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Digital controller RK 4004
..9. osc. cycl. time
Cycle-dependent:
The cycle time (oscillation time t
c
) for an oscillation period is esta-
blished here. The longer the period, the slower the actuator oscillates.
Entry may be directly in the parameter or via a command station with
oscillation function.
Path-dependent:
In path-dependent oscillation the oscillation period is determined by
path-dependent, external pulses. The oscillation period is divided up
into n-sections. The maximum number of pulses must not exceed 20
pulses per second.
The number of pulses to be set may be calculated as follows:
1. Establish path length per oscillation period
Oscillation time t
c
n-sections
web length s
s
s = web length per oscillation period
f
c max
=
V
max
s
x 60
f
c max
= maximum oscillation frequency (1/s)
V
max
= maximum web speed (m/min)
s
= web length per oscillation period (m)
n
=
f
e max
f
c max
f
e max
= maximum input frequency 20 Hz
f
c max
= oscillation frequency (Hz)
n
= no. of pulses per period
f
a max
=
n
s
f
a max
= maximum pulse generator output frequency (Hz)
s
= web length per oscillation period (m)
n
= no. of pulses per period
2. Establish maximum oscillation frequency
3. Establish no. of pulses
The maximum number of pulses per period is limited by the maxi-
mum input frequency of f
e max
20 Hz.
The no. of pulses
n
is entered in the parameter.
Dimensioning of the external pulse generator may be determined as
follows:
The external pulse generator must emit the calculated no. of pulses
f
a max
at maximum web speed.
