim pots.

• 2 potentiometers

• 1 or 2 operator station enclosures for mounting the pots in

• 2 vsd's

• 2 motors

Easy

Difficult