Siemens SINAMICS G120 Operating Instructions Manual page 116

Functions
5.7 Closed-loop control
Use a shielded cable to connect the speed encoder. The shield must not be interrupted by
terminal points between the encoder and inverter.
Setting the encoder voltage
The encoder voltage is set using the DIP switches at the front of the CU. If you use either a
BOP or a PC Connection Kit, you must remove this module in order to be able to access the
switches.
Table 5- 37
Encoder type
No encoder
TTL encoder **
Supply voltage: 5 V
HTL encoder
Supply voltage: 24 V
*) DIP switches 1 and 2 are of no significance when setting the encoder voltage
**) When using standard TTL encoders, it is recommended that DIP switches 5, 6 and 7 are set to
OFF. If TTL encoders with a differential circuit are being used, and if a long cable is required (more
than 50 meters), then DIP switches 5, 6, and 7 can be set to ON.
If DIP switch 3 is set to ON (24 V), a TTL encoder (voltage level 5 V) must not be
connected to the inverter.
116
CAUTION
Encoder settings
WARNING
Setting the DIP switches* at the front of the CU
2 3 4
2 3 4
2 3 4
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
5 6 7
5 6 7
5 6 7