Mitsubishi FR-A740-00023-EC, Instruction Manual

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169
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4
P
ARAME
T
E
R
S
4.12.2 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
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.
You can set the starting frequency at
which the start signal is turned on.
571 Holding time at a start 9999
0.0 to 10.0s
Set the 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.
CAUTION
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 the time 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.
CAUTION
⋅
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 less 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 151
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.