Setting functions
8.6 Protection functions
Inverter with CU230P-2 Control Units
262 Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
Use a KTY sensor to monitor the motor temperature and the sensor itself for wire-break or
short-circuit.
Motor destruction through overheating
If a KTY sensor is connected with the incorrect polarity, the motor can be destroyed due to
overheating, as the inverter cannot detect a motor overtemperature condition.
Connect the KTY sensor with the correct polarity.
● Temperature monitoring:
The inverter uses a KTY sensor to evaluate the motor temperature in the range from
-48 °C ... +248 °C.
Use the p0604 or p0605 parameter to set the temperature for the alarm and fault
threshold.
– Overtemperature alarm (A07910):
- motor temperature > p0604 and p0610 = 0
– Overtemperature fault (F07011):
The inverter switches off with fault in the following cases:
- motor temperature > p0605
- motor temperature > p0604 and p0610 ≠ 0
● Sensor monitoring (A07015 or F07016):
– Wire-break:
The inverter interprets a resistance > 2120 Ω as a wire-break and outputs the alarm
A07015. After 100 milliseconds, the inverter changes to the fault state with F07016.
– Short-circuit:
The inverter interprets a resistance < 50 Ω as a short-circuit and outputs the alarm
A07015. After 100 milliseconds, the inverter changes to the fault state with F07016.
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