Safely Limited Speed Without Encoder - Siemens Sinamics S120 Function Manual

4.2.9.2

Safely Limited Speed without encoder

Functions
2 different encoderless Safely Limited Speed monitoring functions can be set with parameter
p9506:
● p9506 = 3: Safe monitoring of acceleration (SAM) / delay time
The function is identical to "Safely Limited Speed with encoder" which was described in
the previous section.
● p9506 = 1: Safe brake ramp monitoring (SBR)
Not e
Def aults
• For commissioning, also pay attention to the description in Chapter "Default settings for
commissioning Safety Integrated functions without encoder (Page 232)."
• Information about setting the SBR monitoring function can be found in Chapter "Safe
Brake Ramp (SBR) (Page 144)".
M onitoring the brake ramp
● If the speed setpoint limitation (r9733) was connected to the setpoint channel
(p1051/p1052) and then SLS was selected – or if you change over to a lower SLS level –
the motor is decelerated from the actual speed to below the value defined with r9733
along the OFF3 ramp. In this case, the drive may no longer follow the setpoint of the
higher-level motion controller.
● Parameter p9582 is used to set the delay time for the braking ramp monitoring.
● Monitoring of the brake ramp is activated once the delay time in p9582 has elapsed. If the
actual speed of the drive violates the brake ramp (SBR) during braking, safety message
C01706 is output and the drive is stopped with STOP A.
● The newly selected SLS limit value is also taken over as the new limit speed, if either
– The SBR ramp has reached the new SLS limit value, or
– The actual speed of the drive was below the new SLS limit value for at least the time
● The "Safely Limited Speed without encoder" function then monitors whether the actual
speed remains below the newly selected SLS limit value.
● The parameterized stop response (p9563[x]) is triggered if the SLS limit value is
exceeded.
Configuring the limits
● The speed limits for Safely Limited Speed without encoder are configured in exactly the
same way as described for Safely Limited Speed with encoder.
● Only STOP A and STOP B may be configured as stop responses for "Safely Limited
Speed" (SLS) without encoder.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
set in p9582.
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
103