Thermal Motor Protection; Thermal Motor Protection Using Ptc Thermistors (Option); Interlock Circuit For The Automatic Regreasing System (Option); Interlock Circuit For Anti-Condensation Heating - Siemens SIMOTICS FD 1MQ1 Operating And Installation Instructions

4.6

Thermal motor protection

The machine is equipped with measuring equipment for direct monitoring of the motor
temperature to protect the machine against overload during operation. Plan a corresponding
circuit for monitoring.
4.7

Thermal motor protection using PTC thermistors (option)

The machine is equipped with PTC thermistors for direct monitoring of the motor temperature
to protect the machine against overheating during operation. Plan a corresponding circuit for
monitoring.
4.8

Interlock circuit for the automatic regreasing system (option)

Relubrication is permitted only for a rotating shaft. Consequently, deploy an interlock circuit for
machines with automatic regreasing system to prevent them from operating at machine
standstill.
4.9

Interlock circuit for anti-condensation heating

If the anti-condensation heating is operated while the machine is running, this can increase the
temperatures inside the machine.
● Install an interlock circuit that switches off the anti-condensation heating once the main
● Only switch on the anti-condensation heating after the machine has been switched off.
See also
Safety instructions for operation (Page 109)
Explosion hazard
If the anti-condensation heating is switched on directly after the machine is switched off, the
temperature class or the maximum surface temperature of the machine can be exceeded.
In an explosive atmosphere, there is a risk of an explosion. This can result in death, serious
injury or material damage.
● Only switch on the anti-condensation heating after the motor has been switched off.
SIMOTICS FD 1MQ1
Operating Instructions 01/2019
machine is switched on.
WARNING
Carefully comply with the data on the anti-condensation heating plate.
Preparations for use
4.6 Thermal motor protection
31