92
Setting of acceleration/deceleration time and acceleration/ deceleration pattern
(2) Deceleration time setting
(Pr. 8, Pr. 20)
Use
Pr. 8
Deceleration time
to set the deceleration time required to reach 0Hz from
Pr. 20
Acceleration/deceleration reference
frequency
.
Set the deceleration time according to the following expression.
(3) Set two kinds of acceleration/deceleration times (RT signal,
Pr. 44, Pr. 45
)
Pr. 44
and
Pr. 45
are valid when the RT signal is on.
When "9999" is set to
Pr. 45
, the deceleration time becomes equal to the acceleration time
(Pr. 44)
.
For the RT signal, set "3" in any of
Pr. 178 to Pr. 182 (input terminal function selection)
to assign the function.
Deceleration
time setting
=
Pr. 20
×
Deceleration time from maximum operating frequency to stop
Maximum operating frequency -
Pr. 10
Example)When the frequency can be decelerated down to the maximum
operating frequency of 40Hz in 10s with 120Hz set in
Pr. 20
and 3Hz set
in
Pr. 10
Pr. 8
=
120Hz
×
10s
32.4s
40Hz-3Hz
NOTE
When the acceleration/deceleration pattern is S-pattern acceleration/deceleration A
(refer to page 94)
, the acceleration/
deceleration time is the time required to reach
Pr. 3 Base frequency
.
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
Changing terminal assignment may affect the other functions. Make setting after confirming the function of each
terminal.
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid.
If the
Pr. 20
setting is changed, the
Pr. 125 and Pr. 126 (frequency setting signal gain frequency)
settings do not change.
Set
Pr. 125 and Pr. 126
to adjust the gains.
When the
Pr. 7, Pr. 8, Pr. 44 and Pr. 45
settings are 0.03s or less, the acceleration/deceleration time is 0.04s. At that time, set
Pr.
20
to "120Hz" or less.
Any value can be set to the acceleration/deceleration time but the actual motor acceleration/deceleration time cannot be made shorter
than the shortest acceleration/deceleration time determined by the mecanical system J (moment of inertia) and motor torque.
Parameters referred to
Pr. 3 Base frequency
Pr. 10 DC injection brake operation frequency
Pr. 29 Acceleration/deceleration pattern selection
Pr. 125, Pr. 126 (frequency setting gain frequency)
Pr. 178 to Pr. 182 (input terminal function selection)
Guideline for acceleration/deceleration time at the
Pr. 3 Base frequency
of 50Hz (0Hz to set frequency)
t=
4
×
T
×
f
2
+
5
T
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
9
(Pr. 3)
2
9
Frequency setting (Hz)
50
120
200
400
Acceleration/
deceleration time (s)
5
5
16
38
145
15
15
47
115
429
Содержание FR-D700 Series
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