Pilz PMCtendo SZ.41/0/1/2/7/K/H/60/00 - Manual (Page 15)

Operating Manual PMCtendo SZ 
1002405-EN-03
15
3 Description
3.6 Thermal winding protection
The servo motors have a thermal winding protection, which protects the stator winding
from damage in the case of constant overload.
The PMCtendo SZ motors are fitted with PTC drilling as standard. If the motor tempera-
ture reaches a critical level, the ohmic resistance of the PTC resistors increases abruptly
and this indicates motor overload.
3.7 Cooling
As standard the servo motors are dimensioned for convection cooling.
In order to increase the continuous torque output or continuous power output, the servo
motors can be fitted as an option with external fan systems (IP44). External fan systems
can be retrofitted.
In applications requiring a higher protection class than IP44 or a lower noise level, the
servo motors can be water-cooled in the A-side flange.
3.8 Holding brake
WARNING!
Danger to life!
The motor brake is not a safety brake!
 Check whether additional safety measures must be taken, e. g. when remaining un-
der suspended loads.
3.8.1 Motor holding brake
The servo motors may be supplied with a built-in permanent magnet brake for backlash-
free holding of the motor shaft. This blocks the rotor when the supply voltage is switched
off. The brake has electromechanical ventilation: The applied voltage generates a mag-
netic field that counteracts the permanent magnetic field and neutralises its influence.
INFO
Each thermal winding protection must be monitored and evaluated by the
servo amplifier or an external triggering device.