SIEMENS
6/5
Siemens MD 50.8 · 2017
Motor options
Electrical design
Motor protection
6
■
KTY 84-130 temperature sensor
This sensor is a PTC thermistor that changes its resistance de-
pending on the temperature in accordance with a defined curve.
The KTY 84-130 temperature sensor can be used for monitoring
the motor temperature in inverter operation.
Some inverters determine the motor temperature using the resis-
tance of the temperature sensor. They can be set to a required
temperature for warning and disconnection.
In order to prevent serious damage by impulse voltage peaks to
the sensor and the downstream evaluation electronic circuitry
which can occur in inverter operation as a result of the close con-
tact between temperature sensor and winding, the connecting
cables and the temperature sensor have reinforced insulation
designed to provide "protective separation".
Fig. 6/5
Connection circuit diagram
Fig. 6/6
Temperature sensor characteristic
■
1x PT100 resistance thermometer
This sensor is a PTC thermistor and at 0 °C has a resistance of
100
. Its resistance changes almost linearly in the range
between 0 and 100 °C. Changes in temperature are transferred
to an evaluation device in the form of resistance changes.
The evaluation device is not included in the scope of supply.
In order to prevent serious damage by impulse voltage peaks to
the sensor and the downstream evaluation electronic circuitry
which can occur in inverter operation as a result of the close
contact between resistance thermometer and winding, the con-
necting cables and the resistance thermometer have reinforced
insulation designed to provide "protective separation".
Fig. 6/7
Connection circuit diagram
Fig. 6/8
Resistance thermometer characteristic
Order code:
KTY 84-130 temperature sensor
M16
G_D087_XX_00137
=2R1
P19
= 2R2
P20
2R1
PE
-
2R2
1
2
-M
27
2R1
28
2R2
2R1
2R2
3
2
k
R
1
0
0
50
100
150
200
250
°C
T
U
D
= 2 mA
300
2.5
1.5
0.5
G_D087_EN_00072a
Order code:
1x PT100 resistance thermometer
M19
=5R1
P25
=5R2
P26
5R1
PE
-
5R2
1
2
-G
57
5R1
58
5R2
5R1
5R2
G_D087_XX_00134
[°C]
450
400
350
300
250
200
150
100
50
-50
0
[
]
50
150
250
100
200
G_D087_EN_00157
Temperature
Resistance
© Siemens AG 2017