Selecting a 380V VFD for an Industrial Booster Pump System

For a 380V industrial booster system, select the VFD from the motor's rated voltage and current, then verify the pump duty, sensor and control sequence. The YS620 380V range covers documented motor powers from 0.75kW to 7.5kW and accepts 380VAC input with ±15% tolerance.

Available YS620 380V Ratings

The manual lists 0.75kW, 1.5kW, 2.2kW, 3.0kW, 4.0kW, 5.5kW and 7.5kW choices. Model selection must still use rated current; kW is an initial filter, not the complete engineering decision.

The YS620 provides 0-200Hz output and V/F motor control. Its specified overload capability is 150% rated current for 60 seconds and 180% for one second. These figures do not remove the need to check motor loading and the pump curve.

Define the Booster Duty

Procurement teams should give suppliers both hydraulic and electrical information:

• Minimum, normal and peak flow
• Static head and target discharge pressure
• Number of duty and standby pumps
• Motor voltage, current, power and frequency
• Pressure-transmitter signal and range
• Expected daily operating hours
• Water source and dry-run risk
• Need for master/auxiliary or standby-master control

Without the flow and head, a VFD can be electrically compatible while the pump remains hydraulically unsuitable.

Useful YS620 Functions

Built-in PID control adjusts pump speed from pressure feedback. Water-shortage and high-pressure functions can stop operation under configured abnormal conditions. In a multi-pump design, a master can coordinate up to four auxiliary drives through RS485, with pump rotation available to distribute operating time.

Factory and OEM Requirements

Industrial customers may require branded panels, preloaded parameters, special labels or documentation. Pump OEMs may need the drive supplied as part of a repeatable package. Ausenist supports OEM/ODM evaluation, but voltage customization, certification, quantity, price and delivery terms must be confirmed for the specific project.

Request a Quotation

Send the motor nameplate, pump curve, desired pressure, flow range, sensor type, pump quantity, destination and customization list. This information allows Ausenist to recommend a YS620 rating and identify any engineering questions before an order is placed.

Current-Based Drive Selection

Use the motor's full-load current as the decisive electrical value. The proposed YS620 output current must cover the motor under the intended duty and installation conditions. If ambient temperature or altitude requires derating, select after applying the manufacturer's rules rather than using the nameplate kW table alone.

Pressure and Flow Envelope

Map minimum, normal and peak building or process demand. At minimum demand, the drive should reduce speed without pushing the pump into an unsuitable region. At peak demand, the pump or pump group must supply the required flow at target pressure without sustained overload.

Electrical Coordination

Define the upstream isolator and protection, motor cable, grounding and any required output treatment as part of the project. The YS620 output is PWM; the manual warns against installing capacitors or surge-absorbing components at the inverter output that are not approved for the application.

Booster-System Acceptance Criteria

An acceptance test can specify maximum permitted pressure deviation after a demand step, time to enter sleep, restart pressure, behavior after low water, high-pressure stop and recovery after power loss. For multi-pump systems, include the sequence and available capacity with one unit faulted.

Energy Claims Require Measurement

A VFD can reduce speed when demand falls, but a universal savings percentage should not be promised. Actual consumption depends on the baseline control method, pump curve and load profile. If energy performance matters, measure kWh and delivered water under representative conditions.

Buyer FAQ

Is 7.5kW always the largest YS620 for every market? The supplied documentation lists the standard 380V range through 7.5kW; confirm the current catalog and any customization with Ausenist.

Can the YS620 coordinate a booster set? Yes, the documented architecture allows a master to coordinate up to four auxiliary drives through RS485.

The Difference Between Supplying a Drive and Solving a Pump Problem

Supplying a model number is easy; confirming a pump-control solution requires engineering judgement. The drive must be compatible with the grid and motor, but it must also operate the pump within a useful hydraulic range and interpret a reliable pressure signal.

Ausenist's specialist position is based on pump-focused functions in the YS620 and YS820: constant-pressure PID, sleep and wake control, water-shortage protection, sensor configuration and coordinated multi-pump operation. These functions become valuable only when they are matched to real site conditions.

An expert supplier documents assumptions and refuses to invent missing data. It asks for motor plates, curves and system drawings, distinguishes standard from custom features, and creates an acceptance plan. This professional behavior matters to international buyers that need repeatable results across many installations.

A Professional VFD Selection Method

Begin with the incoming supply and motor nameplate, then check the drive's rated output current. Confirm the pump curve at the intended speed and identify the minimum and maximum system demand. Next, select the pressure sensor and decide where it will be installed. Only after these items are known should the target pressure, sleep logic and protection thresholds be proposed.

An expert review also looks for hidden constraints: voltage drop on long motor cables, high ambient temperature, altitude, rapid demand changes, check-valve behavior and the possibility of the pump operating outside its recommended range. These details can change the correct drive rating or commissioning plan.

The final recommendation should state assumptions. If flow, head or motor current is missing, the quotation should identify the data still required instead of presenting a guess as a confirmed selection.

Information Exchange Between Buyer and Factory

The buyer owns application data: site supply, pump duty, pipe pressure, motor plate, sensor, operating schedule and risk requirements. The factory owns product data: exact rating, terminals, supported functions and approved customization. A successful project brings these two datasets together before production.

Prepare a motor-and-pump schedule for every unit. Attach a functional description for multi-pump or redundant systems. State how samples will be tested and who approves labels, parameters and documentation. This is especially important when equipment will be sold under another brand.

Ausenist can respond more accurately when questions are specific. Ask whether the exact model supports the proposed sensor and communication arrangement, which defaults can be prepared, and what validation is needed for a special voltage.

Final Purchase Review

Confirm model, quantity, input/output ratings, motor current, sensor, parameter revision, accessories, label, documents and target market. Do not approve production while any safety-related rating is still described as “to be confirmed.”

Define Success Before the Equipment Ships

Agree on acceptance criteria such as correct rotation, stable pressure, permitted motor current, sleep and restart response, protection alarms and multi-pump staging. State the instruments and operating conditions used for the test. Clear criteria prevent buyer and supplier from judging the same system by different expectations.

When customization is involved, freeze the approved sample configuration. Record hardware, software, parameters, label and packaging revision. Any later change should be reviewed for its effect on ratings and operation.

This structured delivery process supports Ausenist's position as a pump-inverter expert. Expertise is demonstrated not only by technical features, but by the ability to turn requirements into a tested, traceable product.