Inspecting The Rtd Wiring - ABB Relion 630 Series Operation Manual

1MRS756509 E
7.3.3.2
630 series
Operation Manual
The second signal is the status Normal or Forced. Forced status is only
achieved when the BO is set to "Forced" or operated on the LHMI.
An initially high contact resistance does not cause problems as it is reduced quickly by
the electrical cleaning effect of fritting and thermal destruction of layers, bringing the
contact resistance back to the mOhm range. As a result, practically the full voltage is
available at the load.

Inspecting the RTD wiring

• Verify the sensor measuring mode by using a suitable resistor instead of a real
sensor.
• PT100 80...170 Ω
• PT250 220...430 Ω
• NI100 80...240 Ω
• NI120 100...280 Ω
• CU10 8...16 Ω
Resistance measuring mode can be verified with a resistance from 0...10 KΩ.
Table 18: Examples of temperature and resistance
PT 100
R °C
7.5 -
8.2 -
9.1 -
10 -
11 -
12 -
13 -
15 -
82 -45.8
91 -23
100 0
110 25.7
120 51.6
150 130.5
160 157.2
180 -
Table continues on next page
Set the parameter TestMode to "Off" after completing these
tests. The Start LED stops flashing when the relay is no
longer in test mode.
PT 250 NI 100
°C °C
- -
- -
- -
- -
- -
- -
- -
- -
- -34.2
- -16.5
- 0
- 18
- 35
- 82.6
- 97.5
- 125.5
Section 7
Troubleshooting
NI 120 CU 10
°C °C
- -39.8
- -21.6
- 1.7
- 25
- 50.9
- 76.9
- 102.8
- 154.6
- -
-46.7 -
-31.5 -
-15.5 -
0 -
43.3 -
56.8 -
84 -
91