Mitsubishi Electric FR-A740-00023 Instruction Manual page 182

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
CAUTION
⋅ When the acceleration/deceleration time (Pr. 7, Pr. 8, etc.) setting under real sensorless vector control or vector control is 0s, the
S-pattern acceleration/deceleration A to D (Pr. 29 = "1, 2, 4, 5") is linear acceleration/deceleration.
⋅ Set linear acceleration/deceleration (Pr. 29 = "0 (initial value)") when torque control is exercised under real sensorless vector
control or vector control. When acceleration/deceleration patterns other than the linear acceleration/deceleration are selected,
the protective function of the inverter may function.
♦ Parameters referred to ♦
Pr. 3 Base frequency Refer to page 153
Pr. 7 Acceleration time, Pr. 8 Deceleration time, Pr. 20 Acceleration/deceleration reference frequency
Pr. 178 to Pr. 189 ( Input terminal function selection )
172
Pr. 518 Pr. 519
Time
Acceleration/deceleration
reference frequency (Pr. 20)
Pr. 517/2
Starting frequency
(Pr. 13)
Refer to page 222
(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 50Hz in the parameter initial setting
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 = (50Hz - 0.5Hz)
Actual acceleration time T2 = 4.95s + (0.1s + 0.1s)/2
D
(Likewise, the inverter will
×
Pr. 7/Pr. 20
×
5s/50Hz
4.95s (actual acceleration time
at linear acceleration)
= 5.05s (acceleration time at
S-pattern acceleration)
Refer to page 167
is set,
not