AC70 VC CONTROL FREQUENCY INVERTER MANUAL
FUNCTION PARAMETER DETAILED SPECIFICATION
87
select braking unit or braking accessory if need for other model.
Ratio of dynamic braking:
This parameter defines the average of voltage which applied on the braking resistor
when braking unit effecting. The voltage applied on the braking resistor is PWM wave, the duty cycle is equal to
ratio of dynamic braking. The ratio bigger, energy release faster, the braking effects better, and the same time the
more energy consumes on the braking resistor.
Selecting the braking resistor value, power and braking effects should take comprehensive consideration to set this
parameter.
E-55
DC bus under voltage
protecting value
Range:60%-90% Default:
65%
This parameter defines the DC bus side lower limiter voltage while inverter in normal working condition. It allow to
set under voltage protecting levels lower to ensure inverter normal working for power grid lower situation.
Note: The output torque will be reduced when the power grid voltage is low. For the constant power load
and constant torque load application, the too low power grid voltage will increase input and output current,
which will reduce the inverter ruing reliability.
E-56-E-58 Reserve
E-59
Rotation speed display scale
factor
Range:0.1-2000.0 %
Default:100.0%
It uses to set the display factor of keypad monitor, 100.0% correspond with motor rated speed. The upper limit
machine speed is 65000 RPM.
E-60
Ratio of inverter output
voltage
Range:50%-110% Default:100%
Ratio of output voltage to rated voltage of inverter. This function uses to coordinate the output voltage to meet
various types of V/F characteristic requirement.
Output voltage of inverter = rated voltage of inverter ×Ratio of inverter output voltage
E-61
G/P type setting
Range:0 ,1
Default:0
When reset the factory setting, this parameter setting values will not be changed.
0:G model, it is suitable for constant torque load.
1:P model, it is suitable for variable torque
（
such as fan, water pump load
）
.
The AC70 series frequency inverter adopts G/P in one mode. The power of the motor adaptability used in the
constant torque load (G model) is lower one grade than that used in fan, water pump load (P model
）
E-62
Speed search stability
keeping time
Range:0.20-10.00s
Default:0.600s
This parameter defines the time of inverter try to run stably when inverter detected the frequency point during speed
search process. Inverter accelerates to frequency set point with acceleration time given.
For the big inertia load, extend the speed search stability keeping time can reduce the instantaneous impact current
of speed search start.
