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Starting Frequency And Start-time Hold Function (pr. 13, Pr. 571)
Air-conditioning inverter.
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Setting of acceleration/deceleration time and acceleration/ deceleration pattern
4.8.2
Starting frequency and start-time hold function (Pr. 13, Pr. 571)
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
13
Starting frequency
571
Restart coasting time
V/F
V/F
V/F
GP
GP
GP
MFVC
MFVC
MFVC
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
Output
frequency
(Hz)
60
Setting
range
Pr. 13
0
STF
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.
Output
frequency (Hz)
60
Setting
range
Pr. 13
0
Pr. 571 setting time
STF
ON
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.
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
116
Name
Initial Value
(1)
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
Time
(2)
This function holds during the period set in Pr. 571 and the output
This function performs initial excitation to smooth the motor drive at a
Time
Refer to page 101
Setting Range
0.5Hz
0 to 60Hz
0 to 10s
9999
9999
Starting frequency setting (Pr. 13)
ON.
Start-time hold function (Pr. 571)
frequency set in Pr. 13 Starting frequency.
start.
REMARKS
When Pr. 13 = "0Hz", the starting frequency is held at 0.01Hz.
CAUTION
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
Description
Frequency at start can be set in the range
of 0 to 60Hz.
Starting frequency at which the start
signal is turned ON.
Holding time of Pr. 13 Starting frequency.
Holding function at a start is invalid
<V/F><GP MFVC>

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