Mitsubishi Electric FR-A800, Instruction Manual

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Parameters (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
FR-A800 5 - 251
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.
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.
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.
Pr. Name Initial value Setting range Description
13
F102
Starting frequency 0.5 Hz 0 to 60 Hz
Set the starting frequency at which
the start signal is turned ON.
571
F103
Holding time at a start 9999
0 to 10 s Set the holding time of Pr. 13.
9999
The holding function at a start is
invalid.
Fig. 5-102:
Starting frequency parameter
I002566E
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.
Fig. 5-103:
Holding time at start
I002567E
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector
60
0
Output
frequency
(Hz)
Time
ON STF
Pr. 13
Setting r
a
nge
0
60
Output
frequency
(Hz)
Setti
n
g
rang
e
Pr. 13
STF
Pr. 571 setting time
Time