Servo Pump Retrofit ROI Calculator
When you replace the old asynchronous pump motor in your hydraulic injection or press machine with an Estun servo drive + HPB PM Servo motor (Retrofit); you reduce waste by 95% during idle times, cut hydraulic oil cooling costs, and increase machine speed.
See the savings and return on investment (ROI) time online, send us the results, and request a solution for your project.
Why Convert to a Servo Pump?
The longer the idle, cooling, and part-removal times in the machine cycle, the more massive the energy savings as the servo pump stops during those moments.
Constantly recirculating hot oil shortens its lifespan, and the chiller works furiously to cool it. Since the servo system doesn't heat the oil, chiller savings stay in your pocket.
Closed-loop driven high-torque PM Servo motors adjust hydraulic pressure in milliseconds, increasing your production speed and product weight precision.
Main Parameters
Your Cycle Profile
Power Draw Characteristics
Old Asynchronous System
Star/Delta or Direct-on-lineNew Servo Pump System
Estun / HPBFinancial Parameters
Annual Motor Energy Cost
Electricity Bill OnlyBreakdown of Total Annual Gain
BreakdownEnergy Analysis
ModelPayback & Investment Analysis
ROIEngineering Expert Insight
The Secret to Gain is "Idle" Time: The longer the mold cooling or part removal time, the longer the servo system goes into "sleep (stand-by)". While the motor turns idly in the old system during this time, the servo system's energy draw drops to 5%, creating the massive gain.
The Hidden Profit: Chiller (Cooling) Unused oil in traditional hydraulics is bypassed through a proportional valve back to the tank. Oil passing through this bottleneck heats up, and the chiller works constantly to cool it. Because the servo system only pumps as much oil as needed, the oil doesn't heat up. This means an extra 10-20% hidden gain not seen on the electricity bill.
Frequently Asked Questions
Is the power (kW) of the new servo motor chosen to be the same as the old motor?
Usually not. Since servo motors can operate at up to 300% momentary overload (peak), the machine's maximum pressure requirement is met with peak torque, allowing the motor power to be sized one or two sizes smaller. This reduces hardware costs.
Do I have to change the pump as well?
If your current pump is a fixed displacement internal gear pump, it can usually be connected directly to the servo motor (with coupling and flange matching). However, variable displacement pumps generally need to be replaced with fixed displacement pumps because the servo already alters the flow itself via speed.
Does the retrofit (modernization) process make the machine panel much larger?
On the contrary. Because the old star-delta contactors are removed, serious space is freed up inside the panel. However, the panel's ventilation/AC needs must be re-checked against the heat emitted by the servo drive and (if present) the braking resistor.
Why is the payback (amortization) period calculated at under 10 months?
Especially in thick-walled (long cooling time) injection processes, idle time is over 50%. In industrial zones where the electricity unit price is high (especially in 3-shift production), the investment literally pays for itself within months.
ONX Technical Summary
Live Financial Analysis
ONX Insight
Calculated ROI payback periods may show slight variations based on the mechanical losses of your machine and changes in the local electricity unit tariff.