Pilz Cable PMCprimoDrive>Mod-Profibus:L=0,45m - Manual (Page 19)

Operating Manual: PMCtendo AC 4-3
Holding brake
As an option, the PMCtendo AC servo motors may be supplied with a built-in holding
brake, for backlash-free holding of the axis at standstill or when the supply to the plant or
machine is switched off. The permanent magnet brake blocks the rotor when the supply
voltage is switched off. Once the brake is released, the rotor can move without residual
torque.
INFORMATION
Only use the holding brake when the axes are at standstill!
It may not be used for dynamic braking mode. Make sure you read the holding brake
information provided in the chapters entitled “Wiring” and “Technical Details”.
The holding brake does not guarantee personal protection!
Personal protection can only be achieved by using a second brake and through
additional higher level design measures (e.g. guard).
Motor shaft and bearings
PMCtendo AC servo motors are available with two different types of shaft end (drive
end):
• Shaft end with feather key groove
Rotor balancing is performed using a half feather key. These shaft ends are suitable
for low loads. Under continuous duty with varying torques or strong reverse mode, the
feather key may become unseated. If this is the case the true running quality is
reduced; there is backlash. Increasing deformation can break the feather key and
damage the drive shaft.
• Smooth shaft end
With a frictional connection, torque transfer must only be achieved through surface
pressure. This guarantees a safe, backlash-free force transfer.
• Bearings
The bearings are lubricated with maintenance-free grease which is resistant to high
temperatures.