Hitachi SJ Series, User Manual

Page: 240 / 786

12-9-23
Chapter 12 Inverter Function
• In this control mode, operations of magnetic-pole
position estimation, IVMS start control, and
sensorless 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.
Parameters common to this mode and the
synchronous starting mode
• In the case of starting after the magnetic-pole
position estimation, estimation operation is
conducted at the start by setting the start method
[Hd132] at 01.
• In the case of the start method [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.
Item Parameter Data Description
Control mode [AA121] 12
To use IVMS-start type sensorless vector control
(SM/PMM)
Speed response [HA115] 0~1000(%)
To adjust the responsiveness of the control.
A larger value enhances the responsiveness.
SM(PMM) lowest
frequency (switch)
[Hd130] 0~50(%)
The frequency at which the sensorless vector
control is started.
Set the ratio to the base frequency [Hd104].
SM(PMM) no-load
current
[Hd131] 0~100(%)
Set the ratio of the no-load current to the rated
current during the sensorless vector control.
SM(PMM) start method [Hd132]
00 Initial position estimation is disabled.
01 Initial position estimation is enabled.
SM(PMM) initial position
estimation zero-V
stand-by times
[Hd133] 0~255
This is a stand-by adjustment value to stabilize
the reference value for the initial position
estimation detection.
SM(PMM) initial position
estimation detection
stand-by times
[Hd134] 0~255
This is an adjustment value to stabilize the
current rise of the initial position estimation
operation.
SM(PMM) initial position
estimation detection
times
[Hd135] 0~255
This is a detection-operation adjustment value of
the initial position estimation operation.
SM(PMM) initial position
estimation voltage gain
[Hd136] 0~200(%)
This is a output-voltage adjustment gain of the
initial position estimation operation.
SM(PMM) initial position
estimation magnetic-pole
position offset
[Hd137] 0~359(°)
To conduct corrections in a case where the initial
position estimation operation has a certain error.
DC braking selection [AF101] 01 Internal DC braking: enabled
DC braking force at the
start
[AF108] 0~100(%)
To adjust the DC braking force. Setting of 100%
will provide maximum braking force.
DC braking time at the
start
[AF109] 0.0~60.0(s)
Enabled during the internal DC braking.
When the operation command is turned ON, DC
braking is started.
Over current detection
level
[bb160]
Inverter ND
rated current
×
(0.20 to 2.20)
To Set the level at which the over current is
detected.
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