Functions 09.2008
6SE7087-6QX70 (Version AK) Siemens AG
7-10 Compendium Motion Control SIMOVERT MASTERDRIVES
7.2 Technology functions
It is the user's responsibility to make allowance for the safety-relevant
requirements when using the technology functions as free blocks and to
interlock them.
7.2.1 Comfort ramp-function generator
♦ The adaptation function has no effect with ramp-up/ramp-down
times in ‘min’ and ‘h’.
♦ The resolution is 11 bits = 0.2 %.
♦ The adaptation function only has an effect for ramp-up/ramp-down
times, not for rounding off.
♦ With an adaptation factor of 0 %, the rounding time at least has an
effect.
♦ The rounding function has no effect with ramp-up/ramp-down times
in ‘min’ and ‘h’.
♦ The rounding function also has an effect during zero passage.
♦ There is no overshooting over zero.
♦ The rounding function can be altered during ramp-up/ramp-down.
♦ Initial rounding is always limited to at least 10 % of the final
rounding.
The following calculating times apply to the comfort ramp-function
generator:
♦ Without rounding:
65 to 79 µsec
♦ With initial rounding = final rounding:
96 to 105 µsec
♦ With initial rounding <> final rounding:
105 to 114 µsec
♦ With initial rounding <> final rounding and adaptation:
123 to 132 µsec
The ratio of the sampling time to the ramp-up, ramp-down and rounding
times is as follows:
♦ With 1 : 100, a very good result
♦ Example.: When Tsa : Tround. = 1 : 10, the ramp-up/ramp-down
time can be false by a maximum of 10 %
♦ Max. sampling time: 200.00 msec
The priorities of the commands of the comfort ramp-function generator
are as follows:
1. Enable
2. Quick stop
3. Set
4. Ramp down to zero
5. Stop
DANGER
Adaptation
Rounding
Calculating time
Sampling time
Priorities
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