Changing Acceleration And Deceleration Time (Pr. 7, Pr. 8); Energy Saving Operation For Fans And Pumps (Pr. 14, Pr. 60) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Before operation
3.2.6

Changing acceleration and deceleration time (Pr. 7, Pr. 8)

Set in Pr. 7 Acceleration time a larger value for a slower speed increase and
a smaller value for a faster speed increase.
Set in Pr. 8 Deceleration time a larger value for a slower speed decrease and
a smaller value for a faster speed decrease. Refer to page 53 for how to
change the parameter setting.
Parameter
Name
Number
7 Acceleration time
8 Deceleration time
* Depends on the Pr. 21 Acceleration/deceleration time increments setting. The initial value for the setting range is "0 to 3600s" and setting increments is
"0.1s".
3.2.7

Energy saving operation for fans and pumps (Pr. 14, Pr. 60)

Set the following functions to perform energy saving operation for fans and pumps.
(1) Load pattern selection (Pr. 14)
Select the optimum output characteristic (V/F characteristic) that is suitable for the application and load
characteristics.
Parameter
Name
Number
Load pattern
14
selection
Set Pr.14 Load pattern selection = "1 (for variable-torque load)."
When the output frequency is equal to or less than the base frequency, the
output voltage changes by its square in proportion to the output frequency.
Use this setting to drive a load whose load torque changes in proportion to
the square of the speed, such as a fan and a pump.
CAUTION
Load pattern selection is available only under V/F control. Load pattern selection is not available under Advanced magnetic flux
vector control, Real sensorless vector control and vector control.
60
Initial Value
5s
7.5K or lower
15s
11K or higher
5s
7.5K or lower
15
11K or higher
Setting
Initial Value
Range
0
1
2
3
0
4
5
Pr.20
(60Hz)
Pr.7
Acceleration
Pr.44
time
Pr.110
Setting
Description
Range
0 to 3600/
Set the motor acceleration time.
360s
*
0 to 3600/
Set the motor deceleration time.
360s
*
Description
For constant torque load
For variable-torque load
For constant torque elevators
(at reverse rotation boost of 0%)
For constant torque elevators
(at forward rotation boost of 0%)
RT signal ON: for constant torque load
RT signal OFF: for constant torque
elevators at reverse rotation boost of 0%
RT signal ON: for constant torque load
RT signal OFF: for constant torque
elevators at forward rotation boost of 0%
Pr.14 = 1 (Hz)
100%
Pr.3 Base frequency
Output frequency (Hz)
Running
frequency
Time
Pr.8
Deceleration
Pr.45
time
Pr.111