9-78
P06
Motor 1 (No-load current) P12 (Motor 1, Rated slip frequency)
A20 (Motor 2, No-load current)
P07 Motor 1 (%R1) A21 (Motor 2, %R1)
P08 Motor 1 (%X) A22 (Motor 2, %X)
P06 through P08 and P12 specify no-load current, %R1, %X, and rated slip frequency,
respectively. Obtain the appropriate values from the test report of the motor or by calling the
motor manufacturer.
Performing auto-tuning automatically sets these parameters.
No-load current (P06)
Enter the value obtained from the motor manufacturer.
%R1 (P07)
Enter the value calculated by the following expression.
(%) 100×
)I×3(/V
R1CableR1
%R1
+
=
where,
R1: Primary resistance of the motor (Ω)
Cable R1: Resistance of the output cable (Ω)
V: Rated voltage of the motor (V)
I: Rated current of the motor (A)
%X (P08)
Enter the value calculated by the following expression.
(%) 100×
)I×3(/V
XCableXM)(X2/XM×X2X1
%X
+++
=
where,
X1: Primary leakage reactance of the motor (Ω)
X2: Secondary leakage reactance of the motor (converted to primary) (Ω)
XM: Exciting reactance of the motor (Ω)
Cable X: Reactance of the output cable (Ω)
V: Rated voltage of the motor (V)
I: Rated current of the motor (A)
Rated slip frequency (P12)
Convert the value obtained from the motor manufacturer to Hz using the following
expression and enter the converted value. (Note: The motor rating given on the nameplate
sometimes shows a larger value.)
(Synchronous speed - Rated speed)
Rated slip frequency (Hz) =
Synchronous speed
x Base frequency
For reactance, choose the value at the base frequency 1 (F04).
To Next Page
Loading...
