Time Interval For Stepping Rate Increase And Rate; Decrease (Ti) - Siemens SIMATIC S5 Manual

Driving Stepper Motors with the IP 267
The following formula applies:
f (Hz) =
ss
f = Start/stop rate
ss
BV = Base value for the frequency
SS = Multiplier for the start/stop rate
R = Reduction factor (1 oder 0.1) for the start/stop rate (f
the stepping rate (f
The reduction factor R is transferred with the positioning job.
Starting from the start/stop rate f
amount after each time interval (TI), until the preset stepping rate is reached. The
absolute value for the frequency increase in the stepping rate is linked to the
preset base value (BV) for the frequencies.
The number of the pulses output in the acceleration range is acquired by an
internal counter and used as a position setting for the deceleration range. The
stepping rate is modified by the same amount in the deceleration range as in the
acceleration range. This generates a symmetrical velocity profile with equal
acceleration and deceleration curves (
tained when the traversing motion is interrupted, e.g. by limit switches (I+, I -),
the STOP switch or reference point switch. Only by the emergency limit switch
(PD) is a traversing motion immediately interrupted, i.e. without deceleration
ramp ( 3.4).
2.2.4 Time Interval for Stepping Rate Increase and Rate Decrease
(TI)
Starting from the start/stop rate, the acceleration rate is incremented by a
quarter of the base value (BV) after each time interval (TI), until the stepping rate
is reached. In the deceleration range, the frequency is reduced by the same
amount after each time interval. You can determine the time interval TI with bits
TI 0 to TI 7 and the value set is multiplied by a basic time of 32 µs ( 4.1.4).
2-4
BV (Hz) · SS · R
)
A
, the frequency is incremented by a certain
ss
Figure 2-1.). This profile is also main-
IP 267
) and
ss
EWA 4NEB 812 6061-02a