93
Setting of acceleration/deceleration time and acceleration/ deceleration pattern
4.7.2
Starting frequency and start-time hold function (Pr. 13, Pr. 571)
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
You can set the starting frequency and hold the set starting frequency for a certain period of time.
Set these functions when you need the starting torque or want to smooth motor drive at a start.
Parameter
Number
Name
Initial Value
Setting Range
Description
13
Starting frequency
0.5Hz
0 to 60Hz
Frequency at start can be set in the range
0 to 60Hz.
Starting frequency at which the start
signal is turned on.
571
Restart coasting time
9999
0.0 to 10.0s
Holding time of
Pr. 13 Starting frequency
.
9999
Holding function at a start is invalid
(1) Starting frequency setting
(Pr. 13)
Frequency at start can be set in the range 0 to 60Hz.
You can set the starting frequency at which the start signal is turned
on.
NOTE
The inverter will not start if the frequency setting signal is less than the value set in
Pr. 13
.
For example, when 5Hz is set in
Pr. 13
, the motor will not start running until the frequency setting signal reaches 5Hz.
(2) 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 fnction performs initial excitation to smooth the motor drive at a
start.
NOTE
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 invalid.
CAUTION
Note that when
Pr. 13
is set to any value equal to or lower than
Pr. 2 Minimum frequency
, simply turning on the
start signal will run the motor at the preset frequency even if the command frequency is not input.
Parameters referred to
Pr. 2 Minimum frequency
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
REMARKS
When
Pr. 13
= "0Hz", the starting frequency is held at 0.01Hz.
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