Starting Frequency And Start-Time Hold Function; Starting Frequency Setting (Pr.13); Start-Time Hold Function (Pr.571) - Mitsubishi Electric FR-F800 Instruction Manual

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
5.5.4

Starting frequency and start-time hold function

V/F V/F V/F
It is possible to set the starting frequency and hold the set starting frequency for a certain period of time.
Set these functions when a starting torque is needed or the motor drive at start needs smoothing.
Pr. Name
13
Starting frequency
F102
571
Holding time at a start
F103
Starting frequency setting (Pr.13)
• The frequency at start can be set in the range of 0 to 60 Hz.
• Set the starting frequency at which the start signal is turned ON.
Output
frequency
(Hz)
60
Pr.13
0
STF ON
NOTE
• The inverter does not start if the frequency setting signal is less than the value set in Pr.13.
For example, while Pr.13 = 5 Hz, the inverter output starts when the frequency setting signal reaches 5 Hz.
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 function performs initial excitation to smooth the motor drive at a start.
Output
frequency
(Hz)
60
Pr.13
0
Pr. 571 setting time
STF ON
NOTE
• When Pr.13 ="0 Hz", the starting frequency is held at 0.01 Hz.
• 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 page 245
Magnetic flux Magnetic flux Magnetic flux
Initial value
0.5 Hz
9999
Time
Time
Setting range
Set the starting frequency at which the
0 to 60 Hz
start signal is turned ON.
0 to 10 s Set the holding time of Pr.13.
9999 The holding function at a start is invalid.
Description
197
PARAMETERS
5
GROUP
F