Comfort Ramp-Function Generator - Siemens SIMOVERT FC Series Operating Instructions Manual

02.99
Limitation
A special characteristic of the limitation function is that the lower limitation can also be set to positive values and
the upper limitation to negative values (see H354 and H356). A limit set in this way also acts as a lower limit
(minimum value) for the output signal of the technology controller in the opposite sign direction.
Warning! If the positive output limitation of the technology controller is set to a negative value or the negative
output limitation set to a positive value, then the motor may accelerate in an uncontrolled manner in
some operating modes and configurations, e.g. if there is no motor counter-torque and the technology
controller output is connected to the torque supplementary setpoint of the basic unit.
D component in actual-value channel or setpoint/actual value deviation channel
The derivative-action time of the D component has the following setting ranges:
H333 = 0: Range of effective derivative-action time Tv: 0.000 to 30.000 sec
H333 = 1: Range of effective derivative-action time Tv: 30 to 30000 sec (= approx. 8.3 hours !)
The setting H333 = 1 may only be used when derivative-action times of > 30 sec actually need to be
set. (The settings H333 = 1 and H332 = 0.001 sec would in theory also produce an effective
derivative-action time Tv of 1 sec. However, the internal calculations for these settings are extremely
inaccurate.)
As a basis for selecting the derivative-action time, the maximum possible rate of rise which can occur at the input
of the D-action element must be calculated. The derivative-action time should then be set shorter than the period
of time required by the input signal to change from 0 to 100% at the calculated maximum rate of rise.
3.13

Comfort ramp-function generator

See also sheet 22 of block diagram and parameter list (Chapter 4, parameters H360-H394)
Note: The ramp-function generator will only operate if the following conditions are fulfilled:
- Enable ramp-function generator = 1(e.g. by setting H368 = 1)
- Disable ramp-function generator = 0 (e.g. by setting H362 = 0)
Definitions
Ramp-up = Acceleration from low positive to high positive speeds (e.g. 10% to 90%) or from low negative
to high negative speeds (e.g. -10% to -90%)
Ramp-down = Braking from high positive to low positive speeds (e.g. 90% to 10%) or from high negative to
low negative speeds (e.g. -90% to -10%)
On transition from negative to positive speeds e.g. -10% to +50%:
from -10% to 0 = ramp-down and
from 0 to +50% = ramp-up and vice versa
Ramp-up time is the time required by the ramp-function generator to pass through the 100% at the ramp-
generator output with a lower and upper transition rounding setting of 0 and a step change in
the input quantity from 0 to 100%, or from 0 to -100%. With less abrupt changes at the input,
the rate of rise at the output is constant.
Ramp-down time is the time required by the ramp-generator to pass through 100% at the ramp-generator output
with a lower and upper transition rounding setting of 0 and a step change in the input quantity
of 100% to 0 or of -100% to 0. With less abrupt changes at the input, the rate of rise at the
output is constant.
Siemens AG 6SE7087-6CX84-0BB1
T100 Technology Board Manual for Software Module MS100 "Multi-Purpose Drive"
Function Descriptions
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