Connections of a motor thermistor (PTC sensor).
When the AO1 (analog output) terminal is connected to the PTC thermistor (temperature sensor
installed in a motor), the inverter supplies constant current to the temperature sensor. Connect the
PTC signal wire (voltage) to one of the inverter’s analog input terminals. This allows the inverter to
detect the changes in the PTC resistance and translates it into voltage. When the inverter detects
a motor overheat, a “Thermal Trip” occurs after a fixed delay time. The “Thermal Trip” cannot be
reset until the PTC input goes below the PRT-36 level.
To receive the PTC signal at V1 input terminal:
1.
Set switch SW3 (Analog Input V1/TI) on the IO TB PCB to T1 (right). The sensor does not
operate if SW3 is set to ’V1’.
2.
Set PRT-34 to Free-Run or Decel to activate monitoring and trip function.
3.
Set PRT-35 (Thermal InSrc) to ‘0 (Thermal In)’.
4.
Set PRT-36 to a % above which will cause a “Thermal Trip”.
5.
Set PRT-37 to high.
To receive the PTC signal at I2 input terminal:
1.
Set switch SW4 (Analog Input I2/V2) on the IO TB PCB to V2 (right). The sensor does not
operate if SW4 is set to ‘I2’.
2.
Set PRT-35 (Thermal InSrc) to ‘1 (V2)’.
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