Pilz Cable PMCprimoDrive>Mod-Profibus:L=0,45m - Manual (Page 18)

Function Description
4-2 Operating Manual: PMCtendo AC
Motor feedback system
PMCtendo AC servo motors may be equipped with one of the following motor feedback
systems:
• Resolver (2-pole)
The resolver determines the absolute position of the rotor to the stator within a
revolution and signals this information to the servo amplifier. This feeds sinusoidal
currents to the winding on the servo amplifier, depending on the rotor position.
• Hiperface-compatible feedback system for SinCos encoder
A Hiperface-compatible feedback system operates with differential signals in
accordance with the RS 485 specification.
The absolute position of the rotor to the stator is determined on power up and is
signalled to the counter in the servo amplifier via the parameter channel. The counter
then continues to count incrementally, based on this absolute value. For this purpose
the analogue sine/cosine voltage is transmitted via the process data channel and is
converted within the servo amplifier.
- Hiperface single-turn for SinCos encoder
With the Hiperface single-turn, only one shaft revolution is triggered. One shaft
resolution is transmitted in 32 768 steps.
- Hiperface multi-turn for SinCos encoder
With the Hiperface multi-turn, several shaft revolutions are triggered. A maximum of
4096 revolutions can be transmitted, each in 32 768 steps.
Operating mode
PMCtendo AC servo motors are designed for continuous duty. This corresponds to
operating mode S1 (in accordance with DIN EN 60 034-1).
Overload protection
PMCtendo AC servo motors have overload protection, which protects the stator winding
from damage in the case of constant overload. The motor temperature is monitored via a
thermal switch in the stator winding. The contact on the thermal switch is opened when
the winding temperature is exceeded. The switch does not protect against temporary
high overload.
The thermal switch incorporated into the motor winding must be monitored and
evaluated by the servo amplifier.