User Manual
EM303B General Purpose Inverter
151
FC-18 ones place=1 AVR enabled (Enabled all the time)
If input voltage< rated input voltage of inverter, and output frequency> corresponding
frequency to the voltage on V/F curve, inverter will output maximum voltage to make motor
work at maximum capacity. If input voltage > rated input voltage of inverter, inverter will
drop the output voltage and remains V/F proportion.
FC-18 ones place=2 AVR enabled automatically
Inverter will adjust output voltage automatically based on the changes of load and grid power.
It ensures that motor runs in constant torque at low speed or in constant capacity at high speed,
and makes motor run at optimized status.
FC-18 tens place=0 AVR limit disabled
AVR base fixed as 100%.
FC-18 tens place=1 AVR limit enabled
Inverter selects internal AVR base automatically.
8.13.14
Overvoltage Protection Control
No.
Function
Range
Unit Default Type
FC-19
Overvoltage
Protection Control
Ones place: Not Used
Tens Place: Dynamic brake options
0: Braking resistor disabled
1: Braking resistor is enabled in
operation
2: Braking resistor is enabledat
power-on
Hundreds place: Not Used
Thousands place:
Voltage stall protection mode
0.Void
1.Under voltage stall effective
2.Over voltage stall effective
3.Both under voltage stall and over
voltage stall effective
2000
〇
Generally DC bus overvoltage is caused by deceleration. Due to energy feedback, DC bus
voltage will rise at deceleration. When DC bus voltage> overvoltage threshold:
If dynamic brake is enabled, built-in braking unit is switched on. External resistor will
consume part of feedback energy. Until DC bus voltage< lower limit of overvoltage stall
voltage, inverter will switch off braking unit automatically.
If overvoltage stall protection is enabled, inverter will stop deceleration temporarily and
remains output frequency unchanged, and then energy feedback stops. Until DC bus
voltage drops and be lower than lower limit of overvoltage stall voltage, deceleration will
start again. See Figure 7-35 for overvoltage stall protection at deceleration.
The above 2 protections are enabled in all driven modes.