Engineering confidence since 1994
ENERGY SAVING FOR PROCESS PLANTS
Turn low-load running into an energy-saving opportunity.
Your motor’s workload changes. The i.MWM-IO’s built-in converter automatically changes its connection to help suitable motors use less energy when running lightly loaded.
Automatic load-based switching
Motor protection included
Power & energy monitoring
THE OPPORTUNITY
A motor may need a higher capacity to start its load or handle peak demand, then spend much of its running time at a lighter load. Those low-load periods can offer an opportunity to save energy.
Delta–Star conversion is intended for suitable variable-load applications. The motor’s actual loading, starting requirements and time spent lightly loaded determine the fit.
HOW IT WORKS
The i.MWM-IO monitors running power and controls the power contactors. When the load changes, it can change the motor’s connection after a programmed delay.
The starting arrangement is selected for the motor and its load.
The motor runs in Delta as the application requires.
The connection changes to Star to reduce energy use. Delta operation resumes as demand rises.
A simplified operating sequence. The power threshold and delays are set for the application.
Operation below around 50% of rated load is identified in the product guidance as a potential opportunity. This is a screening guide; the actual Under Power set point must suit the motor and process.
Programmable delays are 3–50 seconds before switching to Star and 3–15 seconds before returning to Delta. The built-in Star–Delta timer supports suitable starting arrangements.
Certain high-inertia loads require DOL-type starting torque and therefore cannot be started in the conventional Star-Delta configuration. In such applications, the Delta-Star Energy Saving Converter starts the motor directly in Delta configuration, allowing the motor to develop the required starting torque and accelerate the high-inertia load. Once the motor reaches the required speed and the load condition becomes suitable for energy saving, the device automatically changes the motor connection from Delta to Star.
WHAT MAKES IT DIFFERENT
A conventional Star–Delta starter changes the connection during startup. The i.MWM-IO also monitors running power and can return to Star during suitable light-load periods.
Monitors running power and switches connections as load changes, with programmed delays and no routine operator intervention.
Combines a settable Star–Delta timer with the converter, so a separate Star–Delta timer is not required.
Includes protection for overload, phase loss, voltage faults, locked rotor and other motor fault conditions.
RS-485/Modbus communication supports integration with PLC, DCS and HMI systems for monitoring and control.
Lower energy consumption during suitable low-load operation, plus improved power factor and reduced kVA demand. The product guidance also identifies cooler motor operation as a potential benefit.
Energy use (kWh), power factor and demand (kVA) are different measures. The impact on your bill depends on the measured change, running hours and your electricity tariff.
REPORTED RESULTS
The supplied case studies compare normal operation with Delta–Star energy-saving operation. Here are the reported power values and the energy savings calculated from them.
UltraTech Cement · Magdalla, Surat
Reported energy saving
24 kWh / dayAt 24 hours per day in the low-power condition.
Power factor also improved from 0.60 to 0.89. This loaded conveyor required Delta starting.
Read case study PDFOperating data · August–September 2023
Reported energy saving
4.8 kWh / dayCalculated for 20 operating hours per day.
Average power was calculated from 97 hours in normal mode and 163 hours in saving mode.
Read case study PDFOperating data · September 2021
Reported energy saving
45.08 kWh / batchCalculated for a 23-hour operating batch.
Average power was calculated from 65 hours in normal mode and 66 hours in saving mode.
Read case study PDFResults are from supplier-provided case studies for specific operating periods, using the rounded power values shown. Savings vary with motor condition, actual loading and time spent at low load. Cost savings and payback figures in the original PDFs use their stated electricity tariffs and operating assumptions.
Tell us what your motor drives. Let’s discuss whether Delta–Star conversion could be a fit.
COULD IT FIT YOUR APPLICATION?
Look for motors whose demand changes and that spend meaningful time lightly loaded. The examples in the product material span these applications.
CONVEYOR APPLICATIONS
Selected Delta Star Converter customers for conveyor-belt energy-saving applications, as reported by Advanced Microtech.
THE DETAILS
Read the operating concept, product specifications and complete application reports.
Three-phase current and voltage, power factor, active power (kW), energy consumption (kWh), operating hours, start and trip counts, and current and voltage at the last fault.
Current- and voltage-based phase loss, overload, underload, phase unbalance and reversal, locked rotor, short circuit, earth fault, overvoltage and undervoltage.
Refer to the product brochure for the full specifications and discuss the required range and starter arrangement with our team.
LET’S TALK ABOUT YOUR APPLICATION
Learn more about the Delta Star Converter and discuss where it could help in your plant.
Advanced Microtech · WhatsApp
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