Safety engineering
Safety functions
Safe maximum speed
1
68
EDS94AYAE EN 6.0
1.3.8 Safe maximum speed
1.3.8.1 Description
Safe Maximum Speed / SMS
This function monitors the maximum motor speed. If a value > 0 is indicated (C15320), the
function is activated.
If the maximum speed is exceeded, a error stop is caused. STO, SS1 or SS2 (C15321) can be
adjusted.
t
n
0
1
SM301DIA_SMS
Speed characteristic n of the motor
t Time axis
Codes
Parameter: Name: Data type: Index:
C15320 SMS: Max. speed Nmax
INTEGER_16 9255
d
= 2427
h
Selection of the maximum speed and activation of the SMS function
Setting range
(min. value | unit | max. value) Information
0 rpm 16000 Lenze: 1, deactivate: 0
þ Read access Write access o Controller inhibit o PLC-STOP o No transfer
C15321 SMS: Response (n>Nmax)
UNSIGNED_8 9254
d
= 2426
h
Response to the exceeding of the set maximum speed
Selection list
(Lenze setting bold) Information
0 STO Safe torque off
1 SS1 Safe stop 1
2 SS2 Safe stop 2
þ Read access Write access o Controller inhibit o PLC-STOP o No transfer
C15350 SLS, SMS: Max. response time
UNSIGNED_16 9225
d
= 2409
h
Maximum time after an exceeded speed has been detected, after which the speed must be below the limit
again.
Setting range
(min. value | unit | max. value) Information
0 MS 30000 Lenze: 0, increment: 2 ms
þ Read access Write access o Controller inhibit o PLC-STOP o No transfer
1.3.8.2 Activation
The function is activated or deactivated via the parameter value. A value > 0 activates the
function, a value = 0 deactivates the function.
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