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15/28 BCN-C22005-675
1.7 Setting the acceleration/deceleration time in the low-speed range
(Pr.791, Pr.792)
If torque is required in a low-speed range (less than 10% of the rated motor frequency), set Pr.791 Acceleration time in
low-speed range and Pr.792 Deceleration time in low-speed range settings higher than the Pr.7 Acceleration time and Pr.8
Deceleration time settings so that the mild acceleration/deceleration is performed in the low-speed range. Such a setting
is especially effective when the low-speed range high-torque characteristic is disabled (Pr.788 = "0"). (For an operation
with second acceleration/deceleration times, set the acceleration/deceleration times longer than the second
acceleration/deceleration times.)
Parameter
Number
Name
Initial
Value
Setting Range Description
791
Acceleration time in
low-speed range
9999
0 to 3600/360s*
Set the acceleration time in a low-speed
range (less than 10% of the rated motor
frequency).
9999
The acceleration time set in Pr.7 is applied.
(When the second functions are enabled,
the settings are applied.)
792
Deceleration time in
low-speed range
9999
0 to 3600/360s*
Set the deceleration time in a low-speed
range (less than 10% of the rated motor
frequency).
9999
The deceleration time set in Pr.8 is applied.
(When the second functions are enabled,
the settings are applied.)
* Depends on the Pr. 21 Acceleration/deceleration time increments setting. The initial value for the setting range is "0 to 3600s" and the setting
increments is "0.1s".
REMARKS
Set Pr.791 higher than Pr.7, and Pr.792 higher than Pr.8. If set as Pr.791 < Pr.7, the operation is performed as Pr.791 = Pr.7. If
set as Pr.792 < Pr.8, the operation is performed as Pr.792 = Pr.8.
Refer to page 6 for the rated motor frequency of MM-CF.
Low-speed range
(rated motor frequency/10
)
Acceleration time
Slope set by Pr.7
Deceleration time
Slope set by Pr.8
Deceleration time
in low-speed range
Slope set by Pr.792
A
cceleration time
in low-speed range
Slope set by Pr. 791
Time
Output
frequency
(Hz)
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