DEPARTMENT OF THE ARMY, MEMPHIS DISTRICT, CORPS OF ENGINEERS, 167 N MAIN ST RM B202 ATTN: CEMVM-CT, MEMPHIS TN 38103-1894

B -- REQUEST FOR MARKET SURVEY FOR NEW REPLACEMENT DIGITAL FIELD CONTROL REGULATORS FOR BOOM-HOIST AND SWING SYSTEMS ON THE 4601 MAT LOADING WHIRLEY CRANE SOL DACW66-97-B-0042 DUE 091697 POC Purchasing Agent GENO CORADINI (901) 544-3614 (Site Code DACW66) The Memphis District corps of Engineers intends to update the Boom-Hoist and Swing drive control regulators on its number 4601 barge mounted Clyde Whirley Crane. The present analog regulators are part of a diesel-generator control system designed to provide DC motor control for the crane's boom-hoist and swing motions. In addition to providing logic control and diagnostic information, the existing regulators control the DC motor and generator fields to precisely regulate DC motor speed and torque for the crane's motions. The new microprocessor digital DC motor and generator field control regulators shall be back plane mounted in the existing enclosures in place of the present regulators and interface directly with the crane's existing motors, generators, instrumentation, logic control, contactors, brakes and dynamic control circuits. The new digital control regulators will store configuration and adjustment data in EEPROM and RAM. The application software shall be an open architecture blockware programming scheme that includes blocks of code that define data flow and funtion execution. The software shall include simple blocks such as summing junctions and complex blocks such as speed regulators. Block library definitions shall be stored in ROM. The new regulators shall have built-in diagnostics for automatic selftest at powerup, including a thyristor test function, electronic circuit card selftest function and an auto-tune function. The regulators shall have the ability to generate and display diagnostic messages and have the ability to communicate status and fault messages through a LAN communication link. The regulators shall have three phase full wave reversing SCR bridges for generator field control. AC reactors shall be used in the bridge circuits to limit the rate of change of line current when the current commutates from one output leg of the bridge to another. Additionally, the field exciter output (SCR bridge) will be protected by a crowbar circuit that provides a path for field current to flow when the generator field voltage exceeds a preset limit as generator field current is reduced. A thermal sensor shall be mounted on the SCR heatsink assemblies to thermally protect the SCR bridges. To further protect the SCR bridge, special conduction state sensor cards shall be provided to monitor field current flow. Monitoring the conduction state will ensure field current in the generator can be safely reversed thus precluding SCR bridge failure. Other standard control features of the new regulators shall include a fully configurable regulator with multi-Intel microprocessor control, LAN message passing at 2.5 megabytes per second, digital inputs, adjustable current limits, programmable timed acceleration and deceleration, programmed minimum and maximum speed and fault interlocking. Additional standard protective features shall include AC line fuses, phase sequence detection, loss of phase detection, surge voltage protection, overvoltage protection, control power voltage regulation and protection and programmable instantaneous overcurrent, field loss and time overcurrent. The new regulators must be a standard "off-the-shelf" system capable of interfacing with the existing equipment and machinery. They shall also have been in use for at least five years in the industry with a proven design and reliability. Technical information may be obtained by calling Kel Shurden at 901/835-3516. If your firm is interested, you should send your letter of interest to Department of the Army, Memphis District, Corps of Engineers, 167 N. Main Street Room B-202, Memphis, Tennessee 38103-1894, ATTN: CEMVM-CT-S, no later than 15 days after date of this notice. The information contained herein is for planning purposes and does not constitute an invitation for bids nor a request for proposal. It is not to be considered as a commitment of the Government. (0241)

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