Omron VARISPEED G7 Instruction Manual page 301

Manual Motor Constant Setting Methods
The motor constants settings methods are given below. Make (enter) settings referring to the motor test report.
Motor Rated Voltage Setting
Set E2-01 to the rated current on the motor nameplate.
Motor Rated Slip Setting
Set E2-02 to the motor rated slip calculated from the number of rated rotations on the motor nameplate.
Amount of motor rated slip = Motor rated frequency (Hz) - No. of rated rotations (min
poles/120.
Motor No-Load Current Setting
Set E2-03 to the motor no-load current using the rated voltage and rated frequency. The motor no-load current
is not normally written on the motor nameplate. Consult the motor manufacturer.
Factory setting is the no-load current value for a standard Yaskawa 4-pole motor.
Number of Motor Poles Setting
E2-04 is displayed only when V/f control method with PG is selected. Set the number of motor poles (number
of poles) as written on the motor nameplate.
Motor Line-to-Line Resistance Setting
E2-05 is set automatically when performing motor
ing, consult the motor manufacturer for the line-to-line resistance value. Calculate the resistance from the line-to-line resis-
tance value in the motor test report using the following formula, and then make the setting accordingly.
E-type isolation: [Line-to line resistance (Ω) at 75°C of test report] × 0.92 (Ω)
•
B-type isolation: [Line-to line resistance (Ω) at 75°C of test report] × 0.92 (Ω)
•
F-type isolation: [Line-to line resistance (Ω) at 115°C of test report] × 0.87 (Ω)
•
Motor Leak Inductance Setting
Set the amount of voltage drop due to motor leak inductance in E2-06 using the percentage over the motor
rated voltage. Make this setting when the high-speed motor inductance is small. If the inductance is not writ-
ten on the motor nameplate, consult the motor manufacturer.
Motor Iron Saturation Coefficients 1 and 2 Settings
E2-07 and E2-08 are set automatically using autotuning.
Motor Iron Loss for Torque Compensation Setting
E2-10 is displayed only when in V/f control method. To increase the torque compensation accuracy when in
V/f control method, set the motor iron loss in Watts.
Motor Mechanical Loss
When using flux vector control, adjust mechanical loss in the following cases. (There is normally no reason to
make this adjustment.) The mechanical loss setting is used to compensate the torque.
There is excessive torque loss from the motor bearings.
•
There is excessive torque loss from a fan, pump, etc.
•
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6
line-to-line resistance autotuning. When you cannot perform tun-
−1
) x No. of motor