What Drawings and I/O Lists Should Accompany a Pump VFD Project RFQ?

A useful pump VFD RFQ should include a motor schedule, electrical single-line diagram, control narrative, I/O list and site-condition summary. These documents prevent suppliers from pricing different scopes under similar descriptions.

If complete drawings are not ready, a structured data sheet is acceptable, but all assumptions should be listed and confirmed before the order.

What Information Is Required?

• Motor schedule with tag number, pump duty, voltage, current, power, frequency and motor type.
• Single-line diagram showing supply, protection, bypass requirements and panel boundaries.
• I/O list covering start/stop, pressure feedback, alarms, level switches and remote signals.
• Control narrative for modes, staging, sleep, alternation and fault response.
• Cable schedule or at least motor and sensor cable lengths.
• Site voltage, altitude, temperature, enclosure location and required communications.
• Quantity, project schedule and required document language.

Selection Example

An RFQ lists six 5.5 kW pump motors but provides no current, voltage or duty tags. Supplier A assumes identical motors and basic local control. Supplier B includes pressure transmitters, remote status and a standby-pump sequence. Their prices cannot be compared fairly.

After the buyer adds the motor nameplates, single-line diagram and I/O schedule, both suppliers can quote the same electrical and control scope. Final drive selection then follows rated current, supply and site conditions, while optional devices remain clearly separated.

Common Mistakes

• Sending only a pump equipment list with no motor nameplate data.
• Using “remote control required” without defining signals or protocol.
• Omitting the boundary between the VFD supplier and panel builder.
• Failing to identify optional items separately from the base scope.
• Treating preliminary drawings as approved construction information.

AUSENIST Solution

AUSENIST can review the RFQ package, mark missing inputs and prepare a model-selection and quotation basis for YS620 or YS820 engineering confirmation. The response can distinguish included functions, required external components, parameter assumptions and items that remain subject to project approval.

A quotation should remain conditional when motor data, supply details or the control sequence is incomplete. Panel certification, protective-device coordination and local code compliance remain project-specific responsibilities. Use the constant-pressure VFD specification checklist when the RFQ concerns a booster package.

Send us the motor nameplate, quantity, voltage, application and project requirements. We can prepare VFD selection and quotation.