Mitsubishi Electric FR-A720-0.4K Instruction Manual page 189

Setting of acceleration/deceleration time
and acceleration/deceleration pattern
Pr. 516 Pr. 517
Start signal Start signal Start signal
ON ON ON
Pr. 517
Pr. 516
Linear acceleration
Pr. 516/2
Slope of Pr. 7, Pr. 44, Pr. 110
T1
T2
Pr. 518
Acceleration/
deceleration
reference
frequency
Linear deceleration
(Pr. 20)
Pr. 8, Pr. 45 Pr. 111
Pr. 518/2
178
Pr. 518 Pr. 519
Time
Acceleration/deceleration
reference frequency (Pr. 20)
Pr. 517/2
Starting frequency
(Pr. 13)
Pr. 519
Pr. 519/2
DC injection
brake operation
T1
frequency
(Pr. 10)
T2
(6) S-pattern acceleration/deceleration D (Pr. 29 =
"5", Pr. 516 to Pr. 519)
⋅ Set the time taken for S-pattern operation of S-pattern
acceleration/deceleration using Pr. 516 to Pr. 519.
Set each S-pattern operation time for acceleration start (Pr.
516), acceleration completion (Pr. 517), deceleration start
(Pr. 518) and deceleration completion (Pr. 519).
⋅ When
S-pattern acceleration/deceleration
acceleration/deceleration time will become longer as
follows:
Actual acceleration time T2 = set acceleration time T1 +
(S-pattern time at a start of acceleration+S-pattern
time at a completion of acceleration) /2
Actual deceleration time T2 = set deceleration time T1 +
(S-pattern time at a start of deceleration+S-pattern
time at a completion of deceleration) /2
Set acceleration/deceleration time T1 indicates the actual
time taken for linear acceleration/deceleration calculated
based on the Pr. 7, Pr. 8, Pr. 44, Pr. 45, Pr. 110 and Pr. 111
setting.
CAUTION
⋅ Even if the start signal is turned OFF during acceleration,
the inverter will not decelerate immediately to avoid sudden
frequency change.
immediately accelerate when deceleration is changed to
reacceleration by turning the start signal ON during
deceleration, etc.)
⋅ For example, the actual acceleration time when starting the
inverter with an S-pattern acceleration/deceleration pattern
D selected for a stop to 60Hz with the parameter initial
value is as shown left:
Set acceleration time T1 = (Set frequency - Pr. 13)
Actual acceleration time T2 = set acceleration time T1 + (Pr. 516
+ Pr. 517) /2
Therefore,
Set acceleration time T1 = (60Hz - 0.5Hz)
Actual acceleration time T2 = 4.96s + (0.1s + 0.1s)/2
⋅ The actual deceleration time when stopping the inverter
with an S-pattern acceleration/deceleration D selected from
running frequency to 0 Hz with the parameter initial value is
as shown left:
Set deceleration time T1 = (Set frequency - Pr. 10*)
Actual deceleration time T2 = Set deceleration time T1 + (Pr. 518
* Pr.10.... DC injection brake operation frequency
Therefore,
Set deceleration time T1 = (60Hz - 3Hz)
Actual deceleration time T2 = 4.75 + (0.1s + 0.1s)/2
D
(Likewise, the inverter will
×
Pr. 7/Pr. 20
×
5s/60Hz
4.96s (actual acceleration time
at linear acceleration)
= 5.06s (acceleration time at
S-pattern acceleration)
×
Pr. 8/Pr. 20
+ Pr. 519) /2
×
5s/60Hz
4.75s (actual deceleration
time at linear deceleration)
= 4.85 (deceleration time at
S-pattern deceleration)
is set,
not