# Starting Frequency And Start-time Hold Function (pr. 13, Pr. 571) - Mitsubishi Electric FR-B-750 to 75K Instruction Manual

Fr-b-750 to 75k (200v class), fr-b-750 to 110k (400v class).

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
Holding time at a start
Output
frequency
(Hz)
60
Pr.13
0
Forward
ON
rotation
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.
Output
frequency
(Hz)
60
Pr.13
0
Pr.571 setting time
Forward
rotation
ON
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.
Note that when Pr. 13 is set to any value 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
90
Name
Initial Value
0.5Hz
9999
(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
Time
(2) Start-time hold function (Pr. 571)
⋅ This function holds the time set in Pr. 571 and the output
⋅ This function performs initial excitation to smooth the motor drive
Time
Refer to page 79
Setting Range
0 to 60Hz
0.0 to 10.0s
9999
turned on.
frequency set in Pr. 13 Starting frequency.
at a start.
REMARKS
When Pr. 13 = "0Hz", the starting frequency is held at 0.01Hz.
CAUTION
Description
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.
Set the holding time of Pr. 13 Starting
frequency.
Holding function at a start is invalid