Powtran PI9000 series - Page 140

Chapter 5 Function parameter
134
F7.17
Reverse rotation control
Allow
0
0
☆
Prohibit
1
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.
F7.18
Set frequency lower than
lower limit frequency mode
Running at lower
limit frequency
0
0
☆
Stop
1
Zero speed running
2
When the set frequency is lower than the lower limit frequency, the inverter operating
status can be selected through the parameter. PI9000 provides three modes of operation to
meet the needs of a variety of applications.
F7.19
Droop control
0.00Hz to 10.00Hz
0 . 00Hz
☆
This function is generally used for the load distribution that several 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 several 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.
F7.20
Setting cumulative power-on
arrival time
0h to 36000h
0h
☆
When the total power-on time(F6.08) reaches the time set by F7.20, the inverter
multifunction digital DO outputs ON signal.
F7.21
Setting cumulative running
arrival time
0h to 36000h
0h
☆
Used to set the running time of inverter.
When the total power-on time(F6.07) reaches the set timeF7.21, the inverter
时间
t
正转
Reversal
死区时间
正反转死区时间示意图
输出频率
Hz
Output
frequency
Forward
Deadband
Schematic diagram of the deadband of forwad and reverse
ti
Time