ABB REX 521 Technical Reference Manual, General

Also see for REX 521: Operator's manual Technical Reference Manual, General Operating guide Technical Reference Manual, Standard Configurations Technical Reference Manual, Standard Configurations

Contents

ABB REX 521 Technical Reference Manual, General Manual pdf 10 page image

101MRS 751108-MUMProtection RelayTechnical Reference Manual, GeneralREX 5214.1.1.3. Relay Setting Tool viewTo improve usability, a REX 521 specific pull-down menu, View, with three viewshas been created to the Relay Setting Tool.Avt# " SryhTrvtUyvrThe Settings view includes the parameters for setting of all the function blocks. TheConfiguration view includes signalling and hardware related settings. Theparameters in the Configuration view are advised to be set during commissioningand service because some of the parameters cause resetting of the device. Pleaserefer to “Appendix C: Parameters which cause reset” on page 58 for a list of theseparameters. Measured values and registered data, e.g. current, digital input states,can be uploaded by means of the Measurements & Registered Data view.4.1.2. Non-volatile memoryThe protection relay is equipped with a non-volatile memory for preservingimportant data during auxiliary supply breaks. For example, when a setting value ischanged, the new value is stored in the memory at the moment of sending it to therelay, without additional store commands. The memory does not need batteries, anda lifelong service is guaranteed.Following data is stored in the non-volatile memory:• Setting values• Display state• Lockout state• Recorded values 1• Last 50 eventsWhen the relay is restarted, the same LED indication and text as before the auxiliarysupply break are restored on the display.1. Because the storing of the recorded values is a background task, it might be affectedby a sudden auxiliary power failure.