Product description
Operating Manual PMCtendo SZ
1002405-EN-04
14
3.6
Thermal winding protection
The PMCtendo SZ synchronous servo motors have thermal winding protection that protects
the stator winding from damage during constant overload.
The PMCtendo SZ motors are equipped with a PTC thermistor. If the motor temperature
reaches a critical value, the resistance of the PTC resistors increases abruptly and thereby
indicates the overload of the motor.
NOTICE
Every thermal winding protection has to be monitored and evaluated by a
servo amplifier or an external triggering device.
3.7
Cooling
PMCtendo SZ synchronous servo motors are sized for convection cooling by default.
In order to increase the performance of the motors, they can optionally be equipped or up-
graded with external forced ventilation systems (IP44 protection class).
In applications requiring a higher protection class than IP44 or a lower noise load, servo
motors can be water-cooled in the A-side flange.
3.8
Holding brake
DANGER!
Risk of fatal injury!
The motor brake is not a safety brake.
– Check whether additional protective measures have to be taken,
such as when stopping or standing under suspended loads.
Since the synchronous servo motors can be braked actively and quickly using correspond-
ing reference value specifications on the servo amplifier, the built-in brakes have the func-
tion of a holding brake.
For holding the motor shaft in place without any backlash, the synchronous servo motors
can be delivered with a built-in permanent magnet holding brake. It blocks the rotor when
de-energized.
An electro-mechanical method is used to release the brake. The applied voltage generates
an electromagnetic field that counteracts the field from the permanent magnet and neutral-
izes its effect.
NOTICE
The air gap in the holding brake cannot be adjusted later.
