Siemens SINAMICS G120 Function Manual page 24

Description
3.5 Restrictions when using safety functions
Critical applications
For safety functions that have not been enabled, you can use the following applications
without any restrictions.
For active safety functions, several applications can result in errors in the safety-related
actual value sensing. For active or enabled safety functions, faults and errors in the safety-
related actual value sensing initiate a stop response: Messages C01711, C30711 with
default values 1040 ff.
The stop response does not result in an unsafe drive state, but in a lower drive availability.
Critical application
Motor data identification during
commissioning
Setpoint change as step function
Reversing the speed
Load change as step function
Continuous operation at speeds <
5 % of the rated speed
Switching-on the inverter with the
motor rotating ("flying restart"
function)
Operating an inverter at the current
limit
Braking a motor using the "DC
braking" or "Compound braking"
functions
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Remedy
Only commission the safety functions after the motor data
identification has been completed.
Set the ramp-function generator times to values > 0.5 s.
If you are using an inverter with position control, then you must
set the position controller and the travel profile so that there is
absolutely no overshoot in the speed/velocity characteristic.
Within 1 s, only one acceleration and one braking ramp are
permitted. The cycle 0 → n
long.
Do not use the safety functions.
Avoid using the "flying restart" function when a safety function is
active.
Temporarily deactivate the safety function until the "flying
restart" function has been successfully completed.
It is not permissible that you use the "flying restart" function if
you are using the SSM function. It is not possible to deactivate
SSM using a control signal.
Select and dimension the drive so that the inverter current limit
does not respond. After commissioning, check that the inverter
does not reach its current or torque limits – even at full load.
Avoid using the "DC braking" or "Compound braking" functions
when a safety function is active.
If you require one of these two braking functions, then in the risk
assessment, you must carefully check as to whether you may
deactivate the safety function while braking. If yes, then
deactivate the safety function until braking has been completed.
It is not permissible that you use the braking functions if you are
using the SSM function. It is not possible to deactivate SSM
using a control signal.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
→ -n → 0 must be at least 2 s
set set
Function Manual, 04/2014, FW V4.7, A5E34261271B AA