Advanced commissioning
7.15 Motor temperature monitoring using a temperature sensor
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257324B AF
177
PTC sensor
The inverter interprets a resistance > 1650
Ω
as being an overtemperature and re-
sponds according to the setting for p0610.
For motors generally equipped with 3 PTC, a minimum resistance value of 20
Ω
is
required for short-circuit monitoring for each PTC. If fewer PTC are used in the mo-
tors, the total resistance must be at least 50
Ω
.
If the total resistance is below these values, the inverter responds with alarm
A07015.
If the alarm lasts more than 100 ms, the inverter responds with fault F07016.
The p4621 parameter can be used enable or disable short-circuit monitoring.
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 inverter cannot detect a motor overtemperature condition.
•
Connect the KTY sensor with the correct polarity.
Using a KTY sensor, the inverter monitors the motor temperature and the sensor
itself for wire-break or short-circuit:
●
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 responds with a 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 responds with fault F07016.
–
Short-circuit:
The inverter interprets a resistance < 50
Ω
as a short-circuit and responds with alarm
A07015. After 100 milliseconds, the inverter responds with fault F07016.
