Operating Instructions ACTIVE 06/07190
190 Operating Instructions ACTIVE 06/07
17.7.2 Temperature Adjustment
The field-orientated control modes are based on the most precise calculation of the
machine model possible. The rotor time constant is an important machine variable for
the calculation. The value to be read out via the parameter
Act. Rotor Time Constant
227 is calculated from the inductivity of the rotor circuit and the rotor resistance. The
dependence of the rotor time constant on the motor temperature can be taken into
account in the case of particularly high precision requirements via a suitable meas-
urement. Via
Operation Mode 465 for the temperature adjustment, you can select
different methods and actual value sources for temperature measurement.
Operation mode 465 Function
0 - Off The function is deactivated.
1 - Temp. Meas. on MFI1A
Temperature synchronization
(0 ... 200
°
C => 0 ... 10 V / 0 ... 20 mA),
actual temperature value at multifunctional input 1.
4 - Temp. Meas. at Start
Determination of temperature by frequency in-
verter via measurement of the winding resistance
without external temperature measurement.
Operation mode 1 requires an external temperature measurement system which
evaluates the temperature sensor and maps the temperature range from 0...200 °C to
an analog voltage or current signal. The
Operation Mode 452 of multifunction input
MFI1 must be selected accordingly.
Operation mode 4 is available in configurations 210 and 230. When the signals Con-
troller release and Start clockwise or Start anticlockwise are present, the motor tem-
perature and the rotor time constant are synchronized by means of the measured
winding resistance.
The material used for the rotor winding of the motor is taken into account via the
parameter
Temperature Coefficient 466. This value defines the change of the rotor
resistance as a function of the temperature for a certain material of the rotor winding.
Typical temperature coefficients are 39%/100 °C for copper and 36%/100 °C for alu-
minum at a temperature of 20°C.
The temperature characteristic within the software is calculated via the aforemen-
tioned temperature coefficient and the parameter
Temperature Adjustment 467. The
adjustment temperature enables an additional optimization of the rotor time constant
alongside the parameter
Rated Slip Correction Factor 718.
Parameter Settings
No. Description Min. Max. Fact. sett.
466 Temperature Coefficient 0.00%/100 °C 300.00%/100 °C 39.00%/100 °C
467 Adjusting Temperature -50 °C 300 °C 35 °C
The synchronization of the rotor time constant as a function of the winding tempera-
ture can be adjusted. The default values should normally be sufficiently precise so that
neither an adjustment of the rotor time constants via the parameter
Rated Slip Cor-
rection Factor
718 nor an adjustment of the temperature synchronization via the
parameter
Temperature Coefficient 466 is necessary. If an adjustment is necessary,
please remember that the rotor time constant is calculated by the guided commission-
ing via the machine data. The
Adjusting Temperature 467 is to be set to the tempera-
ture at which the optimization of the extended machine data was carried out. The
temperature can be read out via the actual value parameter
Winding Temperature
226 and can be used in the optimization for the parameter.
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