Leadfoot
Member
Take two motors and couple them end to end. Provide the variable voltage to the input of one drive and run that drive at the input voltages you need. Run the other motor in regen. You probably will need the dynamic braking module and some large wattage resistors. Most dynamic braking resistors are for 10% duty and you will be closer to 100% duty.
YES your VFD will allow the one motor to run in regeneration. YOu have to start the drive so it provides the motor with the magnetizing currents. Then spin it backwards. The transistors do not do the work but the flyback diodes around them actually pass the energy to the bus caps. You can actually program the regen torque limits on the drives. Of course you will need to read the programming manual.
You can increase the load on the driving motor by trying to make the load motor try and turn it backwards.
Or you can get a DC regen drive and motor to act as your load and regen to the line. Another way to load a VFD is to have the AC motor run a DC motor as a generator. COnnect the armature to a large resistor bank and control the field to make the "DC generator" load the VFD and Motor to the desired load.
Your sales type that agreed to the testing needs to be instructed to have engineering proof these types of contracts prior to agreeing them.. IMO, The sales type needs to lose their commission for causing an unncessary cost.
YES your VFD will allow the one motor to run in regeneration. YOu have to start the drive so it provides the motor with the magnetizing currents. Then spin it backwards. The transistors do not do the work but the flyback diodes around them actually pass the energy to the bus caps. You can actually program the regen torque limits on the drives. Of course you will need to read the programming manual.
You can increase the load on the driving motor by trying to make the load motor try and turn it backwards.
Or you can get a DC regen drive and motor to act as your load and regen to the line. Another way to load a VFD is to have the AC motor run a DC motor as a generator. COnnect the armature to a large resistor bank and control the field to make the "DC generator" load the VFD and Motor to the desired load.
Your sales type that agreed to the testing needs to be instructed to have engineering proof these types of contracts prior to agreeing them.. IMO, The sales type needs to lose their commission for causing an unncessary cost.