Starting Frequency And Start-Time Hold Function - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.8.4

Starting frequency and start-time hold function

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.
13
F102
571
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)
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)
FR-A800
(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Name
Starting frequency
Holding time at a start
60
Pr. 13
0
STF
ON
60
Pr. 13
0
Pr. 571 setting time
STF
Initial value Setting range
0.5 Hz 0 to 60 Hz
0 to 10 s
9999
9999
Fig. 5-103:
Starting frequency parameter
Time
Fig. 5-104:
Holding time at start
Time
V/F V/F V/F Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Vector Sensorless
Description
Set the starting frequency at which
the start signal is turned ON.
Set the holding time of Pr. 13.
The holding function at a start is
invalid.
Vector Vector
I002566E
I002567E
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