Chapter 5 Function parameter
95
Ch
ap
ter 5
ac/deceleration. The greater this value, the stronger inhibition overcurrent capability Under the
premise that the overcurrent does not occur, the best is the smaller gain setting.
For the small inertia load, the overcurrent stall gain should be small, otherwise which cause
the slower system dynamic response. For the big inertia load, the overcurrent stall gain should be
large, otherwise the poor inhibitory effect may cause overcurrent 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 damage to the
motor due to overheating, it is recommended that the thermal relay 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 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) × rated motor current, if this lasts for 60 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 coefficient
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 product 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(no overvoltage stall) ~100
0
☆
F8.06
Overvoltage stall protection voltage /
energy consumption brake voltage
120%~150%(three-phase)
130%
☆
In the process of the inverter deceleration, when the DC bus voltage exceeds the overvoltage
stall protection voltage/the energy consumption brake voltage, the inverter stops deceleration and
maintains at the current operating frequency(if F3.12 is not set to 0, the braking signal is outputted
the energy consumption brake can be implemented by an external braking resistor.) and then
continues to decelerate upon decline of the bus voltage
Overvoltage stall gain is used for adjusting inhibition overvoltage capability during
deceleration. The greater this value, the stronger inhibition overvoltage capability under the
premise that the overvoltage does not occur, the best is the smaller gain setting.
For the small inertia load, the overvoltage stall gain should be small, otherwise which cause
the slower system dynamic response. For the big inertia load, the overvoltage stall gain should be
large, otherwise the poor inhibitory effect may cause overvoltage fault.
When the overvoltage stall gain is set to 0, the overvoltage stall function will be canceled.
F8.07
Input phase loss
protection
Units
digit
Input phase loss protection selection
11
☆
Prohibit
0
Allow
1
Tens digit Contactor actuation protection
Prohibit
0
Allow
1
The input phase loss protection function is only for
JI500
G type inverter with 18.5kW or
above, not for the F type inverter with 18.5kW or below and however F8.07 is set to 0 or 1.
F8.08
Output phase loss
protection selection
Prohibit
0
1
☆
Allow
1