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Chapter 4 - Parameter Description [FU2]
55
If you know the motor parameters, set the values
in the relevant codes for better control
performance.
(This value is set according to the model number before shipping)
This is used to display the motor speed. If you set
this value to 2, inverter will display 3600 rpm
instead 1800rpm at 60Hz output frequency. (See
motor nameplate)
This is used in ‘Slip Compensation’ control. If you
set this value incorrectly, motor may stall during
slip compensation control. (See motor nameplate)
This is very importance parameter that must be
set correctly. This value is referenced in many
other inverter parameters. (See motor nameplate)
This parameter is only displayed when ‘Slip
Compen’ is selected in FU2-40 [Control Method].
This function is used to maintain constant motor
speed. To keep the motor speed constant, the
output frequency varies within the limit of slip
frequency set in FU2-32 according to the load
current. For example, when the motor speed
decreases below the reference speed (frequency)
due to a heavy load, the inverter increases the
output frequency higher than the reference
frequency to increase the motor speed. The
inverter increases or decreases the output by
delta frequency shown below.
Output frequency = Reference freq. + Delta freq.
This value is used for calculating the output
wattage when FU2-72 is set to ‘Watt’.
This parameter is used for sensorless control,
minimum Accel/Decel, optimum Accel/Decel and
speed search. For better control performance, this
value must be set as exact as possible.
Set ‘0’ for loads that has load inertia less than 10
times that of motor inertia.
Set ‘1’ for loads that have load inertia about 10
times that of motor inertia.
FU2-39: Carrier Frequency
This parameter affects the audible sound of the
motor, noise emission from the inverter, inverter
temperature, and leakage current. If the ambient
temperature where the inverter is installed is high
or other equipment may be affected by potential
inverter noise, set this value lower.
This is also used to avoid an induced resonance
in the machine or motor.
☞
Note: If this value must be set higher than 3 kHz, derate the
load current by 5% per 1 kHz.
Delta
Freq.
=
Output current – No load
Rated current – No load
Rated Slip
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