Mitsubishi Electric FR-V500 Instruction Manual page 99

Operation selection functions 1 (Pr. 17 to Pr. 37)
<Setting>
Pr. 29
Function
Setting
Linear
acceleration/
0
deceleration
(factory setting)
S-pattern
acceleration/
1 deceleration A
(torque variation
technique)
S-pattern
acceleration/
2
deceleration B
(shock absorption)
Backlash
measures
3
acceleration/
deceleration
S-pattern
4 acceleration/
deceleration C
REMARKS
For the acceleration/deceleration time, turning on the RT signal makes Pr. 44 "second acceleration/deceleration time" and Pr.
45 "second deceleration time" valid (turning on the X9 signal makes Pr. 110 and Pr. 111 valid). Refer to page 78.
Description
Acceleration/deceleration is made linearly up/down to
the preset speed .
The motor torque is utilized effectively to make fast
acceleration/deceleration in a large motor-generated
torque area and smooth acceleration/deceleration in a
small motor-generated torque area.
In this acceleration/deceleration pattern, the base
frequency is the inflection point of an S shape, and you
can set the acceleration/deceleration time according to
the reduction in motor torque in the constant-power
operation range at higher than the rated speed.
This function is valid for V/F control only. For other than
V/F control, linear acceleration/deceleration is made.
CAUTION
As the acceleration/deceleration time, set the
time taken to reach Pr. 3 "base frequency", not Pr.
20 "acceleration/deceleration reference speed".
For prevention of load shifting in conveyor and other
applications
This setting always provides S-pattern acceleration/
deceleration from s2 (current speed) to s1 (preset
speed), easing an acceleration/deceleration shock and
producing an effect on the prevention of load shifting in
conveyor and other applications.
Backlash measures for reduction gear, etc.
This function stops a speed change temporarily during
acceleration/deceleration, reducing a shock generated
when a reduction gear backlash is eliminated suddenly.
Use Pr. 140 to Pr. 143 to set the stopping times and
stopping speed in accordance with the chart on the right.
The acceleration/deceleration time is increased by the
stopping time.
REMARKS
Output speed is retained for the time for the starting
speed (Pr. 13) and s1 (Pr. 140) time at a start and
accelerate again after t1 time has elapsed. Speed
reaches or below s2 (Pr. 142) is retained for
(Pr. 143) time at a start of deceleration and
decelerate again after t2 time has elapsed.
See next page.
Output
speed
(r/min)
t2
90
Operation
[Linear acceleration
/deceleration]
Output
speed
(r/min)
Time
[S-pattern acceleration
/deceleration A]
Output
speed
(r/min)
Base frequency
Time
[S-pattern acceleration
/deceleration B]
s1
Output
speed
(r/min)
s2
Time
[Backlash measures function]
s2
Pr.142
s1
Pr.140
t1 Pr.141 t2 Pr.143
See next page.
Time