Hitachi SJ Series User Manual page 239

Chapter 12
Control operation in IVMS start mode
Ａ
• 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.
Parameters for IVMS start mode
Item
IVMS carrier frequency
Filter gain of IVMS
detection current
Open-phase voltage
detection gain selection.
Selection of open-phase
switch threshold correction.
Speed control P gain
Speed control I gain
Waiting time for
open-phase switching
Restriction on the
rotation-direction
determination
Adjustment of the timing for
detecting the open-phase
voltage
Minimum pulse-width
adjustment
Current limit of IVMS
threshold
IVMS threshold gain
IVMS carrier-frequency
switching start/finish point
Parameter Data
0.5~16.0(kH
[Hd-41]
z)
[Hd-42] 0~1000
[Hd-43] 00~04
00
[Hd-44]
01
[Hd-45] 0~1000
[Hd-46] 0~10000
[Hd-47] 0~1000
00
[Hd-48]
01
[Hd-49] 0~1000
[Hd-50] 0~1000
[Hd-51] 0~255
[Hd-52] 0~255
[Hd-58] 0~50(%)
12-9-22
！
• Some SM (PMM) may be unable to start in the
IVMS start mode.
• IVMS start mode is a control mode that requires a
strict adjustment. Please contact the sales officer of
our company if your motor cannot start.
• IVMS start mode requires a re-adjustment when the
inverter is replaced. When a malfunctioning inverter
needs to be restored immediately by replacing the
malfunctioning inverter with a new one, the
synchronous starting mode should be used.
• As the IVMS start mode is a very special control,
which may make a unique operation sound as the
starting sound.
Description
Set the carrier frequency during the IVMS drive.
The filter adjustment gain applied to the detection
current during the IVMS drive.
The adjustment gain applied to the detection
voltage during the IVMS drivel.
IVMS correction: Disabled (no correction)
IVMS correction: Enabled (correction to be
conducted)
Speed control P gain during the IVMS drive A larger
value enhances the responsiveness of the speed
control.
Speed control I gain during the IVMS drive A larger
value enhances the responsiveness of the speed
control.
Waiting time for the open-phase switching during
the IVMS drive. A larger value enhances the
stability.
Rotation-direction determination: Disabled (no
restriction)
Rotation-direction determination: Enabled
(restricted to the operation-command direction)
Adjustment value of the IVMS detection timing.
To adjust the width of the voltage pulse during the
IVMS drive. A larger value renders the pulse width
wider.
Set a limit on each of the upper and the lower limits
of the detection current during the IVMS drive.
Enabled when [Hd-44] = 01 (enabled).
To adjust the IVMS auto-tuning value.
To adjust the point where the carrier frequency is
switched in the IVMS start mode.
Inverter Function