Installing The Encoder Interface; Table 1-1 Encoder Interface Terminals - Siemens SINAMICS CU240S DP-F Operating Instructions Manual

Installing/Mounting
1.1 Fitting the CU to the PM
1.3

Installing the Encoder Interface

Preparation
• The Encoder unit has been fitted to the motor as described by the Installation Instructions
• The SINAMICS G120 inverter has been powered-down.
Screening
To ensure the correct functioning of the encoder the guidelines listed below should be
followed:
• Only twisted-pair screened cable should be used to connect the encoder to the Encoder
• If the encoder cable has a screen/earth/ground conductor, this should be terminated to
• Signals cables must not be installed close to power cables.
Connections
The terminal descriptions and functions are shown in the table below.
Table 1-1
Terminal
70
71
72
73
74
75
33
28
Typical encoder wiring
The figure below shows a typical pulse encoder cable and how the encoder connections
relate to the encoder terminals.
Note
Optimum signal clarity is achieved when differential wiring is used between the encoder and
encoder module. This is especially useful when situated in a noisy environment or with long
cables - however, the module will function correctly both with single ended or differential
wiring and as such can tolerate a wire break when differential wiring is used. If the module
loses the complete signal on either A or B lines, the inverter will trip with F0090.
1-10
supplied with the Encoder unit.
Interface.
the backplane of the inverter or the cabinet housing.
Encoder interface terminals
ENC AP
ENC AN
ENC BP
ENC BN
ENC ZP
ENC ZN
ENC+ Supply
U0V
Function
Channel A non-inverting input
Channel A inverting input
Channel B non-inverting input
Channel B inverting input
Channel 0 (zero) non-inverting input
Channel 0 (zero) inverting input
5 V or 24 V power supply for encoder, configured by DIP switch
Isolated encoder supply reference
Operating Instructions (Compact), 04/2006, A5E00766042B AA
Control Units CU240S