Connection of thermal motor protection TF, TH, KTY84, PT1000

Motors with an internal temperature sensor (TF, TH, KTY84, PT1000, or equivalent) can be connected directly to the inverter.

If the thermal protection is triggered, the inverter displays the fault "F-PTC".

For motor protection monitoring, the following types can be selected:

  • PTC-th for thermal sensor TF or bimetallic switch TH with trigger threshold 2.5 kΩ
  • KTY84 in temperature classes B (120 °C), F(155 °C) and H (180 °C)
  • PT1000 in temperature classes B (120 °C), F(155 °C) and H (180 °C)

Use a shielded cable for the motor sensor lead.

The motor temperature can be read out using index 11234.

INFORMATION

First configure the connected temperature sensor using parameter P2-33 before connecting the temperature sensor. Then connect the temperature sensor according to the wiring diagrams. Incorrect connection may result in damage to the sensor or inverter.

Connection example of the different temperature sensors and their parameterization:

TF temperature sensor

TH bimetallic switch

KTY84

PT1000

P2-33 = PTC-th

P2-33 = KTY84 or PT1000 (B, F, H)

P1-15 = 0For the setting P1-15 = 0 (free terminal assignment), the terminal assignment must be made via the parameter group 9. No function may be assigned to input DI5/AI2 in this case., 6, 7, 16, 17

P1-15 = 01)