Siemens SINAMICS PERFECT HARMONY GH180 - Encoder Interface

5.3.3 Encoder Interface
Closed loop vector control requires speed feedback signals. These inputs come from an encoder
that directly senses the shaft speed and relative position of the motor being driven.
Direct Galvanic Connection
The NXGpro control encoder option uses quadrature di󹪜erential pair signal logic with HTL (9 to
15 V) logic levels for noise immunity. The control does not support a marker option for the
encoder. The recommended encoder should be isolated and meet these output speci󹪝cations.
The 15 VDC power supply for the encoder application should not be shared for other purposes.
Note the cable and shielding requirements provided with the drawings. The shielding between
the encoder and the drive must never be terminated at both ends due to the potential for
damaging noise currents.
The resulting channel A and channel B signals from the di󹪜erential pair signals are directly
proportional to the motor shaft speed. The signals are 90° out of phase with each other. The
signals switch phase relationship depending on the direction of rotation.
Figure 5-2 NXGPro+ Encoder Interface
The signal level at the input to the drive is 0.5 VDC
max
for the low signal and 13.5 to 15 VDC
nominal
(18 VDC
max
) for the high signal. Siemens recommends a minimum pulse rate of 1024 pulses per
revolution to ensure good low speed regulation.
Note
The drive requires all four feedback signals to function properly.
Hardware User Interface Description
5.3 User Accessible Interfaces
NXGPro+ Control Manual
70 Operating Manual, A5E50491925A