50 CONS/LGCV, 66 Falcon Parkway Ste 49, Falcon AFB, CO 80912-6649

Z -- REPLACE AND CALIBRATE CENTRAL PLANT COMPUTER SYSTEM (CPCS) POWER TRANSDUCER SOL FA2550-96-QY098 DUE 110296. Contact TSgt Mercer T. Hurst, Contract Specialist (719) 567-3827 or SSgt Anthony D Wilson, Contract Specialist (719) 567-3839. The 50th Space Wing is seeking qualified contractors to provide all labor, materials, tools, and equipment necessary to complete the following work summarized: Test calibrate and repair or replace all watt transducers in the Central Power Plant Control System. This service is to include scaling to facilitate ``Load Shredding'' in the existing PLC control system. Contractor must know the existing computer program extremely well and have his own copy. The system in place for controlling the Central Plant is comprised primarily of Reliance Electric Automate equipment. The system includes full redundant I/O, both Analog and Digital. The system controls the emergency power for the base and also facilitates ``Load Shredding'' in the event of a lose of power. The code was written by Daniel Control Systems using Reliance Electric ladder logic. The system determines correct engine sequences. Communication between the Automate 15's and the Automate 40 Redundancy system is digital. In the event of a loss of primary utility power, seven Stewart and Stevenson diesel generators are brought on line. If the first generator fails to start, the next generator selected will start. This is determined by operator input using Binary Coded Decimal thumbwheel switches. This sequence is also displayed Digitally. The Operator Interface to the system is comprised of a Xycom Industrial Computer running the Interact Panel Tool Kit, Graphics Monitoring Module, and Alarm Management Module. A redundant ``Run Time'' system is running simultaneously on a base supplied desk top personal computer. Paladin watt transducers are implemented at each breaker. These transducers measure load at each of the breakers and send a 4-20 ma signal to the redundant Analog Inputs. The redundant I/O remains idle until a Fault Coil is energized in the appropriate ERMINE block in the program. Three redundant networks are in place in the system. First, R-NET to facilitate communications with the Operator Interfaces. Second, REMOTE I/O to handle the Digital and Analog Redundant Input and Outputs. Third, the Reliance Electric Redundancy Network controls the ``Bumpless Transfer'' of information from processor in the event of a primary rack failure. The I/O is structured so that all Inputs are read into the CPU in parallel. In other words, if one hardware input fails, the other one will energize. MOVE blocks are implemented to detect such an input failure. CPU power is delivered to the system using DC and AC inverters with the base UPS delivering primary DC power to them. The programming mechanisms in place are the Reliance Electric APS, APX and UP/DOC software packages. All generator controls are handled synchronously through the Automate 15 control systems. In effect, there are eight different control systems operating in the system. Performance period is 15 Nov 96 to 30 Sep 97. All responsible sources may submit a quotation which shall be considered by the agency. (295)

Loren Data Corp. http://www.ld.com (SYN# 0084 19961024\Z-0002.SOL)