Mitsubishi Electric FR-E700EX Instruction Manual page 128

Setting of acceleration/deceleration time and acceleration/deceleration pattern
Pr.20
(3000r/min)
Acceleration time Deceleration time
Pr.7, Pr.44
Example) How to find the setting value for Pr.7 when increasing the rotation
speed to the maximum speed of 2500r/min in 10s with Pr.20 =
3000r/min (initial setting)
(2) Deceleration time setting (Pr.8, Pr.20)
 Use Pr.8 Deceleration time to set the deceleration time required to reach 0r/min from Pr.20 Acceleration/deceleration reference
speed.
 Set the deceleration time according to the following expression.
Deceleration
=
time setting
Maximum operating speed - Pr.10*
 For Pr.11 = "0". When Pr.11 "0", "-Pr.10" is not required.
Example) How to find the setting value for Pr.8 when decreasing the
rotation speed from the maximum speed of 2500r/min in 10s with
Pr.20 = 3000r/min, Pr.10 = 90r/min (initial setting) and Pr.11 = 0.
REMARKS
 If the protective function (E.OLT) is activated due to insufficient torque in the low-speed range, set longer acceleration/
deceleration times in the low-speed range only by Pr.791 Acceleration time in low-speed range and Pr.792 Deceleration time in low-
speed range.
(3) Set two kinds of acceleration/deceleration times (RT signal, Pr.44, Pr.45, Pr.147 )
 Pr.44 and Pr.45 are valid when the RT signal is ON, or the rotation speed reaches or exceeds the setting of Pr.147.
 When "9999" is set to Pr.45, the deceleration time becomes equal to the acceleration time (Pr.44).
 For the RT signal, set "3" in any of Pr.178 to Pr.184 (input terminal function selection) to assign the function.
 Acceleration/deceleration time changes when the RT signal turns ON or the rotation speed reaches the Pr.147 setting or
higher.
Pr.147 Setting
9999 (initial value)
0r/min
1r/min Pr.147 Set speed
Set speed < Pr.147
 When the RT signal turns on, the acceleration/deceleration time switches to the second acceleration/deceleration time even when the speed is not
reached to Pr.147 setting.
NOTE
 Changing terminal assignment may affect the other functions. Set parameters after confirming the function of each
terminal.
126
(1) Acceleration time setting (Pr.7, Pr.20)
 Use Pr.7 Acceleration time to set the acceleration time required to reach Pr.20
Acceleration/deceleration reference speed from 0r/min.
Running
speed
 Set the acceleration time according to the following formula.
Time
Acceleration
time setting
Pr.8, Pr.45
Pr.20
Acceleration/Deceleration Time
Pr.7, Pr.8
Pr.44, Pr.45
Rotation speed < Pr.147: Pr.7, Pr.8
Pr.147 rotation speed: Pr.44, Pr.45
Pr.7, Pr.8
Rotation speed
(r/min)
Set
speed
Pr.147
setting
Slope set
by Pr.7
Acceleration time
Pr.20
=
Maximum operating speed
Pr.7 =

Deceleration time from the maximum operating speed to a stop
Pr.8
No automatic switching of the acceleration/deceleration time
Second acceleration/deceleration time from a start
Acceleration/deceleration time automatic switching 
No automatic switching, since speed will not reach the
switching speed
Slope set Slope set
Slope set
by Pr.44 by Pr.8
by Pr.44
(Pr.45)
Deceleration time
Acceleration time from

a stop to the maximum
operating speed
3000r/min

10s = 12s
2500r/min
3000r/min

=
2500r/min - 90r/min
Description
Time
10s 12.5s