Lenze E94AYAE SM301 - Manual (Page 58)

3 Safe configuration
3.9 Safety functions
58
Lenze · SM301 safety module · Parameter setting & configuration · DMS 2.3 EN · 11/2013 · TD05
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3.9.5 Safe direction (SDI)
From SM301 V1.3
Safe Direction / SDI
Description
This function allows you to monitor a direction. The safety module monitors whether the drive
reaches the set direction in the parameterised delay time and, after the delay time has elapsed,
indicates that the direction is monitored. In the monitoring phase, a tolerance threshold
ensures that the drive does not leave the permissible direction.

• The direction must be observed by the application!
• For operation within the limit values the "SDIpos/SDIneg monitored" status is set ( C15000 ).
• The status can be assigned to the safe output.  Safe output ( 37)
• The status can also be reported via the safety bus.
• The function must not be parameterised if "No encoder system" is set. The plausibility check
rejects such implausible settings until they have been parameterised correctly.
Preconditions The safe directions SDIpos and SDIneg are available from SM301 V1.3.
Function
Parameter C15340 SDI: Normal operation monitoring
 C15341 SDI: Delay time
 C15342 SDI: Tolerance threshold
 C15343 SDI: Error response

If the SDI delay time ( C15341 ) is parameterised higher than zero, either the "SDIxxx monitored"
response must be evaluated (safety bus or safe output) or the risk analysis must show that the
delay does not represent a danger. This must e.g. be considered for the calculation of the safety
distance.
Activation How to activate the function:
• A data telegram with a corresponding content is sent to the controller via the safety bus.
 Safety bus ( 59)
• "OFF state" at a safe input which has been assigned to the function by parameter setting.
 Safe inputs ( 34)
• For normal operation, the safe direction can be fixedly set via a safe parameter.
• The safe direction can be combined with the safely-limited speed SLS .
Error behaviour If the SDI tolerance threshold for the set SDIpos/SDIneg direction is exceeded after the SDI delay
time has elapsed an error message is activated and an error stop with the function set in the
"SDI: Error response" parameter ( STO , SS1 or SS2 ) is triggered.
t
0
SDIpos
SDIpos observed Œ

STO/SS1/SS2
Ž
-n
t
0
SDIneg
SDIneg observed Œ

+n
-n
+n