Commissioning – Lenze 8240 frequency inverters User Manual
Page 36
Commissioning
5-4
UOOu_^MTMO
L
5.3.2
Adjustment of acceleration and deceleration times (T
ir
, T
if
)
Code
Name
Possible settings
IMPORTANT
Lenze
Selection
Info
C012 Acceleration time
5.0
0.0
{0.1s}
999.0 T
ir
C013 Deceleration time
5.0
0.0
{0.1s}
999.0 T
if
Function
The accleration and deceleration times determine the time required by the drive to follow a setpoint
change.
Adjustment
D
The acceleration and deceleration times refer to a change of the field frequency from 0 Hz to the
max. field frequency set under C011.
D
Calculate the times T
ir
and T
if
, which must be set under C012 and C013.
- t
ir
and t
if
are the times required for the change between f
d1
and f
d2
:
q
бк
= н
бк
⋅
С
Зг~с
С
ЗO
− С
ЗN
q
бС
= н
бС
⋅
С
Зг~с
С
ЗO
− С
ЗN
Important
Under unfavourable operating conditions, too short acceleration and deceleration times can lead to
the deactivation of the controller under overload with the indication of TRIP OC5. In these events,
the acceleration and deceleration times should be set short enough so that the drive can follow the
speed profile without reaching I
max
of the controller.
f /Hz
d
f
dmax
d2
f
fd1
0
tir
tif
Tir
Tif
t
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