Lenze TCF Series - Manual (Page 59)

P83 CURRENT LOOP I GAIN
Normally, this parameter should not require adjustment . In special cases, however, it
may need to be adjusted to optimize performance . Do not change this parameter without
consulting Lenze-AC Tech .
P84
MOTOR STATOR RESISTANCE
This will be automatically adjusted when the AUTO CALIBRATION (Parameter 81) function
is performed . Once the AUTO CALIBRATION function is performed, this setting should not
be changed .
P85
MOTOR RATED SPEED
Enter the motor's nameplate RPM rating .
P86
MOTOR RATED CURRENT
Enter the motor's nameplate full-load current rating .
P87
MOTOR RATED VOLTAGE
Enter the motor's nameplate voltage rating . If the motor is dual-rated, enter the voltage that
matches the supply voltage being used .
P88
MOTOR BASE FREQUENCY
Enter the motor's nameplate frequency .
P91
MOTOR COSINE PHI (POWER FACTOR)
Use the following formulas to determine the appropriate value to enter, depending on the
available motor data:
1 . If the motor's power factor is known, simply enter that value .
2 . If the motor's magnetizing current is known:
COS F = COS
[
SIN -1
(
Magentizing Current
)]
Motor Current
Example 1: A motor has a full-load current rating of 8 amps and a magnetizing current of 4
amps . Using the above formula yields a result of 0 .87:
4/8 = 0 .5
sin -1 (0 .5) = 30
cos (30) = 0 .866 = 0 .87
3 . If the motor's power factor or magnetizing current is not available, but the
efficiency is known:
COS F =
Motor HP X 746
Motor Efficiency X Motor Voltage X Motor Current X 1 .732
Example 2: A 10 Hp 460 Vac motor has an efficiency of 85% and a full-load current rating
of 13 amps . Using the formula above yields a result of 0 .85:
10 X 746 = 7460
0 .85 X 460 X 13 X 1 .732 = 8804
7460/8804 = 0 .847 = 0 .85
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