Mitsubishi Electric FR-F740 EC Instruction Manual page 227

Parameter
Change the setting range and increments of the acceleration/deceleration time (Pr. 21)
Use Pr. 21 to set the acceleration/deceleration time and minimum setting range.
Setting "0" (initial value)............. 0 to 3600s (minimum setting increments 0.1s)
Setting "1" .................................. 0 to 360s (minimum setting increments 0.01s)
CAUTION:
E
Changing the Pr. 21 setting changes the acceleration/deceleration setting (Pr. 7, Pr. 8,
Pr. 16, Pr. 44, Pr. 45).
(The Pr. 611 "Acceleration time at a restart" setting is not affected.)
Example:
When Pr. 21 = 0, setting "5.0" s in Pr. 7 and "1" in Pr. 21 automatically changes the
Pr. 7 setting to "0.5" s.
Set multiple acceleration/deceleration time (RT signal, Pr. 44, Pr. 45, Pr. 147)
Pr. 44 and Pr. 45 are valid when the RT signal is ON, or the output frequency reaches or exceeds
the setting of Pr. 147. Switching the parameter sets allows you to operate motors with different
specifications and capabilities with the frequency inverter. If the RT signal is on then all other
second functions are active, for example the second torque boost setting.
When "9999" is set in Pr. 45, the second deceleration time becomes equal to the second ac-
celeration time (Pr. 44).
By setting Pr. 147, acceleration/deceleration time can be automatically changed at turn-OFF of
the RT signal.
Pr. 147
9999 (Initial value)
0.00Hz
0.00Hz ≤ Pr. 147 ≤ Set frequency
Set frequency < Pr. 147
Tab. 6-7:
When the RT signal turns ON, the acceleration/deceleration time switches to the second
acceleration/deceleration time even when the output frequency is not reached to Pr. 147
setting.
FR-F700 EC
Acceleration/Deceleration Time
Output frequency < Pr. 147:
Pr. 147 ≤ Output frequency:
Acceleration/deceleration times in dependence on parameter 147
Acceleration and deceleration
Description
No automatic switching of the accel-
Pr. 7, Pr. 8
eration/deceleration time
Second acceleration/deceleration
Pr. 44, Pr. 45
time from a start
Acceleration/deceleration time auto-
Pr. 7, Pr. 8
matic switching
Pr. 44, Pr. 45
No automatic switching, since output
Pr. 7, Pr. 8 frequency will not reach the switch-
ing frequency
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