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S3 PROTECTION
6–114
THE RTD TROUBLE ALARM
All RTDs that are programmed with either an alarm or a trip are monitored for sensor
failure. When the measured temperature is greater than 300ºC or less than -50ºC, the RTD
is declared failed and a common RTD trouble alarm is issued.
RTD TROUBLE ALARM
Range: Disable, Enable
Default: Disable
This setting enables the RTD Trouble Alarm functionality.
OUTPUT RELAY 4 to 6 / OUTPUT RELAY 5 to 6
Range: Do Not Operate, Operate
Default: Do Not Operate
Any assignable output relay can be selected to operate upon RTD Trouble Alarm
operation. When the SWITCHING DEVICE is selected as BREAKER, the assignable output
relays will be Output Relay 4~6. When the SWITCHING DEVICE is selected as CONTACTOR,
the assignable output relays will be Output Relay 5~6.
BLOCK 1 to 3
Range: Off, Contact Input 1 to 10, Virtual Input 1 to 32, Remote Input 1 to 32, Logic
Element 1 to 16
Default: Off
Three blocking inputs are provided for RTD Trouble Alarm. When any of the selected
blocking inputs is on, both RTD Trouble Alarm functionality is blocked.
Table 3: RTD Temperature vs Resistance
Temperature
o
C
–50
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
o
F
–58
–40
–22
–4
14
32
50
68
86
104
122
140
158
176
194
212
230
248
266
284
302
320
338
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
100 Ω Pt (DIN 43760)
80.31
84.27
88.22
92.16
96.09
100.00
103.90
107.79
111.67
115.54
119.39
123.24
127.07
130.89
134.70
138.50
142.29
146.06
149.82
153.58
157.32
161.04
164.76
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