Lenze MCH Series Manual do Utilizador descarregar pdf (Página 58)

54 13435744_EDBMH01_v13

OUTPUT FREQUENCY (Hz)

OUTPUT VOLTAGE (%)

FIXED BOOST

CONSTANT V/Hz

20 30

40 50 60

100

22 TORQUE (TORQUE CURVE SELECTION)

This parameter is used to select whether the output of the drive follows a constant or

variable V/Hz curve. The following selections are available:

CONSTANT Use for constant torque applications to optimize torque.

VARIABLE Use for variable torque applications to optimize energy savings.

CONST / NO COMP Use for constant torque applications that require full overload

capacity at low speeds (Refer to Parameter 17 - MOTOR OL).

23 CARRIER FREQ

This parameter sets the carrier frequency or switching frequency of the output IGBT’s.

Higher switching rates result in less audible noise to be emitted from the motor, but

the eciency of the drive decreases as the carrier frequency increases. Therefore,

this parameter should be set to the lowest value which yields acceptable sound levels.

Available settings are: 2.5 kHz, 6 kHz, 8 kHz, 10 kHz, 12 kHz and 14 kHz.

NOTE 1: The 2.5 kHz carrier frequency setting is a variable carrier. The carrier

frequency remains xed at 1.5 kHz up to 25 Hz output frequency. Above 25

Hz, the carrier is a xed multiple of 60 times the drive’s output frequency.

For example, if the output frequency of the drive was set to 45 Hz, the

carrier frequency would be 2.7 kHz (45 Hz x 60 = 2700 Hz). The other

settings are constant carriers that remain xed for the entire speed range.

NOTE 2: The ability to operate a drive at higher carrier frequencies is dependent

on the drive horsepower rating, driven load, drive enclosure and the

ambient temperature. Operation above 8kHz requires derating the drive

by multiplying the output current rating by the following factors: 0.94 at 10

kHz, 0.89 at 12 kHz, and 0.83 at 14 kHz.

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Lenze MCH Series Manual do Utilizador Página 58