Connecting The Ptc Thermistor Of The Motor To The Inverter; Connection Of External Control Voltage; Provide Fuse Protection For External Control Voltage; Use Of External Control Voltage - Siemens SINAMICS G180 Installation And Operating Instructions Manual

6.6.7

Connecting the PTC thermistor of the motor to the inverter

● Connect the PTC thermistor of non-explosion-protected motors without peripheral board
● If peripheral board 2 / 4 is installed, connect the PTC thermistor to terminals 90 to 94 of
6.7

Connection of external control voltage

6.7.1

Provide fuse protection for external control voltage

External control voltage without fuse protection
If you connect an external control voltage without providing suitable fuse protection,
overloading and short circuits can occur. This can result in death, serious injury or material
damage.
The device may only be operated with a protected external control voltage. Note the following
recommendation.
Install one of the following options to protect the external control voltage:
● Miniature fuse in accordance with EN 60127: 2 A ... 6 A, slow, maximum 150 VA
● Miniature circuit-breaker: 2 A ... 6 A, characteristic D, maximum 150 VA
6.7.2

Use of external control voltage

The inverter generates the control voltage from the DC link voltage in normal operation.
Use external control voltage in the following cases:
Installation and operating instructions Sinamics G180
Operating Instructions, 05/2013, 4BS0751-001
2 / 4 to terminals 27, 28 - 58 of control cable terminal block -X2.
control cable terminal block –X3. For additional information, refer to the description of the
accessories.
Note
Interference signals in PTC thermistor cables
If you lay sensor cables next to power cables, interference signals can be transmitted in
the sensor cables. Lay sensor cables separated from the motor power cables. Use
shielded cables in the case of stronger inductive or capacitive input couplings. Observe
the minimum cross section of the PTC thermistor cable.
WARNING
Electrical connection
6.7 Connection of external control voltage
61