Omron RX - 2, Руководство пользователя

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7 Advanced Settings
7 - 6 High-function General-purpose Inverter RX2 Series User’s Manual
 Parameter
Suitable for applications, such as a fan/pump, that require no large torque at a low-speed range.
As the output voltage is low at a low-speed range, improved efficiency, lower noise, and less vibration
can be expected.
Period a: Constant torque characteristics are employed for a period from 0 Hz to the frequency that is
10% of the base frequency. (e.g.) A 60-Hz base frequency yields constant torque characteris-
tics for a range from 0 to 6 Hz.
Period b: Reducing torque characteristics are employed for a period from the frequency that is 10% of
the base frequency to the base frequency. For a given frequency, the voltage on the curve of
the 1.7th power to the given frequency is outputted.
Period c: The voltage has constant-output characteristics for a range from the base frequency to the
maximum frequency.
Precautions for Correct Use
When a motor is hunting and vibrating, an adjustment of the stabilization constant, 1st-motor
[HA110] may improve the state of the motor.
Item Parameter Data Description
Default
data
Control mode
selection, 1st-motor
[AA121] 00
To be used with the V/f control and
the constant torque characteristics
(IM).
00
Stabilization con-
stant, 1st-motor
[HA110] 0 to 1000(%)
To adjust the control for reducing the
hunting of motors.
100
Async.Motor Base
frequency setting,
1st-motor
[Hb104]
10.00 to the maximum fre-
quency (Hz)
To set the base frequency of motors.
50
*1
*1. Default data when default data selection (UB-02) is set to 01.
Async.Motor Maxi-
mum frequency set-
ting, 1st-motor
[Hb105]
Base frequency to 590.00
(Hz) To set the maximum frequency of
motors.
50
*1
Async.Motor rated
voltage, 1st-motor
[Hb106] 1 to 1000 (V) Set the rated voltage of motors.
200V:
230
*1
400V:
400
*1
7-2-2 V/f Control (Reducing Torque Characteristics)
0
a
b
c
Output voltage (V)
Rated
voltage
Base
frequency Maximum
frequency
Command frequency
(Hz)
Proportional
1.7th power
(f
1.7
)
10% of the
base frequency