Advanced commissioning
7.7 Protection functions
Converter with control units CU250D-2
230
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
PTC sensor
The converter interprets a resistance >
1650 Ω as being an overtemperature and
responds according to the setting for p0610.
The converter interprets a resistance < 20 Ω as being a short
-circuit and responds
with alarm A07015. If the alarm is present for longer than 100 milliseconds, the con-
verter shuts down with fault F07016.
KTY84 sensor
NOTICE
Motor overheating due to incorrectly connected KTY sensor
If a KTY sensor is connected with incorrect polarity, the motor can become damaged due to
overheating, as the converter cannot detect a motor overtemperature condition.
•
Connect the KTY sensor with the correct polarity.
Using a KTY sensor, the converter monitors the motor temperature and the sensor
itself for wire-break or short-circuit:
●
Temperature monitoring:
The converter 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 converter 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 converter interprets a resistance > 2120 Ω as a wire
-break and outputs the alarm
A07015. After 100 milliseconds, the converter changes to the fault state with F07016.
–
Short-circuit:
The converter interprets a resistance <
50 Ω as a short
-circuit and outputs the alarm
A07015. After 100 milliseconds, the converter changes to the fault state with F07016.
