Powtran PI9000 series User Manual page 147

in the current operating frequency, and then continues to ac/decelerate upon the decline of
the output current.
Overcurrent stall gain is used for adjusting inhibition overcurrent capability during
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.
Motor
F8.02
overload
protection
Motor
overload
F8.03
protection
gain
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!
Motor
overload
F8.04
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.
Overvoltage
F8.05
stall gain
Overvoltage
stall
protection
F8.06
voltage
energy
consumption
brake
Prohibit
Allow
0.20 to 10.00
50% to 100%
0 (no overvoltage stall) to 100
120% to 150%(three-phase)
/
Chapter 5 Function parameter
141
0
1
1
1.00
80%
0
130%
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