Interlock Circuit For The External Fan Motor; Thermal Motor Protection; Thermal Motor Protection Using Ptc Thermistors (Option); Interlock Circuit For The Automatic Regreasing System (Option) - Siemens SIMOTICS FD 1LN1 Operating Instructions & Installation Instructions

Preparations for use

4.7 Interlock circuit for the external fan motor

4.7 Interlock circuit for the external fan motor
Interlock circuit for the external fan motor
For machines with external fans, install an interlock circuit that prevents the main machine
being switched on if the external fan is not operational.
See also
Connecting an external fan motor (Page 96)
4.8

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.
4.9

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.
4.10

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.
4.11

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 115)
38
machine is switched on.
SIMOTICS FD 1LN1
Operating Instructions 01/2019