Hitachi J300 Series Instruction Manual page 135

Operation conditions
No.
Parallel motor operation Operation cannot be started at high
5
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Phenomena
torque, since the inverter does not
know the load sharing of the
motors.
NOTE: The setting methods shown below
Improvements
apply to DOP and DRW operations.
1. When sensor-less vector control is selected
Function mode
• F-04
CONTROL SLV VC
Reset to V/f control.
Select the motor capacity which is the most approxi-
mate to the total capacity of the motors used.
(For example, 7.5 kW, 5.5 kW, and 3.7 kW.)
Function mode
Total capacity of the motors: 7.5 + 5.5 + 3.7 = 16.7kW
• F-05
AUX K 022.00 kW 015.00 kW
Select the most approximate value
to the total capacity.
If two or more motors are changed in operation,
select the most approximate value to the motor
capacity.
Example 1: One 5.5 kW motor is used
• F-05
AUX K 022.00 kW 005.50 kW
Select the most approximate value.
Example 2: One 5.5 kW motor is changed into
parallel operation of four 5.5 kW motors
Total capacity of the motors: 5.5 × 4 = 22.0 kW
• F-04
AUX K 005.50 kW 022.00 kW
Select the most approximate value.
Display, etc.
12.3 Function mode
F-04 (P.12-5)
A 1
The sensor-less vector
control is not applicable
to multi-motor parallel
operation.