CHAPTER 4: SETPOINTS MONITORING869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–325NOTENOTE:RTD type copper (Cu) is only available when order code option ‘S’ is chosen for Slot B or C.RTD ProtectionThe 869 relay can monitor up to 13 RTDs, each of which can be configured to have a triptemperature and an alarm temperature. The RTD protection setpoints can be seen only ifan LVIO card or one or two RTD modules are installed and validated.The alarm temperature is normally set slightly above the normal running motortemperature.The trip temperature is normally set at the insulation rating. Trip Voting has been added forextra security in the event of RTD malfunction. If enabled, a second RTD must also exceedthe trip temperature of the RTD being checked before a trip will be issued. If the RTD ischosen to vote with itself, the voting feature is disabled. Each RTD may also be configuredas being of application type None, Stator, Bearing, Ambient or Other. RTDs configured asStator type are also used by the thermal model for determining the RTD Bias.This element also monitors the RTD broken connection and blocks the RTD trip and alarmfunctions if the RTD connection is detected as Open or Shorted and generates RTD Openand RTD Shorted FlexLogic operands. An RTD is detected as Open when the RTDconnection is either open or the temperature is greater than 250°C. An RTD is detected asShorted when the RTD connection is either shorted or the temperature is equal to less than-40°C.–10 14 96.09 113.00 94.17 8.650 32 100.00 120.00 100.00 9.0410 50 103.90 127.17 105.97 9.4220 68 107.79 134.52 112.10 9.8130 86 111.67 142.06 118.38 10.1940 104 115.54 149.79 124.82 10.5850 122 119.40 157.74 131.45 10.9760 140 123.24 165.90 138.25 11.3570 158 127.08 174.25 145.20 11.7480 176 130.90 182.84 152.37 12.1290 194 134.71 191.64 159.70 12.51100 212 138.51 200.64 167.20 12.90110 230 142.29 209.85 174.87 13.28120 248 146.07 219.29 182.75 13.67130 266 149.83 228.96 190.80 14.06140 284 153.58 238.85 199.04 14.44150 302 157.33 248.95 207.45 14.83160 320 161.05 259.30 216.08 15.22170 338 164.77 269.91 224.92 15.61180 356 168.48 280.77 233.97 16.00190 374 172.17 291.96 243.30 16.39200 392 175.86 303.46 252.88 16.78210 410 179.53 315.31 262.76 17.17220 428 183.19 327.54 272.94 17.56230 446 186.84 340.14 283.45 17.95240 464 190.47 353.14 294.28 18.34250 482 194.10 366.53 305.44 18.73TEMPERATURE RESISTANCE (IN OHMS)°C °F 100 Ω PT(IEC 60751)120 Ω NI 100 Ω NI 10 Ω CU
