198
9. (F) Settings for Acceleration/Deceleration
9.1 Setting the acceleration and deceleration time
Control block diagram
Acceleration time setting (Pr.7, Pr.20)
• Use
Pr.7 Acceleration time
to set the acceleration time required to change the frequency to the frequency set in
Pr.20
Acceleration/deceleration reference frequency
from stop status.
• Set the acceleration time according to the following formula.
• For example, the following calculation is performed to find the setting value for
Pr.7
when increasing the output frequency
to the maximum frequency of 50 Hz in 10 seconds with
Pr.20
= 60 Hz (initial value) and
Pr.13
= 0.5 Hz.
Deceleration time setting (Pr.8, Pr.20)
• Use
Pr.8 Deceleration time
to set the deceleration time required to change the frequency from the frequency set in
Pr.20
Acceleration/deceleration reference frequency
to stop status.
• Set the deceleration time according to the following formula.
• For example, the following calculation is used to find the setting value for
Pr.8
when decreasing the output frequency from
the maximum frequency of 50 Hz in 10 seconds with
Pr.20
= 120 Hz and
Pr.10
= 3 Hz.
NOTE
• If the acceleration/deceleration time is set, the actual motor acceleration/deceleration time cannot be made shorter than the
shortest acceleration/deceleration time determined by the mechanical system J (moment of inertia) and motor torque.
• 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.
• Under PM sensorless vector control, if the protective function (E.OLT) is activated due to insufficient torque in the low-speed
range, set longer acceleration/deceleration times only in the low-speed range in
Pr.791 Acceleration time
in low-speed range
and
Pr.792 Deceleration time in low-speed range
.
JOG
(
Pr.16
)
Output frequency
Pr.147
(or
Pr.147
= “9999” )
RT-OFF
JOG-OFF
JOG-ON
RT-ON
Output frequency 10% of the rated motor frequency
Acceleration and
deceleration time
(
Pr.7, Pr.8
)
Second acceleration and
deceleration time
(
Pr.44, Pr.45
)
Acceleration and
deceleration time
in low-speed range
(
Pr.791, Pr.792
)
Output frequency
Pr.147
Acceleration time
or
deceleration time
Output frequency 10% of the rated motor frequency
Acceleration time setting =
Pr.20
setting × (Acceleration time to change the frequency from stop status to maximum
frequency) / (Maximum frequency -
Pr.13
setting)
Pr.7
setting = 60 Hz × 10 s / (50 Hz - 0.5 Hz)
≈
12.1 s
Set
frequency
Acceleration
time
Deceleration
time
Time
Pr.20
Pr.7
Pr.8
Output
frequency
(Hz)
Pr.44
Pr.45
(60Hz/50Hz)
Deceleration time setting =
Pr.20
setting × (Deceleration time to change the frequency from maximum frequency to stop
status) / (Maximum frequency -
Pr.10
setting)
Pr.8
setting = 120 Hz × 10 s / (50 Hz - 3 Hz)
≈
25.5 s
Summary of Contents for FR-E800
Page 17: ...16 1 Introduction 1 3 Related manuals MEMO ...
Page 51: ...50 2 Basic Operation 2 8 I O terminal function assignment MEMO ...
Page 89: ...88 3 Parameters 3 4 Parameter list by function group number MEMO ...
Page 135: ...134 5 Speed Control 5 9 Troubleshooting in the speed control MEMO ...
Page 153: ...152 6 Torque Control 6 7 Troubleshooting in torque control MEMO ...
Page 195: ...194 8 E Environment Setting Parameters 8 18 Current average value monitor signal MEMO ...
Page 237: ...236 10 D Operation Command and Frequency Command 10 6 Operation by multi speed setting MEMO ...
Page 339: ...338 13 T Multi Function Input Terminal Parameters 13 9 Start signal operation selection MEMO ...
Page 455: ...454 16 G Control Parameters 16 13 Speed smoothing control MEMO ...
