5-62
Acceleration/deceleration time
<S-curve acceleration/deceleration (weak): when the frequency change is 10% or more of the
maximum frequency>
Acceleration or deceleration time (s): (2 u 5/100 + 90/100+ 2 u 5/100) u (reference
acceleration or deceleration time)
= 1.1 u (reference acceleration or deceleration time)
<S-curve acceleration/deceleration (strong): when the frequency change is 20% or more of
the maximum frequency>
Acceleration or deceleration time (s): (2 u 10/100 + 80/100 + 2 u 10/100) u (reference
acceleration or deceleration time)
= 1.2 u (reference acceleration or deceleration time)
Curvilinear acceleration/deceleration
Acceleration/deceleration is linear below the base frequency (constant torque) but it slows
down above the base frequency to maintain a certain level of load factor (constant output).
This acceleration/deceleration pattern allows the motor to accelerate or decelerate with the
maximum performance of the motor.
Choose an appropriate acceleration/deceleration time, taking into account the
machinery’s load torque.
H09, H49 Starting Mode (Auto search and Delay time)
H09 specifies the auto search mode for idling motor speed to run the idling motor without
stopping it.
The auto search applies to both a restart of the inverter after a momentary power failure and
every normal startup.
The auto search mode can be switched by assigning an STM terminal command ("Enable
auto search for idling motor speed at starting") to a digital input terminal with any of E01 to E05
(function code data = 26). If no STM is assigned, the inverter interprets STM as being OFF by
default.
Auto search for idling motor speed
Starting the inverter (with a run command ON, BX OFF, auto-reset, etc.) with STM being ON
searches for the idling motor speed for a maximum of 1.2 seconds to run the idling motor
without stopping it. After completion of the auto search, the inverter accelerates the motor up
to the reference frequency according to the frequency command and the preset acceleration
time.
Auto search for idling motor speed to follow
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