Minimum Motor Speed Frequency And Hold Function At The Motor Start Up - Mitsubishi Electric FR-A800 Series Instruction Manual

• 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
disabled.
CAUTION
• Note that when Pr.13 is set to a value equal to or lower than the setting of 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 428
5.8.5 Minimum motor speed frequency and hold
function at the motor start up
PM PM PM
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.
13
Starting frequency
F102
571
Holding time at a start
F103
 Starting frequency setting (Pr.13)
• The frequency where the PM motor starts running can be set in the range of 0 to 60 Hz.
• When the frequency command specifies the frequency less than the one set in Pr.13 Starting frequency, the PM motor
is stopped.
When the frequency command specifies the frequency equal to the set frequency or higher, the PM motor accelerates
according to the setting of Pr.7 Acceleration time.
Output
frequency
(Hz)
60
Set frequency
Pr.13
0
Output from 0.01Hz
STF
382
5. PARAMETERS
5.8 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
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Time
Name Initial value
Minimum frequency /
minimum rotations per minute
9999
Output
frequency
Time
ON
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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