Safety and commissioning information for Ex areas
14.1 Motor protection functions (overload protection, thermistor protection)
SIMOCODE pro
308 System Manual, 05/2019, A5E40507475002A/RS-AD/004
Depending on the number of sensors, the following tripping and restart temperatures will
result based on the TNF (rated response temperature of the sensor):
Table 14- 1 Tripping and restart temperatures
6 sensors TNF -5 K TNF -20 K
The temperatures listed are limit values.
Set the response for the activated thermistor to "Trip"!
14.1.3.4 Sensor circuit wiring
Installing the measuring circuit cables
Lay the measuring circuit cables as separate control cables. It is not permissible to use the
cores of the motor supply cable or other main supply cables.
Shielded control cables should be used if extremely inductive or capacitive interference is
expected as a result of power cables routed in parallel.
Maximum cable lengths of the sensor circuit cables:
Table 14- 2 Maximum cable length of the sensor circuit cables
Cable lengths (single) at the thermistor input
Without short-circuit detection
With short-circuit detection
1)
2
2
0.5 mm
2
500 m 50 m
1) A short circuit in the sensor circuit will be detected up to these maximum cable lengths.
Evaluation of the short-circuit detection of the sensor cable
Evaluating the short-circuit detection of the sensor cable is recommended.
If the short-circuit detection of the sensor cable is not evaluated, when commissioning or
after modifications / maintenance work (assembly, disassembly) of the system, the sensor
resistor must be measured using a suitable measuring instrument.
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