Omron RX - 2, Руководство пользователя

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7 Advanced Settings
7 - 26 High-function General-purpose Inverter RX2 Series User’s Manual
Precautions for Correct Use
• When the revolution of the motor is hindered by such causes as the braking or the motor lock
caused by foreign objects, such hindrance may cause over current, loss of synchronization,
or the like. When no such adjustment as ones mentioned above improves the state, checking
the portion around the motor may sometimes improves it.
• If an application of load results in a great amount of change in the inverter’s output frequency
monitor [dA-01], a function to automatically change the frequencies for the overload limiting
function, the momentary-stop non-stop function, the over voltage suppression function may
work depending upon the settings of the functions.
In this control mode, operations of magnetic-pole position estimation, IVMS start control, and sensor-
less vector control are started in this order.
In this control mode, only the parameters set by the first set-up are enabled. Terminal [SET] cannot be
used.
In the magnetic-pole position estimation, it is possible to select whether the motor is started after the
motor’s magnetic-pole positions are estimated by use of the initial-position estimation function or the
magnetic-pole positions are synchronized by use of the DC braking function.
In the case of starting after the magnetic-pole position estimation, estimation operation is conducted at
the start by setting the Starting Method for Sync.M, 1st-motor [Hd132] at 01.
In the case of the Starting Method for Sync.M, 1st-motor [Hd132] being set at 00, the magnetic poles
are positioned to the output phases at the start. As a large offset between the magnetic poles and the
output phases may fail the starting, use the starting-time DB to synchronize the magnetic-pole positions
and the output phases before the starting.
IVMS start mode is a start mode where larger torque is provided than in the synchronous starting mode.
When the synchronous starting mode provides an insufficient torque, use of the IVMS start mode may
improve the performance.
Use of the IVMS start mode requires an SM(PMM) constant that is set by the sensorless vector control
and an adjustment dedicated for IVMS start mode.
Before the motor drive, conduct an IVMS auto-tuning and a test run with the load removed.
Hunting occurs at
higher speeds (at the
lowest frequency
(switch) or higher).
Unsynchronized speed
response. Make an adjustment by incrementing/decrementing the speed
response [HA115] by 5% each time.
Distorted wave form of
the radio wave. Make an adjustment by incrementing the no-load current
[Hd131] by 5% each time.
A long initial position
estimation time is
required.
Set value for the esti-
mation is too large.
Lower the values [Hd133] to [Hd135] by the same ratio.
Note Too low a value may result in an operation in the oppo-
site direction.
A movement in the
opposite direction
occurs while the initial
position estimation is
being used.
The estimation is
improperly conducted. Raise the values [Hd133] to [Hd135] by the same ratio, or
raise the voltage gain [Hd136] by 5% each time.
While the initial posi-
tion estimation is being
used, over current
errors may occur.
Voltage gain is too
high.
Decrement the voltage gain [Hd136] by 5% each time.
Frequency-synchro-
nized re-start may
cause errors. Too high revolution
speeds and too large
offset of the phases. Make an adjustment by incrementing the speed response
[HA115] by 5% each time. Waiting a longer time for the re-start
may improve the situation.
IVMS Start Sensorless Vector Control (SM/PMM)
Phenomenon Estimated cause(s) Exemplar measures to be taken