ABB Addendum to IB 7.11.1.7-7 Issue B

Type GPU-2000R Generator Protection System for Units of Catalog Series 589 R-----------------------------------------------------------------------------------------------------------

Purpose and Cautionary Note:It has been determined that there is an error in the firmware of the 589R Series GPU2000Runit, related to the operation of the AND logic function available for the Programmable Outputs.(in Firmware versions 1.60 and below)

The error in the firmware results in the AND logic operating as though the setting was forOR logic. Therefore, a closure of a physical output contact will be obtained on the assertion ofonly one logical output function, when it was desired to have the output only on the coincidenceof two or more logical functions.

References in the Main Instruction Book:See page 38 in Issue B of the main instruction book, IB 7.11.1.7-7. The pc screen that is usedto program the output logic is shown. The screen indicates that all outputs are set for ORlogic. The alternate choice of AND logic must not be used due to the firmwareerror.

Commentary:It has been observed that the use of this AND logic function by customers is quite rare in theactual application of the 589R series units. Therefore, prior to the availability of updatedfirmware, the following "workaround" method is suggested and has been used for fieldexpediency.

WorkaroundIf the application requires the logical AND of two or more logical output functions, theworkaround is to program each function to a separate output contact, and then physically wirethose output contacts in series. Thus to obtain a continuous path through the outputs, all mustbe individually asserted, giving the desired AND logic.

Customer SupportQuestions on this addendum can be directed to our customer support group at telephone 800-634-6005, or 610-395-7333, or e-mail to: powerful.ideas@us.abb.com.

ABB Inc.Substation Automation and Protection Division7036 Snowdrift Rd.Allentown, PA 18106 USA Rev 0: Feb 2002