nord NORDAC FLEX SK 2 E-111-123-A Series, Руководство пользователя

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4 Commissioning
BU 0200 en-US-4920 117
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4.4 Temperature sensors
The current vector control of the variable frequency drive can be further optimized by the use of a
temperature sensor
. By continuous measurement of the motor temperature, the highest control
accuracy for the variable frequency drive and the associated optimum speed accuracy of the motor
are achieved at all times and under any load. Since the temperature measurement starts immediately
after the (line power) actuation of the variable frequency drive, the variable frequency drive provides
immediate optimum control even if the motor has a considerably elevated temperature after an
intermediate "Power Off/Power On" of the variable frequency drive.
Information
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 (operating point like with the
thermistor) causes the drive unit to shut down with error message E002.
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Information
Pay attention to polarity
Temperature sensors are wired semiconductors that must be operated in the conducting direction. In
order to do this, the anode must be connected to the "+" contact of the analog input. The cathode
must be connected to earth.
Failure to observe this can lead to erroneous measurements. Motor winding protection will no longer
be guaranteed.
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Approved temperature sensors
The function of approved temperature sensors is comparable. However, their characteristic curves
differ. Correct matching of the characteristic curves to the variable frequency drive 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
PT100 2.7 0.36 0.49
PT1000 2.7 2.68 3.32
1) Xx = Parameter array, depending on the analog input used
Table 12: 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.
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