Omron RX - 2 User Manual Download

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7 Advanced Settings

High-function General-purpose Inverter RX2 Series User’s Manual

7-2 Sele

ction

of Motor Co

ntro

l Meth

7-2
-1

1 Synchronous Motor

(Per

anent Magnet

Motor)

Contro

*1. On the parameter about the current and the voltage, the figures and the units to be handled vary in the setting

path.

1) Operator or CX-Drive: 0.1 A or 0.1 V (When CX-Drive is operated, set [CF-11] Resister data selection to 00

(A,V). When the data of [CF-11] Resister data selection is not set to 00 (A,V), it is not set or displayed correctly.)

2) Modbus: The current and the voltage vary, depending on the setting of Resister data selection [CF-11].

When [CF-11] Resister data selection is set to 00 (A,V), 0.1 A, 0.1 V
When [CF-11] Resister data selection is set to 01 (%), 0.01% (Rated ratio)

3) Drive programming: 0.01% (Rated ratio)

IMPE Mg-pole

position offset,

1st-motor

[Hd137]

0 to 359°

To conduct corrections in a case where the ini-
tial position estimation operation has a certain
error.

DC braking

selection,

1st-motor

[AF101]

Internal DC braking: enabled

DC braking force at

start, 1st-motor

[AF108]

0 to 100(%)

To adjust the DC braking force. Setting of 100%
will provide maximum braking force.

DC braking active

time at start,

1st-motor

[AF109]

0.00 to 60.00

(s)

Enabled during the internal DC braking.
When the operation command is turned ON, DC
braking is started.

0.00

Over current detec-

tion level,

1st-motor

[bb160]

Inverter ND rated

current ×

(0.2 to 2.2)

To Set the level at which the over current is
detected.

2.2 ×

Inverter

rated

current

Phenomenon

Estimated cause(s)

Exemplar measures to be taken

At the start, rotating
temporarily in the
opposite direction to
the intended one.

Misalignment of the
output phases and the
motor’s magnetic-pole
positions

Enable the initial-position estimation function. [Hd132]=01
In the cases of a slight opposite-direction movement even in
the initial-position estimation function, make an adjustment by
incrementing [Hd137] by 5° at a time.

Over current occurs at
the start

• Insufficient starting

torque

• Misalignment of the

output phases and
the motor’s mag-
netic-pole positions

• Enable the initial-position estimation function. [Hd132]=01
• Set the DC braking at the start [AF101] = 01, and after the

start, the time needed for the motor to be stabilized is set in
[AF109].
In addition, make an adjustment by incrementing the braking
force at the start [AF108] by 5% each time.

At the start, the motor
loses synchronization
and no acceleration is
observed.

A long starting time is
required.

A long phase-synchro-
nization time is
required.

When the magnetic-pole positions are synchronized in the DC
braking at the starting, enable the initial-position estimation
function instead of the DC braking at the start. [Hd132]=01

Fluctuating revolu-
tions occur at low
speeds (at the lowest
frequency (switch) or
even lower)

Insufficient starting
torque

Make an adjustment by incrementing the braking force at the
start [AF108] by 5% each time.

Hunting occurs at low
speeds (at the lowest
frequency (switch) or
even lower)

There is a motor con-
stant error.

Decrement the motor constant R [Hd110] little by little until it
reaches a value = set value × 0.7.
Increment little by little each of the motor constant Ld [Hd112]
and the motor constant Lq [Hd112] until they reach their
respective values = set values × 1.4. Note, however that Ld ≤
Lq.

Omron RX - 2, User Manual

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