Powtran PI9000-S Series User Manual page 46

Chapter5.Function parameter
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
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
Overvoltage stall protection
F8.06
voltage
consumption brake voltage
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.
F8.08 Output phase loss protection
selection
Select whether the output phase loss protection is done or not.
F8.09 Power-on short circuit to
ground
You can detect whether the motor is shorted to ground when the inverter is powered
on.
If this function is active, the inverter's UVW terminal will output voltage after power-
on for a while.
F8.10 Number of automatic fault
reset
50% to 100%
0 (no overvoltage stall) to 100
120% to 150%(three-phase)
/ energy
Prohibit
Allow
Invalid
0 to 32767
Valid
42
☆
80%
☆
0
☆
130%
0
☆
1
1
0
☆
1
1
☆
32767