Chapter 5 Function parameter
38
Ch
ap
ter
5
large,otherwise the poor inhibitory effect may cause over current fault.
When the overcurrent stall gain is set to 0,the overcurrent stall function will be canceled.
F8.02 Motor overload protection
prohibit
0
1
☆
allow
1
F8.03 Motor overload protection gain
0.20~10.00
1.00
☆
F8.02=0: no motor overload protection function,there may be the risk of the demage to the
motor due to overheating,it is recommend that the thermal is installed between the inverter and the
motor;
F8.02=1: the inverter will determine whether the motor is overloaded or not according to the
inverse time curve of the motor overload protection.Inverse time curve of motor overload
protection:220% X (F8.03)X rated motor current,if this lasts for 1 second,the alarm of motor will
be prompted overload fault;150%X(F8.03)X rated motor current,if this lasts for 30 seconds, the
alarm of motor overload will be prompted.
User shall correctly set the value of F8.03 according to the Actual motor
Overload capacity,if the value is set to too large,which may easily lead to motor overheating
and damage while the inverter will not alarm!
F8.04
Motor overload pre-alarm co-
effcient
50%~100%
80%
☆
This function is used in the front of motor overload fault protection,and sends a pre-alarm
signal to the control system by DO, the warning coefficient is used to determine the extent of pre-
alarm prior to motor overload protection.The higher the value, the smaller the extent of pre-alarm
in advance.
When the cumulative amount of inverter output current is greater than the products of the
inverse time curve of overload and F8.04,the inverter multi-function digital DO will output “motor
overload pre-alarm” on signal.
F8.05 Overvoltage stall gain
0(Stall without overpressure)~100
0
☆
F8.06
Stall protection voltage / energy
dissipation braking voltage
120%~150%( Three-phase)
130%
☆
In the process of deceleration when the inverter, the DC bus voltage over voltage stall
protection / braking voltage, inverter stop deceleration remain in the current operating frequency
(F3.12 = 0, while the output signal by an external brake, braking resistor implement energy
brake. ) continue to slow down after the bus voltage drops.
The overvoltage stall gain is used to adjust the ability of the converter to suppress the
overvoltage during the deceleration process. The greater the value, the better the ability to suppress
the overpressure. The smaller the gain setting, the better the condition is that no overvoltage
occurs.
For small inertia loads, the overvoltage stall gain should be small, otherwise the dynamic
response of the system will be slower. For large inertia load, this value should be large, otherwise
the suppression effect is not good, overvoltage fault may occur.
The overvoltage stall function is reversed when the overvoltage stall gain is set to 0.
F8.08 Out of phase protection
prohibit
0
1
☆
allow
1
Select whether the output phase is protected.
F8.09
Ground to ground short-circuit
protection
invalid
0
1
☆
effective
1
Frequency converter can be selected to check whether the motor is shorted to ground.
If this function is valid, the converter U, V, and W will have voltage output for a period of
time after power on.
Summary of Contents for PI500-S 004G1
Page 4: ......
