Lenze E94AYAE SM301 - Manual (Page 53)

Lenze · SM301 safety module · Parameter setting & configuration · DMS 2.3 EN · 11/2013 · TD05
53
3 Safe configuration
3.9 Safety functions
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3.9.2.3 Error analysis for the functions SMS and SLS
Error analysis
The speed values are evaluated and checked for plausibility in a cycle of 2 ms.
The following illustration shows the process from the moment the error occurred.
 Occurrence of the error event
• The speed exceeds the limit value parameterised for SMS or SLS .
 Detection of the error event
• After the internal response time t
C
of max. one evaluation cycle has elapsed, the
parameterised function ( STO , SS1 or SS2 ) is started as the error response.
• With the parameterised function SS1 or SS2 , the stopping time t
S
set for SS1 / SS2 is
added to the internal response time, until STO is started in the event of an error.
 Response instance in the case of continuous exceedance
• By parameterising the maximum response time t
R
( C15350 ), continuous exceedance
of the limit values can be avoided.
• If the speed is outside the limit values even after the response time t
R
has elapsed, STO
is started immediately.

In the event of an error, the set limited speed will be exceeded. In order to evaluate the risk for
the system, you must calculate the amount of the maximum exceedance.
The following must be taken into account:
• Internal response time
• Application-specific response time
• Application-specific maximum acceleration
t
C
t
R
t
S
t
n
STO
STO/SS1/SS2
01 2