CHAPTER 4: SETPOINTS INPUTS889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–99MAX VALUERange: -500000 to 500000 units in steps of 1 unitDefault: 0For the MAXIMUM VALUE setpoint, enter the value which corresponds to the maximumoutput value of the transducer. For example, if a temperature transducer which outputs4 to 20 mA for temperatures 0 to 250°C is connected to the analog input, then enter“250” for the MAXIMUM VALUE. The relay then interprets 20 mA as representing 250°C.Intermediate values between the minimum and maximum are scaled linearly.TRIP FUNCTIONRange: Disabled, Trip, ConfigurableDefault: DisabledSelecting the Trip or Configurable setting enables the Trip function of the analog input. IfDisabled is selected, the main function still remains enabled and reads the meter value.TRIP TYPERange: Over, UnderDefault: OverThis setting determines if pickup occurs when the analog input is over or under theprogrammed threshold.TRIP PICKUPRange: -500000 to 500000 units in steps of 1 unitDefault: 20This setpoint provides the trip pickup level in the engineering units defined in the setting.TRIP DROPOUT RATIORange: 2 to 20 in steps of 1%Default: 5%This setting represents the variation of pickup value, in percentage of pickup, at whichthe element will effectively drop out. The drop out ratio is defined as follows:• Drop Out = pickup – pickup * dropout ratio /100, when TRIP TYPE is Over• Drop Out = pickup + pickup * dropout ratio /100, when TRIP TYPE is UnderFor example, if the pickup level is 5000 μA, TRIP TYPE is set to “Over” and DROPOUTRATIO set to “10%”, the actual dropout will be 4500 μA. Conversely, if the TRIP TYPE is“Under” with the same dropout ratio, the actual dropout will be 5500 μA.TRIP PICKUP DELAYRange: 0 to 600 s in steps of 1 sDefault: 2This setpoint will operate if the trip pickup condition is maintained for a longer time thanthe delay time set here.TRIP DROPOUT DELAYRange: 0 to 600 s in steps of 1 sDefault: 0This setpoint selects a fixed time interval to delay dropping out the output signal afterbeing generated.TRIP OUTPUT RELAY XFor details see Common Setpoints.ALARM FUNCTIONRange: Disabled, Alarm, Latched AlarmDefault: DisabledThe selection of Alarm or Latched Alarm setting enables the alarm function.
