Instruction manual

46
 Motor constant calculation
Following show an example of motor constant calculation.
Set n106 (motor rated slip), n036 (motor rated current), n107 (Line to
neutral (per phase)) and n110 (motor no-load current) according to the
motor test report.
To connect a reactor between the inverter and the motor, set n108 to the
value of “n108 (motor leakage inductance) initial value plus externally-
mounted reactor inductance.
„
Unless a reactor is connected, n108 (motor
leakage inductance) does not have to be set according to the motor.
(1) Motor rated slip (n106)
120 × motor rated frequency (Hz)*
1
Number of motor pole
– Motor rated speed (r/min)*
2
120 / Number of motor pole
=
*1 Base frequency (Hz) during constant output control
*2 Rated speed (r/min) at base frequency during constant output control
(3) Motor rated current (n036)
= Rated current at motor rated frequency (Hz)*
1
(A)
Calculations are based on line-to-line resistance and insulation grade
of the motor test report.
(E type insulation) Test report of line-to-line resistance at 75°C (Ω) × 0.92 ×
(B type insulation) Test report of line-to-line resistance at 75°C (Ω) × 0.92 ×
(F type insulation) Test report of line-to-line resistance at 115°C (Ω) × 0.87 ×
(2) Line to neutral (per phase) (n107)
× 100 (%)
(4) Motor no-load current (n110)
=
No-load current (A) at motor rated frequency (Hz)*
1
Rated current (A) at motor rated frequency (Hz)*
1
2
1
2
1
2
1
n113 Setting
Select slip compensation status during regeneration:
0
1
Slip correction during regenerative operation
Disabled
Enabled