Pm Motor Drive - Hitachi WJ200-001S Instruction Manual

Ver.22

PM motor Drive

14.1.1 Limitation
There is a limitation in the PM drive. Please note it.
① About the specification
1. Please use for the application of reduced torque with the starting torque less than 50%. In case of use
other than above, or in combination with the motor other than Hitachi standard motor, performance
cannot be guaranteed to be sufficient.
2. It is not suitable for at the usage the constant-torque, the rapid acceleration/deceleration and low speed
driving. Please never use it for the transportation machine, especially the gravity load usage such as
elevators.
3. PM motor cannot be drive by the commercial power source.
4. The motor can drive at load moment of inertia 50 times or less the motor moment of inertia. When over 50
times the motor moment of inertia, you may not be able to obtain adequate motor characteristics.
5. Two or more motors cannot be driven with one inverter.
6. When the DC braking function is used and the inverter trips by over voltage, use a braking resistor.
7. Please let me drive the motor after the brake is released when there is a maintenance brake. The motor
may generate out-of-step if timing is not suitable.
8. When starting, the motor may reverse. Please use the initial magnet position estimation function when
Trouble is caused when reverse run.
9. When you use the inverter to drive a motor of which the rated current of the motor exceeds the rated
current of the inverter, and the capacity is two classes lower than the maximum applicable capacity of the
inverter, you may not be able to obtain adequate motor characteristics.
10. Please adjust the motor constant settings to the motor to be driven by the inverter. The motor constant
data corresponding to the date of one phase of Y connection.
11. When the motor cable for the long (more than 20m as reference) distance, you may not be able to obtain
adequate motor characteristics.
12. Please do not drive the motor that the maximum current of the motor (demagnetization level) falls below
about 300% of the rated current of the inverter. The motor may be demagnetization. Degauss (magnetic
conditioning).
- Please note the effective value and the peak value. The rated current of the inverter in the manual is the
effective value.
13. Please set carrier frequency (b083) 8.0kHz or higher.
14. Please set electric thermal setting (b012) to the rated current of motor (same as H105).
② About the function
1. When the motor rotating at the speed of 50% or less of the base frequency (A003) is used the restarting
with active matching frequency, the motor may restart 0Hz at retry.
2. When use the restarting with active matching frequency, the motor may generate over current trip if the
motor direction of the rotation changes in free running.
3. When use the restarting with active matching frequency at 120Hz or more, generated the over current
trip.
4. When the motor cable for the long (more than 20m as reference) distance if use the restarting with active
matching frequency, the motor may generate over current trip.
Please restart after stopping the motor with the DC braking function or the external brake, etc.
5. A part of function cannot be used. Please refer to other material "14.1.2 Invalid functions" for details.