Hitachi WJ200-001L, Instruction Manual

Page: 191 / 680

3

106
Motor Constants Selection
Adjust the motor constant settings to the motor to be driven by the inverter.
When using a single inverter to drive multiple motors in the control mode based on VC,
VP, or free V/F characteristics, calculate the total capacity of the motors, and specify a
value close to the total capacity for the motor capacity selection (

/

).
When the automatic torque boost function is used, the motor constant settings that do
not match with the motor may result in a reduced motor torque, or unstable motor
operation.
You can select the motor constants that are used when the control mode is the
sensorless vector control (hereafter “SLV”) from the following three types.
(1)
Motor constants of Hitachi standard induction motor
When

/

=

, motor constants in

/

to

/

are taken. The
initial values in

/

to

/

are Hitachi standard motor's values.
(2) Motor constants obtained by off-line auto-tuning
When

/

=

, motor constants in

/

to

/

are taken, which are
obtained by off-line auto-tuning.
(3) Arbitrarily set motor constants
In above (1) and (2) cases, motor constants can be adjusted manually. According to
value of

/

, change motor constants in

/

to

/

or

/

to

/

if necessary.
*1) Convert the inertia (J) to the motor shaft value. Bigger J value will result in a quicker
in motor response and quicker in torque increase. Smaller J value will result in the
opposite way.
*2) In the SLV modes, inverter may give out reverse to given operation command in the
low speed range as a nature of those controls. In case there is a specific inconvenience
for example reverse rotation damages the machine, enable the reverse run protection
(

).