IndustrialDriveDataDrive Board & Diagnostic Database
Motor protection / sensor input

Siemens 6SE70 Motor Thermal Sensor Path

Routes KTY84 and PTC motor-temperature evidence through terminal input, expansion-board context and configured warning/fault response.

Circuit-path evidence record6 min read

Scope of this technical record

KTY84/PTC sensor path from motor terminal box through drive terminal/option interface to configured warning or trip response.

Safety boundary

Sensor checks must preserve the protective function. Do not bridge or simulate a healthy sensor to keep production running without root-cause evidence.

6SE70 motor thermal sensor path

1Motor sensor
→
2Terminal box
→
3Cable
→
4Drive input
→
5Trip logic

The path keeps KTY/PTC protection functional while the sensor route is checked.

6SE70 motor thermal sensor image

6SE70 motor thermal sensor path motor sensor terminal box cable drive input trip logic
The image keeps KTY/PTC protection active while the wiring path is checked.

Path description

The thermal sensor path begins at the embedded motor sensor, passes through the motor terminal box and cable route, enters the drive terminal or expansion interface, then becomes a configured warning or trip response. Each node can create false or real thermal evidence.

A cold-start fault is usually a continuity/type/terminal question. A hot/load fault requires cooling evidence and motor condition before the drive input is blamed.

Field record checklist

  • Sensor type
  • Motor terminal continuity
  • Cable and shield route
  • Drive terminal identity
  • Cold versus load timing
  • Cooling evidence

Technical basis and reference documents

This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.

SIMOVERT MASTERDRIVES Vector Control Operating InstructionsSiemens Industry Support

OEM basis for 6SE70 / 6SE71 safety, control connections, motor temperature evaluation and option context.

SIMOVERT MASTERDRIVES brake and thermal protection evidence notesIndustrialDriveData editorial extraction

Internal technician note set used only to structure public diagnostic routes around KTY/PTC thermal protection and brake-control evidence.

Evidence intake

Turn this record into a qualified service request

A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.

  • Complete drive type code / MLFB or nameplate model
  • Fault code, fault value and first event before reset
  • When the event appears: power-up, enable, ramp, run, decel or stop
  • Motor/cable connected or isolated during the symptom
  • Visible board, option-card, module and connector identifiers
  • Previous repair history, replacement parts and repeat-failure pattern
Prepare request →