# Mitsubishi Electric FR-A820-00046 Instruction Manual Page 428

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Acceleration (RH)
Deceleration (RM)
Forward rotation (STF)
Fig. 5-100:
Acceleration/deceleration operation
● When the acceleration signal (RH) is turned ON, the set frequency increases. The increased speed
at this time is determined by the setting of Pr. 44 "Second acceleration/deceleration time". Turning
OFF the RH signal will stop increasing the set frequency and run the motor at the frequency at
that time.
● When the deceleration signal (RM) is turned ON, the set frequency decreases. The decreased speed
at this time is determined by the setting of Pr. 45 "Second deceleration time". When Pr. 45 = "9999",
the deceleration speed is the same as Pr. 44 setting. Turning OFF the RM signal will stop decreasing
the set frequency and runs the motor at the frequency at that time.
● When Pr. 59 = any of "11, 12 or 13", deceleration can be performed to a frequency equal to or lower
than the main speed (External operation mode frequency except multi-speed or PU operation
mode frequency).
Forward rotation (STF)
Fig. 5-101:
NOTE
While the RT signal is OFF, Pr. 44 "Second acceleration/deceleration time" and Pr. 45 "Second
deceleration time" are used as the set frequency accelerating/decelerating time at turn ON of the
acceleration/deceleration signal. If the Pr. 7 and Pr. 8 settings are longer, the acceleration/deceler-
ation time set by Pr. 7 and Pr. 8 are applied.
While the RT signal is ON, Pr. 44 and Pr. 45 settings are used as the acceleration/deceleration time
regardless of the Pr. 7 and Pr. 8 settings.
5 - 248
Set frequency
∗1
*1
0 Hz
0Hz
0
ON
ON
Clear (RL)
Power supply
*1 External operation frequency (other than multi-speed) or PU running frequency
Example of the remote setting function
Main speed
Minimum
frequency
0
ON
Acceleration (RH)
Deceleration (RM)
Acceleration/deceleration operation
When Pr. 59 = "1, 2, 11, 12"
When Pr. 59 = "3, 13"
ON
ON
ON
ON
Pr. 59 = "1, 2, 3"
Decelerates to the main speed
Pr. 59 = " 11, 12, 13"
Decelerates to the minimum frequency
ON
ON
When Pr. 59 = "1, 11"
When Pr. 59 = "2, 3, 12, 13"
ON
ON
ON
ON
Time
Parameters
Time
ON
I002563E
I002564E