Hitachi SJ Series, User Manual

Page: 297 / 786

12-11-10
Chapter 12 Inverter Functions
12.11.5 Send Torque from Multiple Motors
• We want to send high torque when operating two
induction motors with one inverter.
• We want to perform high torque multi-operation
control.
• In the case of performing high torque
multi-operation control, connect two motors with
the same specification to one inverter and perform
sensorless vector control (IM).
• Motor constant needs to be set as follows.
Motor base parameter
IM motor constant parameter
Parameter
• In the case of operating different loads on two
motors, the load fluctuation on one motor may
influence the operation status of the other and
cause inappropriate control. Make sure to operate
them with a load that can be considered as one
load.
• See “Chapter 12.9 Select Motor Control Method
Conforming to Motor and Load" for adjustment
method.
Item Parameter Data Description
Motor capacity
selection [Hb102] 0.01~160.00 (kW) Sets a 2-fold capacity of a motor in high torque
multi-operation.
Selection of
number of
motor poles [Hb103] 2 to 48 (poles) Sets the number of poles per motor.
Base frequency [Hb104] 1.00~590.00 (Hz) Sets the base frequency per motor.
Maximum
frequency [Hb105] 1.00~590.00 (Hz) Sets the maximum frequency per motor.
Motor rated
voltage [Hb106] 1~1000 (V) Sets the rated voltage per motor.
Motor rated
current [Hb108] 0.01~10000.00(A) Sets a 2-fold rated current of a motor in high
torque multi-operation.
Item Parameter Data Description
Motor constant
R1 [Hb110] 0.000001~1000.00000
0( Ω )
Sets half of primary resistance of a motor in high
torque multi-operation.
Motor constant
R2 [Hb112] 0.000001~1000.00000
0(
Ω
)
Sets half of secondary resistance of a motor in
high torque multi-operation.
Motor constant
L [Hb114] 0.000001~1000.00000
0(mH)
Sets half of leaked inductance value of a motor
in high torque multi-operation.
Motor constant
I0 [Hb116] 0.01~10000.00(A) Sets a 2-fold non-load current value of a motor
in high torque multi-operation.
Motor constant
J [Hb118] 0.00001~10000.00000
(kgm
2
)
Sets a 2-fold system inertia moment of a motor
in high torque multi-operation.
Item Parameter Data Description
Control
method
[AA121]
08: Sensorless vector control (IM)
09: Sensorless vector control in
zero speed area (IM)
Uses the sensorless vector control
function or sensorless vector control
in the zero speed area.
Q
A
!