154 Description Of Specific Functions
V260 Series High Performance Closed-Loop Vector Inverter User Manual
F5.3.29 Lower limiting frequency action mode
Setting range: 0, 1
Factory default: 0
0: Output zero frequency when it is below the lower limiting frequency
If the value is less than the lower limiting frequency, the output of the inverter frequency is zero.
1: Output the lower limiting frequency when it is below the lower limiting frequency
If the value is less than the lower limiting frequency, the output of the inverter frequency is the lower limiting
frequency.
F5.3.30 Automatic voltage regulation(only
effective in V/F mode)
Setting range: 0, 1, 2
Factory default: 0
This parameter applies to the situation that frequency inverter operates with
V/F
mode, forcedly operate with
VC, SVC modes. Automatic voltage regulation function is used for ensuring the output voltage of frequency
inverter not fluctuate as the input voltage fluctuates. In condition that grid voltage fluctuates greatly, while
stable stator voltage and current of motor is required, this function shall be operated.
F5.3.31 Energy saving mode (only effective
for asynchronous motors)
Setting range: 0, 1
Factory default: 0
Magnetic flux operates optimally, and valid with asynchronous machine. Automatic energy saving operation
refers to frequency inverter can detect the load condition of motor automatically, and adjust output voltage
timely to make the motor operate at high efficient status, to reach optimal effect of energy saving.
Automatic energy saving operation has the best effect when the load change of motor is with low frequency
and wide range. The major energy saving way is to obtain additional energy saving effect from adjusting the
status of motor excitation, to make the motor operate at optimal high efficient status, and greatly lower the
energy consumption of motor.
Due to the specific corresponding relationship of draught fan, pump load and revolving speed, load condition
can be judged according to the output frequency. It is a typical special case of automatic energy saving
operation applying drop torque V/F curve. When applying drop torque
V/F
curve (
F1.2.17, F1.3.29
selection
as 1, 2, 3), without necessary of operating the automatic energy saving operation function.
F5.3.32 DC injection braking
Setting range: 0, 1, 2
Factory default: 0
Frequency inverter can increase the magnetic flux when the motor slows down to stop, to make the motor
stops more rapidly (see figure below).
The electric energy produced during the braking process is manly consumed in form of heat inside of the
motor. Therefore, frequent braking with magnetic flow will lead to the internal temperature of the motor
increase. Please be sure the motor temperature shall not over the maximum admissible value.
When input operation order during magnetic flow braking, magnetic flow will be canceled, and frequency
inverter will speed up again to the selected frequency. When applying braking resistor, generally the
magnetic flow braking shall be selected as invalid or lower the strength properly (F5.3.33).
0
60
20
40
Brake with magnetic flux
Frequency(Hz)
Brake without magnetic flux
Brake torque ( %)
25
50
Figure 7-43
Magnetic flow braking curve
