Power Electronics SD750FR, Руководство по аппаратному обеспечению и установке

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POWER ELECTRONICS SD750FR
CONTROL CONNECTION
61
AI3 (PIN 21/22) PT100 mode.
The AI3 allows configuring a PT100 sensor. With this sensor, motor temperature can be measured
continuously. Ground cable screening must be connected only in one end. For further information about
parameter configuration, consult the Software and Programming Manual.
Measurement process:
a. The chosen analogue output will be configured in current mode, 10 mA, through software. It is
recommended to use analogue output 1.
b. The analogue input 3 (AI3) will be configured in PT100 mode through software.
c. A current of 1mA (generated by the analogue output) is injected through the PT100.
d. Voltage in the analogue input is measured.
e. With injected current and voltage, the PT100 resistance is calculated.
f. With the PT100 table, and knowing the resistance, temperature is obtained.
NOTICE
Terminals PIN14 and PIN15 can be used for other functions depending on the inverter bridge
characteristics (frequency regulation by external potentiometer, analogue feedback, etc.). to avoid
multiple connections in one terminal (PIN 14, PIN 15), it is advisable to add external terminals for
supply distribution.