Lenze E94AYAE SM301 - Manual (Page 48)

3 Safe configuration
3.9 Safety functions
48
Lenze · SM301 safety module · Parameter setting & configuration · DMS 2.3 EN · 11/2013 · TD05
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3.9.1.7 Ramp monitoring (SS1/SS2)
From SM301 V1.4
Ramp monitoring (SS1/SS2)
Description
The SS1 and SS2 stop functions monitor whether the drive has reached the set tolerance
window (n=0) within the stopping time parameterised.
From SM301 V1.4 additionally the deceleration ramp for the SS1 and SS2 stop functions can be
parameterised and monitored.
By monitoring the deceleration process, safety can be increased. The longer the deceleration
times due to high moments of inertia are, the more important is ramp monitoring, in order to
still be able to ensure acceptable safety margins.

• The application must ensure that the drive is braked to standstill and the position is
maintained!
• The safe speed evaluation is a precondition for safe ramp monitoring, i. e. an encoder system
has to be parameterised in the safety module.  Safe speed measurement and position
detection ( 31)
• If ramp monitoring is activated, the starting value of the ramp and the S-ramp time have to
be preselected as a percentage value.
• The starting value refers to the current speed value at the time of the SS1/SS2 request.
• Via the S-ramp time, the starting time of the deceleration ramp is delayed to take a
potential S-ramp smoothing into consideration.
Function
Safe ramp monitoring for SS1 () and SS2 ()
Parameter  C15305 SS1, SS2: Stopping time
 C15310 Speed window (n=0)
C15315 SS1, SS2: Ramp monitoring
 C15316 SS1, SS2: Ramp S-ramp time
 C15317 SS1, SS2: Ramp offset start
Activation How to activate the function:
• The ramp monitoring function has to be activated via parameter C15315 .
• If the SS1/SS2 stop function is requested, a monitoring ramp is calculated and is layed on the
current speed characteristic.
 • The parameterisation of the monitoring ramp in the safety module has to take the
parameters of the deceleration ramp from the application into consideration.
• On the basis of the actual speed, a parameterisable percentage proportion (0 ... 30 %) is
added to the actual speed as start offset and is considered as a constant starting value.
• In the Lenze setting of the start offset ( C15317 ) the tolerance window (n=0) is considered
as the offset.
• The monitoring ramp is only started after an internal deceleration time has elapsed, which is
generated depending on the "SS1, SS2: S-ramp time" and "SS1, SS2: Stopping
time"parameters:
• The "SS1, SS2: S-ramp time" parameter is scaled linearly from 10 ... 30 % to the stopping
time:
0 % S-ramp time ≡ 10 % deceleration
100 % S-ramp time ≡ 30 % deceleration
• In the Lenze setting of the S-ramp time, the deceleration time is 10 % of the stopping time
set.
• In the SM301 the same value as in the standard device can be set for the S-ramp time.
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SS1
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SS2
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