Ramp Monitoring - Lenze i950 Commissioning Manual

19.3

Ramp monitoring

In addition, the deceleration ramp can be parameterised and monitored for the stop functions
SS1 and SS2. If the parameterised ramp is not exceeded, it is then switched to the parameter-
ised stop function STO or SOS.
Functional description
Monitoring the deceleration process guarantees a higher safety level.
The application leads the drive to a standstill.
•
If the ramp monitoring is active, the starting value of the ramp and the smoothing time
•
must be defined as percentage value.
If the speed exceeds the deceleration ramp parameterised within the stopping time or before
the tolerance window (n = 0) is reached, an error message is triggered and an error stop is
initiated.
Safe ramp monitoring for SS1-r and SS2-r
C
SS1
n
❶
❸
❹
0
❷
1. 0x2894:001
40x2894:001
SS1, SS2: Stopping time
2.
0x287B:001
40x287B:001
Tolerance window (n=0)
3. 0x2894:003
40x2894:003
SS1, SS2: Ramp smoothing time
4.
0x2894:005
40x2894:005
SS1, SS2: start offset ramp
Condition
Safe speed evaluation via the parameterised encoder system.
•
Ramp monitoring is activated.
•
The parameterised monitoring ramp considers the parameters of the decelera-
tion ramp in the application.
0...30 % of the actual speed are added to the actual speed as start offset. The
sum is used as constant starting value.
Alternative: An absolute value can be parameterised as start offset. The value is
set in the following parameter. 0x2894:006 40x2894:006.
The following parameter defines whether the relative or absolute offset value is
used. 0x2894:004
The Lenze setting of the start offset considers the tolerance window (n=0) as
offset. 0x2894:005
The monitoring ramp starts after an internal deceleration time has elapsed. The
internal deceleration time depends on "SS1, SS2: smoothing time" and "SS1,
SS2: stopping time".
STO STO
t
40x2894:005
40x2894:004
40x2894:005
Safety functions
D
SS2
n
❶
❸
❹
STO SOS
0
❷
Ramp monitoring
t
377