Page 4–2 Stellar
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SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Chapter 4: Principles of iERS (intelligent Energy Recovery System)
pRINcIples of The IeRs
enabling inTelligenT energy reCovery sysTem (iers)
iERS can produce energy savings in suitable applications. However, the user should have an
understanding of the application and load characteristics before enabling the feature.
Loads which exhibit frequent changes in motor torque may cause the SR55 soft starter to
switch rapidly between the iERS ‘on’ state and the ‘bypassed’ state as the motor torque
changes. If left unchecked, such switching may cause premature wear of the internal bypass
components, and may invalidate the warranty.
If the loaded/unloaded state changes more than 4 times per minute, iERS should not be enabled.
Applications that are typically well suited to the iERS feature include: Artificial Lift Pump
Jacks, Injection Molding Machines, Mixers, Saws, Rolling Mills, Grinders, Hydraulic Pumps,
Crushers, Conveyors, Compressors and Vertical Transport applications.
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