4 Commissioning
BU 0600 en-2319 69
4.4 Temperature sensors
The current vector control of the frequency inverter can be further optimised by the use of a
temperature sensor. By continuous measurement of the motor temperature, the highest precision of
regulation by the frequency inverter and the associated optimum speed precision of the motor is
achieved at all times. As the temperature measurement starts immediately after (mains) switch-on of
the frequency inverter, the frequency inverter provides immediate optimum control, even if the motor
has a considerably increased in temperature after an intermediate "Mains off / Mains on" of the
frequency inverter.
To determine the stator resistance of the motor, the temperature range 15 … 25 °C should not be
exceeded.
Excess temperature of the motor is also monitored and at 155 °C
(switching threshold for the
thermistor) causes the drive unit to shut down with error message E002.
Pay attention to polarity
Temperature sensors are wired semiconductors that must be operated in the conducting direction.
For this, the anode must be connected to the "+" contact of the analogue input. The cathode must be
connected to the "-" ground or ground contact of the analogue input.
Failure to observe this can lead to false measurements. Motor winding protection is therefore no
longer guaranteed.
Approved temperature sensors
The function of approved temperature sensors is comparable. However, their characteristic curves
differ. Correct matching of the characteristic curves to the frequency inverter is made by changing the
following two parameters.
Sensor type Shunt resistor P402[xx]
1)
0 % Adjustment P403[xx]
1)
100 % Adjustment
[kΩ] [V] [V]
KTY84-130 2.7 1.54 2.64
PT1000 2.7 2.68 3.32
Xx = Parameter array, depending on the analog input used
Table 21: Temperature sensors, adjustment
Connection of a temperature sensor is made according to the following examples.
Taking into account the relevant values for the 0% adjustment [P402] and 100% adjustment [P403],
these examples can be used for all of the approved temperature sensors which are stated above.
Connection examples
A KTY-84 sensor can be connected to either of the two analogue inputs of the relevant option. In the
following examples, analogue input 2 is used.
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