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9. (F) Settings for Acceleration/Deceleration
9.4 Starting frequency and start-time hold function
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9.4
Starting frequency and start-time hold function
It is possible to set the starting frequency and hold the set starting frequency for a certain period of time.
Set these functions when a starting torque is needed or the motor drive at start needs smoothing.
Starting frequency setting (Pr.13)
• The frequency at start can be set in the range of 0 to 60 Hz.
• Set the starting frequency at which the start signal is turned ON.
NOTE
• The inverter does not start if the frequency setting signal has a value lower than that of
Pr.13
.
For example, while
Pr.13
= 5 Hz, the inverter output starts when the frequency setting signal reaches 5 Hz.
Start-time hold function (Pr.571)
• This function holds during the period set in
Pr.571
and the output frequency set in
Pr.13 Starting frequency
.
• This function performs initial excitation to smooth the motor drive at a start.
NOTE
• When
Pr.13
= 0 Hz, the starting frequency is held at 0.01 Hz.
• When the start signal was turned OFF during start-time hold, deceleration is started at that point.
• At switching between forward rotation and reverse rotation, the starting frequency is valid but the start-time hold function is
disabled.
Parameters referred to
Pr.2 Minimum frequency
V/F
V/F
V/F
Magnetic flux
Magnetic flux
Magnetic flux Sensorless
Sensorless
Sensorless Vector
Vector
Vector
Pr.
Name
Initial value
Setting range
Description
13
F102
Starting frequency
0.5 Hz
0 to 60 Hz
Set the starting frequency at which the start signal is turned
ON.
571
F103
Holding time at a start
9999
0 to 10 s
Set the holding time of the frequency set in
Pr.13
.
9999
The holding function at start is disabled.
Output
frequency
(Hz)
Time
60
Pr.13
Setting range
STF
ON
0
Output
frequency
(Hz)
Time
Pr.13
Pr. 571
setting time
STF
ON
0
60
Setting range
CAUTION
• Note that when
Pr.13
is set to a value equal to or lower than the setting of
Pr.2 Minimum frequency
, simply turning ON
the start signal runs the motor at the frequency set in
Pr.2
even if the command frequency is not given.
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 ...
