Lenze 8400 - Manual (Page 1262)

18 Function library
18.1 Function blocks | L_DFRFG_1
1262
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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The acceleration calculated from the acceleration/deceleration time ( C01076/1 ) is a maximum
acceleration that will not be reached if the input speed is reduced and the FB has to reach its target
with a too high offset.
[18-34] Example 2: With offset selection and reduced input speed
 Difference between setpoint angle and actual angle (ϕ
DIFF
)
 Offset [inc]
 Reduced input speed
t
0
= touch probe event
t
1
= reaching synchronicity at original input speed
t
2
= synchronicity reached
j
t
TRUE
FALSE
bSync
t
v
t
j
SET
j
ACT
Œ
t
0
t
2

t
1
nIn_v
Ž

Note!
With a very low input speed, the acceleration can also get negative which causes the
slave drive to change its direction of rotation.
In order to prevent a change of the direction of rotation,
C01069/1 serves to select a
permanent direction of rotation.