Industrial Engineer · phase 8 of 16
Control Terminals
Low-voltage terminals for digital inputs, analog signals, references, relays, and auxiliary power.
The Explain card
- Plain English
- The control terminals are the low voltage strip where digital inputs, analog references, relay outputs and the 24 volt supply land. They are how a panel tells the drive what to do without a network.
- Example
- Terminal one gets the run command from a PLC output, terminal five gets a 0 to 10 volt speed reference, and a relay contact on the strip reports a fault back.
- Why it matters
- Every terminal has a function assigned by a parameter, so the same wire on two drive brands does different things. Check what the terminal is configured for before you trust the drawing, and keep control wiring away from the motor leads or the reference will wander.
- Hook
- The drive's own I/O card.
Where it sits in the deck
Phase 8: VFD Drive Hardware and Power Path
Inside the drive: rectifier, DC bus and inverter, the three stages every variable frequency drive uses to rebuild the waveform a motor sees.
