Mike Dolt Enterprises
Mike Dolt Enterprises
User: greeder88, Location: San Francisco Bay Area, CA, USA
Asked on: Wednesday, April 6, 2011 at 7:49 am EDT
Answered on: Tuesday, May 14, 2024 at 3:50 am EDT
Question: I have a cnc milling machine spindle with not enough HP at low speeds. I have a 5hp ac motor and a Mitsubishi FR-V220E Vector inverter with encoder and index card installed. Due to cost I can't buy a bigger motor and inverter.I will mechanically add (In the timing belt loop) my spare motor and inverter to get 10hp. I don't have a spare index card for the second inverter (Used to align the spindle at stop for tool changer). I do have a motor, inverter, and encoder kept as spare parts.Searching on the internet I see that this can be done by feeding analog out to analog in. My problem is how exactly to wire this. I am sure it is not just run wires across to the second motor and I'm done.Any help on how to wire would be appreciated.Here is a link to the inverter manual:http://suport.siriustrading.ro/02.D...Instruction Manual IB(NA)-66658-D (07.98).PDFThanks,George
Disclaimer
Modifying or connecting electrical equipment improperly can be dangerous and may void warranties. It is highly recommended to consult with an electrician or qualified technician for assistance.
Wiring Instructions
To connect two inverters for increased torque at low speeds, follow these steps:
Inverter Settings
1. Set the master inverter (FR-V220E with encoder and index card) to "Master Run Mode."2. Set the slave inverter (spare inverter with motor and encoder) to "Slave Run Mode."
Wiring
Digital Communication
1. Connect the digital output (DO) terminal of the master inverter to the digital input (DI) terminal of the slave inverter.
2. Use a shielded twisted-pair cable for this connection.
Analog Communication
1. Connect the analog output (AO) terminal of the master inverter to the analog input (AI) terminal of the slave inverter.
2. Use a shielded twisted-pair cable for this connection.
Power Wiring
1. Connect the power supply to both inverters.
2. Connect the output terminals of the master inverter to the input terminals of the slave inverter.3. Use appropriate cables sized for the motor power and inverter output.
Grounding
1. Ensure that both inverters and motors are properly grounded.
Encoder Wiring
1. Connect the output terminals of the master inverter's encoder to the input terminals of the slave inverter's encoder.
2. Use a shielded twisted-pair cable for this connection.
Additional Notes
You may need to adjust the analog gain and offset settings on the slave inverter to ensure proper control. The master inverter will provide the reference speed and torque command to the slave inverter. The index card on the master inverter will still be used for spindle alignment. Make sure that the power ratings of both inverters and motors are compatible. Consult the inverter manuals for specific wiring diagrams and additional configuration details.
Safety Precautions: Always disconnect power before making any connections. Verify that all wiring is secure and meets electrical codes. Avoid touching live electrical components.* If you are not comfortable with electrical connections, it is best to seek professional assistance. Flag for review