# Minimum Motor Speed Frequency And Hold Function At The Motor Start Up - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

Fr-a800 series.

5.8.5
Minimum motor speed frequency and hold
function at the motor start up
PM
PM
PM
Set the frequency where the IPM 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
13
Starting frequency
F102
571
Holding time at a start
F103
 Starting frequency setting (Pr.13)
• The frequency where the IPM 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.
Output
frequency
(Hz)
60
Set frequency
Pr.13
0
Output from 0.01Hz
STF
ON
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 does not start if the frequency setting signal has a value lower than that of 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").
Output
frequency
(Hz)
60
0
Pr.571 setting time
STF
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 runs the motor at the frequency set in Pr.2 even if the command frequency is not given.
Parameters referred to
Pr.2 Minimum
frequencypage 407
Pr.7 Acceleration
timepage 349
364
5. PARAMETERS
5.8 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Initial value
Minimum frequency/
minimum rotations per minute
9999
Output
frequency
Time
Time
Holds 0.01 Hz
ON
Setting range
Set the frequency where the motor starts
0 to 60 Hz
running.
0 to 10 s
Set the time to hold 0.01 Hz.
9999
The holding function at start is disabled.
Description  