59
CT / NOCMP Use for constant torque applications that require full overload
capacity at low speeds (see Parameter 17 - MOTOR OL).
23 CARRIER (CARRIER FREQUENCY)
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 efficiency 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 fixed at 1.5 kHz up to 25 Hz output frequency. Above 25 Hz,
the carrier is a fixed 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).
NOTE 2: If the drive is equipped with the High Output Frequency option, and
MAX FRQ is set above 120 Hz, CARRIER will change to 14 kHz, and the
CARRIER parameter will disappear from the parameter menu.
NOTE 3: The ability to operate a drive in the quiet (high carrier frequency) mode
is dependent on the drive horsepower rating, driven load, drive enclosure, and the
ambient temperature. At full 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.
25 START (START MODE)
This parameter selects the starting method for the drive, and can be set for one of
the following:
NORMAL The drive will start when the appropriate contact closure is
made on the terminal strip (in REMOTE mode), or by pressing
the keypad START key (in LOCAL mode). To start the drive
in NORMAL mode, a start command must be issued at least
two seconds AFTER input power is applied.
WARNING!
Automatic start of equipment may result in damage to equipment and/or injury to
personnel! Automatic start should only be used on equipment that is inaccessible
to personnel.
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