PARAMETERS
74
<Setting>
!
Use Pr. 21 to set the acceleration/deceleration time and minimum setting
increments:
Set value "0" (factory setting).... 0 to 3600 s (minimum setting increments: 0.1 s)
Set value "1".............................. 0 to 360 s (minimum setting increments: 0.01 s)
!
When you have changed the Pr. 21 setting, set the deceleration time again.
!
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 "9999" in Pr. 45 to make the deceleration time equal to the acceleration time
(Pr. 44).
Note: 1. In S-shaped acceleration/deceleration pattern A (refer to page 82), 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 =
4
9
×
T
(Pr. 3)
2
×
f
2
+
5
9
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)
60
120
200
400
5
5
12
27
102
15
15
35
82
305
2. If the Pr. 20 setting is changed, the settings of calibration functions Pr. 903
and Pr. 905 (frequency setting signal gains) remain unchanged.
To adjust the gains, adjust calibration functions Pr. 903 and Pr. 905.
3. When the setting of Pr. 7, Pr. 8, Pr. 44 or Pr. 45 is "0", the acceleration/
deceleration time is 0.04 seconds. At this time, set 120Hz or less in Pr. 20.
4. When the RT signal is on, the other second functions such as second torque
boost are also selected.
5. If the shortest 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's J
(inertia moment) and motor torque.
