Siemens SINAMICS G120 Function Manual page 127

● If you only use STO, then the settings in this screen form have no significance. In all
Without gear
Gear with speed ratio
Load/motor = L/M
Example: Gear with speed ratio Load/motor = 1/3 1
Table 4- 2
Motor speed under no-load
conditions at 50 Hz
3000 rpm
1500 rpm
1000 rpm
750 rpm
● Close the screen for the gear ratio.
● 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 Actual value tolerance:
In most cases you do not have to change this value. For the "flying restart" function, if
the inverter responds with message C01711 or C30711, increase this value step-by-
step until the message to longer occurs.
Note: If you increase this value, the speed monitoring of the inverter becomes less
sensitive to limit violations.
– ② ③ Gear ratio:
Enter your machine's data in accordance with the following table.
Determine the number of pole pairs (r0313)
②
Number of load
revolutions
1
L
Motor speed under no-load
conditions at 60 Hz
3600 rpm
1800 rpm
1200 rpm
900 rpm
Commissioning
4.6 Extended Safety
③
Number of motor
revolutions
Number of pole pairs
M × number of pole
pairs
3 × number of pole
pairs
Number of pole pairs
1
2
3
4
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