GE M60

5-336 M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
TRANSDUCER INPUTS/OUTPUTS CHAPTER 5: SETTINGS
5
RRTD 1 ID — Assign an alphanumeric ID to the remote RTD. This ID is included in the remote RTD actual values. It is also used
to 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  Nickel, 10  Copper,
100  Platinum, and 120  Nickel.
The RRTD converts resistance to temperature as per the values in the following table. The M60 reads the RTD temperatures
from the RRTD once every five seconds and applies protection accordingly. The RRTDs can be used to provide RTD bias in
the existing thermal model.
Table 5-45: RTD temperature vs resistance
An RRTD open condition is detected when actual RRTD resistance is greater than 1000 ohms and RRTD open is displayed
as “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 for
applications that require group measurement for voting. A value of “None” specifies that the remote RTD operates
individually and not part of any RTD group. All remote RTDs programmed to “Stator” are used for RTD biasing of the M60
thermal model. Common groups are provided for rotating machines applications, such as ambient, bearing, group 1, or
group 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 the
same 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 to
200°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 8.65
0 32 100 120 100 9.04
10 50 103.9 127.17 105.6 9.42
20 68 107.79 134.52 111.2 9.81
30 86 111.67 142.06 117.1 10.19
40 104 115.54 149.79 123 10.58
50 122 119.39 157.74 129.1 10.97
60 140 123.24 165.9 135.3 11.35
70 158 127.07 174.25 141.7 11.74
80 176 130.89 182.84 148.3 12.12
90 194 134.7 191.64 154.9 12.51
100 212 138.5 200.64 161.8 12.9
110 230 142.29 209.85 168.8 13.28
120 248 146.06 219.29 176 13.67
130 266 149.82 228.96 183.3 14.06
140 284 153.58 238.85 190.9 14.44
150 302 157.32 248.95 198.7 14.83
160 320 161.04 259.3 206.6 15.22
170 338 164.76 269.91 214.8 15.61
180 356 168.47 280.77 223.2 16
190 374 172.46 291.96 231.6 16.39
200 392 175.84 303.46 240 16.78