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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". (Refer to page 162)
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
of 0 to 60Hz.
Starting frequency at which the start
signal is turned on.
571 Restart coasting time
9999
0 to 10s 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 of 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 Refer to page 83
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.