4-9
4-2 Function Mode
4
Functions
* To switch to 2nd/3rd acceleration time 1 or 2nd/3rd deceleration time 1, allocate 08 (SET)/17 (SET3) to the
desired multi-function input and then turn it on.
•The set time here indicates the acceleration/deceleration time from 0 Hz to the maximum
frequency.
•When the LAD cancel (LAC) function is selected in the multi-function input selection and the signal
is turned on, the acceleration/deceleration time is ignored, and the output frequency
instantaneously follows the reference frequency.
•To switch between the 1st/2nd/3rd acceleration times or between the 1st/2nd/3rd deceleration
times, allocate 08 (SET)/17 (SET3) to the desired multi-function input (refer to "Multi-function Input
Selection" (page 4-77)), and use the SET/SET3.
•You can set the acceleration/deceleration time via (1) the Digital Operator, (2) optional board 1, or
(3) optional board 2.
•Even if a short acceleration/deceleration time is set, the actual time cannot be shorter than the
minimum acceleration/deceleration time that is determined by the mechanical inertia moment and
the motor torque. If you set a time shorter than the minimum time, an overcurrent/overvoltage trip
may occur.
For short-time deceleration, use a braking unit (optional).
P031
Acceleration/deceleration
time input type
00: Input via the Digital Operator
01: Input via option 1
02: Input via option 2
00
Related functions A004, A204, A304, P031, C001 to C008
Parameter No. Function name Data Default setting Unit
Output frequency
Max. frequency
A004/A204/A304
Output frequency set value
Actual
acceleration
time
Actual
deceleration
time
F002/F202/F302
F003/F203/F303
LS
MML
S
TT
NJJ
T
9.55
Acceleration Time TS
=
(
+
)
()
Deceleration Time TB
LB
MML
B
TT
NJJ
T
9.55
=
(
+
)
()
+
J
L: Inertia moment of the load converted to the motor shaft [kg·m
2
]
JM: Inertia moment of the motor [kg·m
2
]
NM: Motor rotation speed [r/min]
T
S: Max. acceleration torque with the Inverter driving [N·m]
T
B: Max. deceleration torque with the Inverter driving [N·m]
T
L: Required driving torque [N·m]
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