Chapter 6 - Parameter Description [FU2]
6-29
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 of other
inverter parameters. (See motor nameplate)
This parameter is only displayed when ‘Slip
Compen’ is selected in FU2-60 [Control Method].
If this value is not right, check the current after
operating in V/F mode without load connected and
enter that current value.
Note: make sure to use correct value for FU2-44
[Motor No-load Current]. Otherwise, Sensorless
performance may be degraded.
Note: Preset motor parameters may differ with
user motors. In this case, enter the nameplate
value of your motor to the corresponding
parameters. If motor rating exceeds inverter
capacity, unsatisfactory control performance may
result because all other control parameters follow
inverter capacity.
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 correctly. Install a DB unit or
regenerative converter to improve the performance.
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.
Motor rated slip freq [Hz]=(Rated input freq. [Hz] –
(Motor rpm * P/120)
P: Number of motor poles
(Ex) In the case of 60Hz, 4 pole, 1730 rpm motor
Motor rated slip freq [Hz]= (60[Hz]-(1750[rpm] * 4/120))
=60[Hz]-58.67[Hz]=1.33[Hz]
FU2-47: Gain for Motor Speed Display
This code is used to change the motor speed display
to rotating speed (r/min) or mechanical speed
(m/min). The display is calculated by following
equation.
Rotating speed (r/min) = 120 * F / P,
Where, F=Output frequency, P= motor pole number
Mechanical speed (m/min) = Rotating speed * Motor
RPM Display Gain [FU2-47]
FU2-48: Carrier Frequency
FU2
►
Rated-Curr
43 19.7 A
19.7
43
Factory Default: 19.7 A 19.7
(This value is set according to the motor capacity set in
FU2-40)
FU2
►
Noload-Curr
44 6.6 A
6.6 44
Factory Default: 6.6 A 6.6
(This value is set according to the motor capacity set in
FU2-40
FU2
►
Carrier freq
48 5.0 kHz
5.0 48
Factory Default: 5.0 kHz 5.0
Factory Default: 86 % 86
(This value is set according to the motor capacity set in
FU2-40)
Factory Default: 0 0
FU2
►
RPM factor
47 100 %
100 47
Factory Default: 100 % 100
FU2
►
Inertia rate
46 0
0 46
FU2
►
Efficiency
45 86 %
86 45
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