Omron RX Series - Motor Parameter Settings

6 Vector Control
6 - 24
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• This function provides compensation for suppressing the variation of the rotation speed due to
temperature changes in the motor. It is enabled when sensorless vector control, 0-Hz sensorless
vector control, or sensor vector control is selected as the control method. Use the thermistor PB-41E
(from SHIBAURA ELECTRONICS).
• To use this function, set the Thermistor Selection (b098) to 02 (NTC). Other thermistor settings do
not provide correct temperature detection.
• To use the sensorless vector control, 0-Hz sensorless vector control, or sensor vector control
method, you need to set the motor parameters. Normally, perform offline auto-tuning to determine the
motor parameter values.
• Set the motor parameters manually if the offline auto-tuning process is aborted, for example, if the
inverter does not reach 50% of the rated current during auto-tuning.
• Set the 1st Motor Parameter selection (H002) to 00 (Standard motor parameter).
By default, the inverter is set to use the motor parameter values for typical general-purpose motors.
To maximize the performance of the vector control, adjust each parameter value according to your
motor.
• Obtain the motor’s datasheet from the motor manufacturer to set the motor parameters.
The following values must be set as 50-Hz data for one phase in 3-phase Y-connection.
Secondary Resistance Compensation Function (Temperature
Compensation)
Parameter No. Function name Data Default data Unit
P025
Secondary Resistance
Compensation Selection
00: Disabled
01: Enabled
00 –
6-3-5 Motor Parameter Settings
Winding resistance on primary side of motor: Set the wiring resistance (in Ω) on the primary
side of the motor for one phase in Y-connection.
Winding resistance on secondary side of motor: Set the wiring resistance (in
Ω) on the secondary
side of the motor for one phase in Y-connection.
Motor leakage inductance: Set the motor leakage inductance (in mH) in
Y-connection.
Motor no-load current: Set the no-load current of the motor, or set the
current value measured when the motor rotates
with no load at 50 Hz.
Moment of inertia: Add the moment of inertia of the motor and that of
the load and set the motor-shaft conversion of the
sum.