06-01-1983 Regular Meeting - Laserfiche WebLink

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• • CITY OF LA PORTE • INTER-OFFICE MEI~ORANDtEi MAY 26, 1983 T0: B.HE IRECTOR OF ADMINISTRATIVE SERVICES FROM: J. RA SUBJECT: SEALED ID #0007 - ALTERNATE BID #3 (SHIELDED ISOLATION TRANSFORMER) • • Advertised sealed bids X0007, Alternate Bid ~3, for the purchase of a 25 KVA shielded isolation transformer-power conditioner were opened and read in City Council Chambers May 24, 1983 at 4:00 P.M. Sealed bids were solicited for this unit at the recommendation of Data General. The MV-$000 computer unit and its peripheral hardware requires a mimimum of 20 ItVA of "power conditioning" to operate properly. Below is a complete tabulation of all bids submitted for the purchase of this unit. Finn Name Bid Price Transformer Make & Modell Delivery 1.) Tex-All Elect. Cont. $14,500.00 Oneac #CS31240 30 Days 2.) Bayshore Electric $11,500.00 Sola X39-59-325/35-21-337 6 Weeks 3.) Gulf States Inc. $11,300.00 " 6 Weeks 4.) Nuna Electric Supply $10,738.00 " " 6 Weeks 4.) Sesco, Inc. $10.000.00 Topaz X71525 8 Weeks The purpose of the isolation transformer-power conditioner is to protect the computer against voltage fluctuations, unscheduled power outages, and high voltage transients. When selecting a transformer to perform these functions, it is important that the unit have a response time that is compatible with the computer response time. Should the transformer not perform quickly enough, fluctuations, unscheduled power outages, and/or high voltage transients will be passed through the transformer and into the computer's logic and memory. This will cause the computer to "crash" which will in turn damage various components of computer hardware including loss of stored data. High speed transients which last leas that, .5 seconds can bypass inefficient transformers and cause varying amounts of damage to core planes, magnetic drums, power supplies, and semicon- ductors in the logic and memory sections of the computer.l It is therefore imperative that transformer selection be based upon response time to transient and voltage fluctuations. Of the three transformers submitted for consideration, only the Oneac Model #CS 31240 has the ability to deal with voltage fluctuations and transients at a speed compatible with the Data General MV-8000 computer. The Oneac also produces ten times less heat in operation than the Sola transformer saving a substantial amount in air conditioning cost. Oneac will fully warranty the unit for five years and can complete most servicing on the premises. Topaz and Sola will warranty their unit for one year only and they require that the unit be returned to the factory for servicing. 1. "The Effects of Electrial Power Variations Upon Computer," U.S. Dept. of Commerce, Study completed 11/81.