Setting Ss1 - Siemens SINAMICS G120 Function Manual

Commissioning
4.6 Extended Safety
4.6.2.7

Setting SS1

The appearance of the SS1 screen form depends on which mode you set when selecting the
safety functions.
SS1 with braking ramp monitoring
The function is described in Section: Braking ramp monitoring (Page 22).
● Set the following in this screen form:
140
①
– Shutdown speed (standstill monitoring)
②
– Delay time:
If the OFF3 ramp-down time (p1135) is less than 10 seconds, leave the delay time set
to the factory setting. If SS1 switches to the fault status during the function test,
increase this value until the motor brakes normally.
If the OFF3 ramp-down time is set to several minutes, you must extend the delay time
to a number of seconds in order to avoid any unwanted interruptions caused by SS1.
③
– Monitoring time
Monitoring time ≥ OFF3 ramp-down time (p1135).
If the monitoring time and OFF3 ramp-down time are identical, the deceleration ramp
and monitoring curve run parallel to each other. Longer monitoring times result in
flatter monitoring curves.
④
– Reference speed:
Reference speed = rated speed of the motor (p1082) × gear ratio
Gear ratio = load / motor revolutions
Example: p1082 = 1500 rpm, gear ratio = 1 / 3
⇒ reference speed = 500 rpm
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB