Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 61)

PARAMETER AND VARIABLE DESCRIPTIONS 6-5
1557-UM050F-EN-P – June 2013
Capacitor Frequency [Capacitor freq]
Linear number :
28
Minimum value: 50 Hz
Maximum value: 60 Hz
Default value: 60 Hz
This parameter specifies the rated nameplate frequency of the motor filter capacitors (50 Hz or 60 Hz). This
parameter has been included to eliminate the requirement to recalculate the capacitor kvar when the capacitor
rated frequency is not the same as line frequency.
Rated Motor Volts [Rated motor volt]
Linear number:
22
Minimum value: 1000 V
Maximum value: 7200 V
Default value: 2300 V
This parameter specifies the rated line to line voltage of the motor. It is used along with the known divider ratios
of the voltage feedback boards to calculate the motor voltage feedback scaling. 1.0 per unit voltage is defined
as equal to this parameter.
The motor rated voltage should be specified as 2300/4000V and not 2400/4160V to ensure that the line voltage
is slightly higher than the motor voltage. Since the motor voltage is limited by the line voltage, increasing the
motor rated voltage in an attempt to get more out of the drive will only force the drive to go into field weakening
at a lower speed.
Rated Motor Amps [Rated motor amps]
Linear number:
23
Minimum value: 10 A
Maximum value: 1000 A or 1400 A (FRN 5.30)
Default value: 60 A
This parameter specifies the rated full load current of the motor. 1.0 per unit current is defined as equal to this
parameter multiplied by the service factor parameter. If, as often happens, the motor rated current for a service
factor of 1.0 is entered, and it is later determined that the motor is undersized and it is necessary to operate at
a higher service factor, it is better to change the service factor parameter instead of this parameter. Changing
the motor rated current changes the base impedance of the motor, meaning that the drive must be retuned.
Rated Motor kw [Rated motor kw]
Linear number:
24
Minimum value: 30 kw
Maximum value: 7500 kw or 10000 kw (FRN 5.30)
Default value: 187 kw
This parameter specifies the rated power of the motor. This parameter and the following parameter are actually
the same parameter with different scaling. Either parameter may be set and the other will automatically change
to the corresponding value in the alternative units.
Rated Motor hp [Rated motor hp]
Linear number:
25
Minimum value: 40 hp
Maximum value: 10000 hp or 13400 hp (FRN 5.30)
Default value 250 hp
This parameter specifies the rated power of the motor. This parameter and the preceding parameter are
actually the same parameter with different scaling. Either parameter may be set and the other will automatically
change to the corresponding value in the alternative units.