Encoderless Actual Value Sensing - Siemens SINAMICS G120 Function Manual

4.6.2.4

Encoderless actual value sensing

● If you only use STO, then the settings in this screen form have no significance. In all
● Close the screen form.
● Close the screen form for forced dormant error detection.
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB
other cases, set the following:
– ① Delay time, actual value sensing:
In most cases you do not have to change this value. If you switch on the motor with
the safety functions active (SLS, SDI or SSM) and the inverter responds when
switching on with a safety fault message, increase this value in the range 50 % ...
100% of the motor excitation build-up time (p0346).
– ② Minimum current actual value sensing:
Leave this value at the factory setting (10 %).
– ③ Voltage tolerance, acceleration:
In most cases you do not have to change this parameter. During acceleration with
very short ramp-up and ramp-down times, if the inverter responds with a safety
function fault, increase this value step-by-step by approx. 10%.
Commissioning
4.6 Extended Safety
137