Quanzhou Ausenist Technology Co., Ltd How to Wire Remote Start Stop Control for a Pump VFD?
Remote start-stop control for a pump VFD is normally done through digital input terminals configured for run command, stop command or forward operation. The exact wiring depends on the selected VFD model, control mode and whether the signal comes from a switch, float, relay or PLC.
Recommended Configuration
| Item | Reference Selection |
|---|---|
| Command | Digital input terminal for remote run/stop |
| Signal Source | Switch, float switch, pressure switch, relay or PLC contact |
| Speed Reference | Keypad, analog input, PID setpoint or external command |
| Safety | Emergency stop and protection circuit as required |
| Feedback | Run, fault or ready relay output if needed |
| VFD | AUSENIST pump VFD configured for terminal control |
What Must Be Confirmed?
- VFD model and terminal diagram.
- Two-wire or three-wire control requirement.
- Signal source type: dry contact, relay or powered signal.
- Whether speed comes from keypad, analog input or PID.
- Required run feedback and fault feedback.
- Emergency stop and local electrical rules.
Selection Logic
Remote start-stop is not just wiring; the VFD command source must also be set correctly. If the drive is still set to keypad command, an external switch may do nothing even when wired correctly.
Two-wire control is common for simple pumps: a maintained contact commands run, and opening it stops the pump. Three-wire control uses separate start and stop signals and is common in some panel designs.
If a float switch, pressure switch or PLC controls the pump, confirm whether it provides a dry contact or voltage signal. Incorrect signal type can damage inputs or cause unreliable operation.
Common Mistakes
- Wiring terminals correctly but leaving command source on keypad.
- Mixing powered signals with dry-contact inputs.
- Forgetting common terminal wiring.
- Using remote start without fault feedback to the control panel.
- Confusing start-stop control with speed reference.
- Bypassing safety circuits during testing.
AUSENIST Solution
AUSENIST can help review the control requirement and suggest the proper terminal-control direction for the selected pump VFD. Final wiring should follow the model manual and local electrical standards.
FAQ
Can a float switch start and stop a pump VFD?
Yes, if it is wired to the correct digital input and the VFD is configured for terminal command.
What is two-wire control?
Two-wire control uses a maintained contact. Closed means run, and open means stop.
What is three-wire control?
Three-wire control uses separate start and stop commands, often through pushbuttons or relay logic.
Can a PLC control the VFD start command?
Yes. The PLC output type must match the VFD input requirement, and run/fault feedback should be considered.
Does remote start control pump speed?
No. Start-stop command only runs or stops the pump. Speed reference is configured separately.
Why does the terminal signal not start the VFD?
Possible causes include wrong command source, missing common wiring, wrong input assignment or active fault status.
What information should I send?
Send VFD model, terminal wiring photo, control source type, desired logic and whether feedback signals are required.
Related AUSENIST Pages
Send us your control signal type, VFD model and pump operation logic. AUSENIST can help review the remote start-stop configuration.