Cooling Air Quality; Interlock Circuit For The External Fan; Thermal Motor Protection - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

4.3

Cooling air quality

The cooling air is only permitted to have weak chemically aggressive properties and must only
have low levels of oil or dust.
4.4

Interlock circuit for the external fan

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
Operating instructions, external fan (Page 144)
Force-ventilated 1PH818. and 1PH822. motors are equipped as standard with an external fan
with electronically commutated motor (EC motor); this is optional for 1PH828. motors.
CAUTION
Voltage fluctuations
The electronics of the external fan equipped with EC motor can be damaged as a result of
voltage fluctuations. Supply the external fan with power from the line supply and not via a
frequency converter.
4.5

Thermal motor protection

The machine is equipped as standard with a KTY 84 temperature sensor, optionally with PTC
thermistors to directly monitor the motor temperature to protect the machine against overload
in operation. Plan a corresponding circuit for monitoring.
See also
Connecting the temperature sensor (Page 71)
SIMOTICS M-1PH8
Operating Instructions 05/2012 A5E03986435A AA
Preparations for use
4.5 Thermal motor protection
31