Lenze MC3000 Series - Manual (Page 56)

52 13435743_EDBM301_v14 .0
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) . The other settings are
constant carriers that remain fixed 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 .
25 START (START MODE)
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 .
This parameter selects the starting method for the drive, possible settings are:
NORMAL The drive will start when the appropriate contact closure is made
on the terminal strip (REMOTE mode), or by pressing the keypad
START key (LOCAL mode) . To start the drive in NORMAL mode,
a start command must be issued at least two seconds AFTER
input power is applied .
POWER UP The drive will automatically start upon application of input power .
The drive MUST be set up for a two-wire start/stop circuit (refer to
Section 14 - CONTROL WIRING), and the start command MUST
be present when power is applied for this function to operate .
AUTO 1 FLYING AUTO RESTART - LOW performance . Synchronization
in approximately 6 seconds with current levels up to 50%
of the drive rating . This setting results in a slow, smooth
synchronization .
AUTO 2 F LY I N G A U T O R E S TA R T - M E D I U M p e r f o r m a n c e .
Synchronization in approximately 1 second with current
levels up to 50% of the drive rating . This setting allows faster
synchronization while retaining smoothness .
AUTO 3 FLYING AUTO RESTART - HIGH performance . Synchronization
in approximately 1 second with current levels up to 100% of the
drive rating . This setting allows the fastest synchronization, but
sacrifices smoothness .
The AUTO 1 - 3 settings allow the drive to start into a spinning load after a fault or upon
application of input power . As with POWER UP, the drive MUST be set up for two-wire
start/stop control and the start command MUST be present after a fault or when power
is applied for this function to operate .