Mitsubishi Electric FR-A700 Technical Manual page 202

(1) Acceleration time [Pr. 7]
Calculate the period of time required for linear
acceleration from a stop to the maximum
operating frequency under the load and motor
conditions used. Using the following formula,
calculate the acceleration time from stop to [Pr.
20 Acceleration/deceleration reference frequency].
When the setting value of [Pr. 7] is 0.03s or less,
acceleration time is 0.04s (when V/F control,
General-purpose magnetic flux vector control,
Advanced magnetic flux vector control, or
Simple magnetic flux vector control). At that
time, [Pr. 20] should be set to "120Hz" or less.
For the acceleration time at automatic restart
after instantaneous power failure, refer to [Pr. 611
Acceleration time at a restart] (page 367)
[Pr. 20]
Acceleration
=
time setting
Maximum operating
frequency
[Example]
When [Pr. 20 = 60Hz], and [Pr. 10 = 0.5Hz], and
acceleration can be made up to the maximum
operating frequency of 50Hz in 10s
60Hz
[Pr. 7] =
50Hz-0.5Hz
(2) Deceleration time [Pr. 8]
Calculate the period of time required for linear
deceleration from the maximum operating
frequency to a stop under the load and motor
conditions used. Using the following formula,
calculate the deceleration time from [Pr. 20
Acceleration/deceleration reference frequency] to a
stop.
When the setting value of [Pr. 8] is 0.03s or less,
deceleration time is 0.04s (when V/F control,
General-purpose magnetic flux vector control,
Advanced magnetic flux vector control, or
Simple magnetic flux vector control). At that
time, [Pr. 20] should be set to "120Hz" or less.
[Pr. 20]
Deceleration
=
time setting
Maximum operating
frequency
[Example]
When the frequency can be decelerated down to
the maximum operating frequency of 50Hz in
10s with [Pr. 21 = 120Hz] and [Pr. 10 = 3Hz]
120Hz
[Pr. 8] =
50Hz-3Hz
common
Acceleration time from
stop to maximum
operating frequency
- [Pr. 13]
10s 12.1s
common
Deceleration time from
maximum operating
frequency to stop
- [Pr. 10]
10s 25.5s
(3) Second acceleration/deceleration time
[Pr. 44]
common
When the second function selection signal (RT)
turns ON, the acceleration/deceleration time set
in [Pr. 7, 8] is
deceleration time set in [Pr. 44] is active. In this
case, the acceleration time is equal to the
deceleration time. When the setting value of [Pr.
44] is 0.03s or less, acceleration/deceleration
time is 0.04s (when V/F control, General-
purpose magnetic flux vector control, Advanced
magnetic flux vector control, or Simple magnetic
flux vector control). At that time, [Pr. 20] should
be set to "120Hz" or less.
(4) Second deceleration time [Pr. 45]
common
When the second function selection signal (RT)
turns ON, the acceleration/deceleration time
changes to the value set in [Pr. 44]. In this case,
the acceleration time is equal to the deceleration
time.
To set the acceleration time and deceleration
time separately, set the second deceleration
time in [Pr. 45] and the second acceleration time
in [Pr. 44]. Setting of 9999 (initial value) in [Pr. 45]
causes the second deceleration time to be the
value set in [Pr. 44], making the acceleration and
deceleration times equal.When the setting value
of [Pr. 45] is 0.03s or less, deceleration time is
0.04s (when V/F control, General-purpose
magnetic flux vector control, Advanced magnetic
flux vector control, or Simple magnetic flux
vector control). At that time, [Pr. 20] should be set
to "120Hz" or less.
236
PARAMETER
ignored and the acceleration/