Title
Wedgewood Lift Station - Two (2) Emergency Variable Frequency Drive Replacements - Proposal
History
In late July, two of the four Cutler Hammer AF95 Variable Frequency Drives (VFD’s) at the Wedgewood Sanitary Sewer Lift Station failed. The VFD’s control the pump speed, based on the amount of sewage flow coming into the station. Staff evaluated the drives and the repairs are beyond our capabilities. Both VFD’s are no longer supported by Cutler Hammer and can only be repaired by Advanced Technology Services in Peoria, IL for a flat rate of $2,699.00 each. The Wedgewood lift station has had a series of chronic VFD failures over the past several years. Staff recommends replacing the existing VFDs instead of repairing, as they have surpassed their designed life expectancy.
Due to the emergency nature of this failure staff contacted Gasvoda & Associates, Inc., of Calumet City, Illinois (GAI) to provide a proposal to replace the existing Cutler Hammer AF95 Variable Frequency Drives. GAI is the original consultant which designed and specified the lift station pumping systems. They are very familiar with the operating parameters and recommended a new Danfoss VLT Aqua Drive at a cost of $2,769.00 per VFD. Utility Division staff is familiar with Danfoss drives having made similar conversions at other facilities. Installation and programming would be required at a cost of $4,850.00. Gasvoda & Associates is the local vendor and has the programming parameters required for installation. A proposal was received from Gasvoda & Associates of Calumet City, Illinois in the amount of $10,388.00. Contingency in the amount of $612.00 is also requested due to the challenges of retrofitting into the existing cabinet for a total cost of $11,000.00.
Do to the emergency nature and required timeliness of installation and equipment purchase lead times, this item has been ordered and is pending installation upon delivery.
On September 5, 2017, this item was reviewed by the Public W...
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