John
Are you saying there is no 0 to 10volts coming out of the isolation board which is attached to the end of the lenze controller ?
If so disconnect the isolation board to the lenze controller and connect your test potentiometer directly to the lenze controller
The spec for the lenze controller is on line a google search finds its instantly
For testing purposes you can use a 3 volt cell to feed an input into the lenze
Also note that there is a pair of terminals which must be bridged together to allow the lenze to work
I used these to connect to the relay on my BoB to turn the spindle on/off and then the voltage from the battery will set a speed or alternative to the battery is the potentiometer
Just be careful as the terminals for the potentiometer are floating at around 110volts at speeds zero to 120 volts at full speed
This is the purpose of the isolation board to but a isolated ‘bridge’ between the BOB and the lenses controllers high voltage

On my boxford vmc190 the lenze was perfect but the isolation board was toast
I used a diycnc.com board to provide the isolation between the lenze and the BoB

Paul


Sent from my iPhone using Tapatalk