1MAC309294-MB F Section 9Other functionsRER620 431Technical Manual9.1.5 SignalsTable 385: UPS input signalsTable 386: UPS output signals9.1.6 CVD Voltage ClampingIt is possible for some embedded Capacitor Voltage Divider (CVD) sensors to measure, avoltage in excess of +/-4% tolerance, under conditions of extreme humidity or wetting ofpole surfaces. The 'CVD clamping' function clamps the measured voltage from the CVDsensors, to within +/- 4% of a reference voltage. The Clamping function is intended to beused with certain types of reclosers, please contact ABB for further clarification.The necessary reference voltage can be obtained by connecting three external potentialtransformers (PTs) to the V1abc or V2abc analog inputs of the relay [Refer to Figure 186].Alternately, in the absence of the three external PTs, the PT used to power up the reclosercontrol cabinet may be used as the reference when connected to the V1abc or V2abc inputsof the relay [Refer to Figure 187]. All applicable limitations are listed at the end of thesection.Name Type Default DescriptionSTART_TST BOOLEAN 0=False This tests the battery’s charge and overall health by brieflyconnecting a low resistance load parallel to the battery and thenmeasuring the battery voltage. The battery voltage before theload was applied and the voltage during the time the load isapplied are compared to determine battery health. The load isabout 1.5 ohms, and the connection time for the load is 0.1seconds. Ten measurements are taken and averaged together inthe last 25 milliseconds of the test period resulting in the batteryvoltage test measurement. After the battery is tested, a cooldown period for the UPS’s battery load resistors is required.During the cool down period, the battery test function is blocked.Reset UPS BOOLEAN 0=False Resets the microprocessor of the UPSName Type DescriptionTST_VOLT SIGNAL Battery voltage after test in VdcTST_RESULT ENUM Indicates the battery test result:0 = Ready for battery test1 = Battery test is registered2 = Battery interrupt for PWM3 is now enabled and is used as a timer3 = Battery test in process (lasts about 0.075 second during which Boostand Battery Charge functions are disabled4 = Battery test in process, and measurements are being taking (lastsabout 0.025 second5 = Battery test has been completed for 25 milliseconds, now take non-testbattery voltage6 = In cool-down period7 = 60VDC rail voltage too low to test8 = Within ten seconds of reset (must be at least 10 seconds out of reset tostart battery test)
