Chapter 5 Function parameter
93
Output Frequency（Hz）
Set frequency（Hz）
F7.15
F7.14
Acceleration
time 2
Deceleration
time 1
Time(t)
Acceleration
time 1
Deceleration
time 2
Figure 5-20:Schematic diagram of switching between acceleration and deceleration
If the operating frequency is less than F7.14, select acceleration time 2; otherwise select
acceleration time 1.
For the above figure in the process of deceleration, if the operating frequency is more than
F7.15, select deceleration time 1; otherwise select deceleration time 2.
Forward/reverse rotation deadband
It is the waiting time that the inverter reaches zero speed when the parameter is used to switch
between forward and reverse rotation.
Output frequency Hz
Time(t)
Forward
Deadband
Reverse
Figure 5-21:Schematic diagram of the deadband of forwad and reverse
For certain production equipments, the reverse rotation may result in damage to the
equipment, the function can disable the reverse rotation. The factory default allows reverse
rotation.
Set frequency lower than
lower limit frequency mode
Running at lower limit frequency
When the set frequency is lower than the lower limit frequency, the inverter operating status
can be selected through the parameter. ST500 provides three modes of operation to meet the needs
of a variety of applications.
This function is generally used for the load distribution that multiple motors drag the same
one load.
The droop control means that the inverter output frequency is decreased as the load is
increased, so that when multiple motors drag(work for)the same one load, each motor's output
frequency much drops, which can reduce the load of the motor to balance evenly multiple motors'
load .
This parameter means the decreased value of output frequency when the inverter outputs the
rated load.
Setting cumulative power-on arrival time
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