Sensor Module Cabinet 20 (Smc20); Description; Safety Information - Siemens SINAMICS S120 Equipment Manual

Supplementary system components and encoder system integration

7.4 Sensor Module Cabinet 20 (SMC20)

7.4 Sensor Module Cabinet 20 (SMC20)
7.4
7.4.1

Description

The Sensor Module Cabinet-Mounted 20 (SMC20) evaluates encoder signals and transmits
the speed, actual position value, rotor position and, if necessary, the motor temperature and
reference point via DRIVE-CLiQ to the Control Unit.
Encoders that can be connected are incremental SIN/COS (1 Vpp) and absolute encoders
with EnDat and SSI (with 5 V operating voltage).
The maximum sensor cable length is 100 m.
The component is snapped on to a mounting rail according to DIN 50022.
The SMC20 can be operated from Firmware 2.2 onwards
7.4.2

Safety Information

Caution
The cooling clearances of 50 mm above and below the components must be observed.
Notice
Only one measuring system can be connected to each Sensor Module.
Note
There may be no electrical connection between the measuring system housing and the
measuring system electronics (this requirement is fulfilled for most encoder systems). If this
is not carefully observed, then under certain circumstances the system will not be able to
reach the required noise immunity (there is then a danger of equalization currents flowing
through the electronics ground).
Caution
Connecting cables to temperature sensors must always be installed with shielding. The
cable shield must be connected to the chassis potential at both ends over a large surface
area. Temperature sensor cables that are routed together with the motor cable must be
twisted in pairs and shielded separately.
7-30
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0