Siemens SINAMICS G150 Operating Instructions Manual page 116

Electrical installation
4.9 Signal connections
Danger to life due to electric shock in the event of voltage flashovers at the temperature
sensor
Voltage flashovers in the signal electronics can occur in motors without safe electrical
separation of the temperature sensors.
• Use temperature sensors that fully comply with the specifications of the safety isolation.
NOTICE
Damage or malfunctions through impermissible voltage values
If the back EMF is impermissible then damage and malfunctions may occur on the
components.
• The back EMF at the outputs may only be in the range between -15 V and +15 V.
NOTICE
Damage to motor in the event of incorrectly connected KTY temperature sensor
If a KTY temperature sensor is connected with incorrect polarity, it is not possible to detect
when the motor overheats. Overheating can cause damage to the motor.
• Connect a KTY temperature sensor with the correct polarity.
X540: Joint auxiliary voltage for the digital inputs
Table 4- 23
Max. connectable cross-section: 1.5 mm²
Note
Use of the power supply
This voltage supply is only for powering the digital inputs.
116
WARNING
Terminal block X540
Terminal
8
7
6
5
4
3
2
1
Designation
+24 V Voltage: +24 V DC
Max. total load current of +24 V auxiliary voltage for
+24 V
terminals X540 and X541 combined: 150 mA
+24 V
Continuously short-circuit proof
+24 V
+24 V
+24 V
+24 V
+24 V
Technical data
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A