Siemens SINAMICS G220 - Safe Motor Temperature (SMT)

Description of function
The higher-level control receives the value for the required limitation of the speed setpoint from
the Safety Info Channel (SIC) in telegram 700.
With SDI active, the converter sends the required setpoint limit r9733 in the S_V_LIMIT_B
signal of telegram 700.
The converter calculates r9733 as follows:
• For SDI negative (SDI-): r9733[0] = 0
• For SDI positive (SDI+): r9733[1] = 0
14.12.6 Safe Motor Temperature (SMT)
Overview
5
U
450
Figure14-237 Overview SMT
Safe Motor Temperature (SMT) prevents the motor temperature from exceeding a speci󹪝ed
limit. SMT is used to protect against overtemperature of a motor that is used in a potentially
explosive atmosphere.
SMT is a safety function in accordance with IEC61800-5-2.
Requirement
Option module OM-SMT is connected to the converter.
Option module OM-SMT is con󹪝gured with a commissioning tool.
A permissible PTC thermistor is connected at the input of the OM_SMT for the
overtemperature shutdown.
Functions
14.12Safety Integrated
SINAMICS G220 converter
678 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB