CHAPTER 5: SETTINGS TRANSDUCER INPUTS/OUTPUTSM60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2775RRTD 1 ID — Assign an alphanumeric ID to the remote RTD. This ID is included in the remote RTD actual values. It is also usedto reference the remote RTD input to features using the remote RTD.RRTD 1 TYPE — This setting specifies the remote RTD type. Four different RTD types are available: 100 Ω Nickel, 10 Ω Copper,100 Ω Platinum, and 120 Ω Nickel.The RRTD converts resistance to temperature as per the values in the following table. The M60 reads the RTD temperaturesfrom the RRTD once every five seconds and applies protection accordingly. The RRTDs can be used to provide RTD bias inthe existing thermal model.Table 5-34: RTD temperature vs resistanceAn RRTD open condition is detected when actual RRTD resistance is greater than 1000 ohms and RRTD open is displayedas “250°C” in the M60.An RRTD short condition is detected when actual RRTD temperature is less than –40°C and RRTD short is displayed as is “–50°C” in the M60.RRTD 1 APPLICATION — This setting allows each remote RTD to be assigned to a group application. This is useful forapplications that require group measurement for voting. A value of “None” specifies that the remote RTD operatesindividually and not part of any RTD group. All remote RTDs programmed to “Stator” are used for RTD biasing of the M60thermal model. Common groups are provided for rotating machines applications, such as ambient, bearing, group 1, orgroup 2. If the REMOTE RTD 1 TRIP VOTING setting value is “Group”, then it is allowed to issue a trip if N – 1 RTDs from thesame group also pick up, where N is the number of enabled RTDs from the group.RRTD 1 ALARM TEMPERATURE — This setting specifies the temperature pickup level for the alarm stage. The range of 1 to200°C differs from the existing RTD settings to correspond to the range of the RRTD unit.Temperature Resistance (in ohms)°C °F 100 ohm Pt(DIN 43760)120 ohm Ni 100 ohm Ni 10 ohm Cu–40 –40 84.27 92.76 79.13 7.49–30 –22 88.22 99.41 84.15 7.88–20 –4 92.16 106.15 89.23 8.26–10 14 96.09 113 94.58 8.650 32 100 120 100 9.0410 50 103.9 127.17 105.6 9.4220 68 107.79 134.52 111.2 9.8130 86 111.67 142.06 117.1 10.1940 104 115.54 149.79 123 10.5850 122 119.39 157.74 129.1 10.9760 140 123.24 165.9 135.3 11.3570 158 127.07 174.25 141.7 11.7480 176 130.89 182.84 148.3 12.1290 194 134.7 191.64 154.9 12.51100 212 138.5 200.64 161.8 12.9110 230 142.29 209.85 168.8 13.28120 248 146.06 219.29 176 13.67130 266 149.82 228.96 183.3 14.06140 284 153.58 238.85 190.9 14.44150 302 157.32 248.95 198.7 14.83160 320 161.04 259.3 206.6 15.22170 338 164.76 269.91 214.8 15.61180 356 168.47 280.77 223.2 16190 374 172.46 291.96 231.6 16.39200 392 175.84 303.46 240 16.78
