Parameter Description
Parameters
68
● When the motor starts or target frequency is adjusted (increasing) under a heavy load, the
motor speed is often unable to follow the output frequency closely. If the motor speed is
lower than the output frequency, the output current will increase to improve the output torque.
However, if the difference between the output frequency and the motor speed is too great,
the motor torque will decrease, a phenomenon known as “stall”.
Parameter
Factory setting
Setting
range
Remarks
22
150%
0~400%
---
23
99999
0~150%,
99999
When P.23=99999, stall prevention
operation level is the set value of P.22.
66
50Hz
0~650Hz
60Hz
P.189=0
220
3
0~3
0
：
according to the current time of
Acc/Dec
1
：
according to the first time of Acc/Dec
2
：
according to the second time of Acc/Dec
3
：
automatically calculate the best time of
Acc/Dec
<Setting>
• During the time when a motor starts or the output frequency increases, the output current of
the inverter will increase. Once the output current exceeds the curve in the diagram below,
the inverter will decrease the output frequency according to the time of Dec of P.220. After
the motor attains the output frequency (at this moment, the output current of the inverter will
decrease accordingly), and accelerates to the original output frequency according to the
time of Acc of P.220 (stall output frequency), then continue to increase the output
frequency.
P.22
Output frequency
Level decreasing
region
100%
Output current
percentage
P.66
(Full load
current)
Level percentage=A+B×
P.22-A
P.22-B
×
P.23-100
B=
100
400
A=
P.66×P.22A
Output frequency
P.66×P.22A
