Mitsubishi Electric 700 Series Instruction Manual page 122

Setting of acceleration/deceleration time and acceleration/ deceleration pattern
Pr. 20
(60Hz)
Acceleration time Deceleration time
Pr. 7, Pr. 44
Pr. 8, Pr. 45
Example) How to find the setting value for Pr.7 when increasing the output
frequency to the maximum frequency of 50Hz in 10s with Pr.20 = "60Hz
(initial setting)" and Pr. 13 = "0.5Hz (initial setting)."
(2) Deceleration time setting (Pr. 8, Pr. 20)
Use Pr. 8 Deceleration time to set the deceleration time required to reach 0Hz from Pr. 20 Acceleration/deceleration reference
frequency.
Set the deceleration time according to the following expression.
Deceleration
=
time setting Maximum operating frequency - Pr. 10
Example) How to find the setting value for Pr.8 when decreasing the output
frequency from the maximum frequency of 50Hz in 10s with Pr.20 =
"120Hz" and Pr. 10 = "3Hz (initial setting)."
(3) Change the setting range and increments of the acceleration/deceleration time (Pr. 21)
Use Pr. 21 to set the acceleration/deceleration time and minimum setting range.
Value "0" (initial value) ...........................0 to 3600s (minimum setting increments: 0.1s)
Value "1" .................................................0 to 360s (minimum setting increments: 0.01s)
NOTE
Changing the Pr. 21 setting changes the acceleration/deceleration time setting (Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45).
(It does not influence the setting of Pr. 611 Acceleration time at a restart .)
<Example>
When Pr. 7 is set to "5.0s" at Pr. 21 setting of "0", and then Pr. 21 is changed to "1", the Pr. 7 setting automatically
changes to "0.5s".
(1) Acceleration time setting (Pr. 7, Pr. 20)
Use Pr. 7 Acceleration time to set the acceleration time required to reach Pr. 20
Running
Acceleration/deceleration reference frequency from 0Hz.
frequency
Set the acceleration time according to the following formula.
Time
Acceleration
time setting
Pr. 20
Pr. 20
Acceleration time from a stop to the
×
=
Maximum operating
maximum operating frequency
frequency - Pr. 13
Pr. 7 =
×
Deceleration time from the maximum operating frequency to a stop
Pr. 8 =
60Hz
× 10s
12.1s
50Hz - 0.5Hz
120Hz
× 10s
25.5s
50Hz-3Hz
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