Mitsubishi Electric F700 Instruction Manual page 82

(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 formula.
Deceleration
=
Maximum operating
time setting
frequency - Pr. 10
Example) When Pr. 20 = 120Hz, Pr. 10 = 3Hz, and deceleration can be
made up to the maximum operating frequency of 40Hz in 10s
(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.
Setting 0 (initial value)......................0 to 3600s (minimum setting increments 0.1s)
" "
Setting 1 ...........................................0 to 360s (minimum setting increments 0.01s)
" "
CAUTION
⋅ Changing the Pr. 21 setting changes the acceleration/deceleration setting (Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45).
(The Pr. 611 Acceleration time at a restart setting is not affected.)
<Example>
When Pr. 21 = "0", setting "5.0" s in Pr. 7 and "1" in Pr. 21 automatically changes the Pr. 7 setting to "0.5" s.
(4) Set multiple acceleration/deceleration time (RT signal, Pr.44, Pr.45)
⋅ Pr. 44 and Pr. 45 are valid when the RT signal is on. (When the RT signal is on, the other second functions such
as the second torque boost are also selected.) (Refer to page 88)
⋅ When "9999" is set in Pr. 45, the deceleration time becomes equal to the acceleration time (Pr. 44).
CAUTION
⋅ In S-shaped acceleration/deceleration pattern A (refer to page 77), the set time is the period required to reach the base
frequency set in Pr.3 Base frequency.
⋅ Acceleration/deceleration time formula when the set frequency is the base frequency or higher
4 T
×
× f 2
t =
2
9
(Pr.3)
T: Acceleration/deceleration time setting value(s)
f : Set frequency(Hz)
⋅ Guideline for acceleration/deceleration time when Pr. 3 Base frequency = 50Hz (0Hz to set frequency)
Frequency setting (Hz)
Acceleration/
deceleration time (s)
⋅ The RT signal can be assigned to the input terminal using any of Pr. 178 to Pr. 189 (Input terminal function selection). When
terminal assignment is changed, the other functions may be affected. Please make setting after confirming the function of
each terminal.
REMARKS
⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal
function selection), you can assign the RT signal to the other terminal.
⋅ If the Pr. 20 setting is changed, the Pr. 125 and Pr. 126 (frequency setting signal gain frequency) settings do not change. Set Pr.
125 and Pr. 126 to adjust the gains.
⋅ When the Pr. 7, Pr. 8, Pr. 44 and Pr. 45 settings are 0.03s or less, the acceleration/deceleration time is 0.04s. At that time, set
Pr. 20 to "120Hz" or less.
⋅ If the acceleration/deceleration time is set, the actual motor acceleration/deceleration time cannot be made shorter than the
shortest acceleration/deceleration time determined by the mechanical system J (inertia moment) and motor torque.
♦ Parameters referred to ♦
Pr. 3 Base frequency Refer to page 64
Pr. 29 Acceleration/deceleration pattern selection
Pr. 125, Pr. 126 (Frequency setting gain frequency)
Pr. 178 to Pr.189 (Input terminal function selection)
Pr.20
Deceleration time from maximum
×
operating frequency to stop.
5
T
+
9
50
5 5
15 15
Refer to page 77
Refer to page 129
Refer to page 85
Setting of acceleration/deceleration
time and acceleration/deceleration
Pr.8 =
40Hz - 3Hz
120 200 400
16 38 145
47 115 429
120Hz
× 10s
32.4s
75
3