Mitsubishi FR - S500 Instruction Manual page 72

<Setting>
Use Pr. 7 and Pr. 44 to set the acceleration time required to reach the frequency set
in Pr. 20 from 0Hz.
Use Pr. 8 and Pr. 45 to set the deceleration time required to reach 0Hz from the
frequency set in Pr. 20.
Pr. 44 and Pr. 45 are valid when the RT signal is on. (*)
Set "- - -" in Pr. 45 to make the deceleration time equal to the acceleration time (Pr. 44).
CAUTION
1. In S-shaped acceleration/deceleration pattern A (refer to page 71), the set time is
the period required to reach the base frequency set in Pr. 3.
Acceleration/deceleration time calculation expression when the set frequency is
the base frequency or higher
t =
T: Acceleration/deceleration time setting (s)
f : Set frequency (Hz)
Guideline for acceleration/deceleration time at the base frequency of 60Hz
(0Hz to set frequency)
Frequency setting (Hz)
Acceleration/
deceleration time (s)
2. If the Pr. 20 setting is changed, the settings of calibration functions Pr. 38 and
Pr. 39 (frequency setting signal gains) remain unchanged.
To adjust the gains, adjust calibration functions Pr. 38 and Pr. 39.
3. When the setting of Pr. 7, Pr. 8, Pr. 44 or Pr. 45 is "0", the acceleration/
deceleration time is 0.04 seconds.
4. If the acceleration/deceleration time is set to the shortest value, the actual motor
acceleration/deceleration time cannot be made shorter than the shortest
acceleration/deceleration time which is determined by the mechanical system's J
(inertia moment) and motor torque.
* When the RT signal is on, the other second functions (Pr. 44, Pr. 45, Pr. 46,
Pr. 47) are also selected.
Related parameters
Base frequency setting
Acceleration/deceleration pattern, S-pattern acceleration/deceleration A
Pr. 29 "acceleration/deceleration pattern" (refer to page 71)
Calibration function
RT signal setting
Jog acceleration/deceleration time
4 T
2
× × f
2
9 (Pr. 3)
5
15
Pr. 3 "base frequency" (refer to page 59)
Pr. 38 "frequency setting voltage gain frequency", Pr. 39 "frequency
setting current gain frequency" (refer to page 74)
Pr. 60 to Pr. 63 (input terminal function selection) (refer to page 88)
Pr. 16 "jog acceleration/deceleration time"
(refer to page 67)
5
+ T
9
60 120
5
15
63
12
35
2