Veichi Electric AC60 series Manual page 158

1. V/F curve setup or
torque boost is not
suitable
2. Network voltage is
relatively low;
3. Machine overload
protection parameter
Machine is set improperly；
o.L.1
overload
4.Machine block rotor
operation or heavy
load；
5.Universal
low speed with heavy
load
long time；
1.Heavy load ；
2.Acc time is set too
short；
3.
Frequency
machine in running
o.L.2 inverter
when momentary stop
over load
occurs.；
4. V/F curve setup or
torque boost is not
suitable
1. Reset V/F curve or torque
boost value；
2.Check the input power;
3.Check［E-57］ setting；
4.Adjust load or select and use
frequency
matching capacity grade；
5. When requiring long term low
speed work, please use special
machine
motor for frequency inverter;
works for a
1. Select frequency inverter
with proper capacity;
Restart the 2. Lengthen acceleration time;
3. Restart
completely stop or set［E-30］
as"2" ；
4. Reset V/F curve or torque
boost value；
154
inverter with
after the motor