Mitsubishi FR-A800

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
PARAMETERS
299
5
GROUP
F
5.8.5 Minimum motor speed frequency and hold
function at the motor start up
Starting frequency setting (Pr.13)
• The frequency where the PM motor starts running can be set in the range of 0 to 60 Hz.
• While the frequency command is less than the Pr.13 Starting frequency setting, the PM motor is stopped.
When the frequency command reaches the set frequency or higher, the PM motor accelerates according to the Pr.7
Acceleration time setting.
NOTE
• Under induction motor control (under V/F control, Advanced magnetic flux vector control, Real sensorless vector control, and
vector control), the output starts at the frequency set in Pr.13. Under PM sensorless vector control, the output always starts at
0.01 Hz.
• The inverter output does not start when the frequency-setting signal is less than Pr.13. For example, while Pr.13 = "20 Hz",
the inverter output starts when the frequency setting signal reaches 20 Hz.
Start-time hold function (Pr.571)
• This function holds 0.01 Hz during the period set in Pr.571.
• Pr.571 is active when the low-speed range high-torque characteristic is enabled (Pr.788="9999").
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Parameters referred to
Pr.2 Minimum frequency page 345
Pr.7 Acceleration time page 285
Set the frequency where the PM motor starts running. Set the deadband in the low-speed range to eliminate noise and
offset deviation when setting a frequency with analog input.
Pr. Name Initial value Setting range Description
13
F102
Starting frequency
Minimum frequency/
Minimum rotations
per minute
0 to 60 Hz
Set the frequency where the motor starts
running.
571
F103
Holding time at a start
9999
0 to 10 s Set the time to hold 0.01 Hz.
9999 The holding function at start is disabled.
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 frequency set in Pr.2 even if the command frequency is not input.
PM
PM
PM
Output
frequency
(Hz)
Set frequency
Output
frequency
Output from 0.01Hz
Time
60
Pr.13
Setting range
STF ON
0
Pr.571 setting time
STF ON
0
60
Holds 0.01 Hz
Output
frequency
(Hz)
Time
Setting range