Quanzhou Ausenist Technology Co., Ltd 30kW 400V VFD for a Chilled Water Primary Pump
Engineering reference image; final equipment arrangement must follow the approved design.
A 30kW chilled-water pump requires a 400V three-phase VFD whose output current covers the motor current under continuous HVAC duty. The control method must match the plant design: primary-only variable flow, constant primary flow and primary-secondary systems do not use the same speed-control logic.
Recommended Configuration
| Item | Reference Selection |
|---|---|
| Motor | 30kW, 400V three-phase, 50Hz |
| Pump | Horizontal centrifugal chilled-water pump |
| Control | BMS command or differential-pressure PID |
| Minimum limit | Based on chiller and pump minimum-flow requirements |
| Communication | Hardwired signals or confirmed Modbus RTU |
| VFD | AUSENIST project-specific 400V drive, selected by current |
What Must Be Confirmed?
- Motor full-load current and pump/system curves.
- Chiller minimum and design water flow.
- Sensor location and differential-pressure setpoint strategy.
- Number of chillers and pumps and their staging sequence.
- Plant-room temperature, cabinet cooling and motor-cable length.
Selection Logic
Start with motor current, then check continuous duty and enclosure derating. The BMS should have defined ownership of start, speed/setpoint and fault reset. Minimum frequency must protect the chiller and pump, not merely keep the VFD running. Verify valve authority and sensor placement before PID tuning.
Common Mistakes
- Copying secondary-pump control logic into a primary pump system.
- Reducing flow below the chiller limit.
- Locating the pressure sensor too close to the pump discharge.
- Assuming every 30kW drive belongs to the YS620 or YS820 standard range.
AUSENIST Solution
AUSENIST can supply a project-specific pump drive, interface plan and initial motor/control parameters after reviewing the complete HVAC sequence. The final series and enclosure must be confirmed rather than inferred from smaller standard pump-mounted models.
FAQ
Should the VFD maintain pressure or flow?
That depends on the chilled-water architecture and chiller requirements.
Can the BMS control the VFD by Modbus?
Yes when the selected version and register map are confirmed and communication-loss behavior is defined.
Is energy saving guaranteed?
No fixed percentage is valid without baseline power, load profile and measured operating hours.
Related AUSENIST Pages
Send us the motor nameplate, pump curve, chilled-water schematic and control sequence. We can prepare the VFD selection and interface requirements.