Lenze E94AYAE SM301 - Manual (Page 64)

Safety engineering
Safety functions
Ramp monitoring SS1/SS2
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64 EDS94AYAE EN 7.0
1.3.6 Ramp monitoring SS1/SS2
1.3.6.1 Description
From SM301 V1.4 onwards, the deceleration ramp for the stop functions SS1 and SS2 can
be parameterised and monitored. If the parameterised ramp is not exceeded, the state
changes to the parameterised stop function STO or SOS.
The monitoring of the deceleration process serves to achieve a higher degree of safety.
Ramp monitoring becomes most critical when delay times are caused by high moments of
inertia
ƒ Braking the drive to standstill and holding the position must still be executed by the
application!
ƒ A safe speed evaluation is the precondition for a safe ramp monitoring, i.e. an
encoder system must be parameterised in the safety module.
ƒ When ramp monitoring is activated, the starting value of the ramp and the S−ramp
time must be defined in percent.
– The starting value refers to the current speed value at the time of the SS1/SS2
request.
– The starting time of the deceleration ramp is delayed via the S−ramp time in order
to consider a possible S−ramp smoothing.
If the current speed exceeds the parameterised deceleration ramp within the stopping
time or before reaching the tolerance window (n=0), an error message is caused and an
error stop is initiated.
ƒ The power supply of the motor is immediately safely interrupted (STO). The motor
cannot create a torque and thus no dangerous movements of the drive can occur.