Hitachi SJ Series, User Manual

Page: 239 / 786

12-9-22
Chapter 12 Inverter Function
Control operation in IVMS start mode
• 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
• 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.
Item Parameter Data Description
IVMS carrier frequency [Hd-41]
0.5~16.0(kH
z)
Set the carrier frequency during the IVMS drive.
Filter gain of IVMS
detection current
[Hd-42] 0~1000
The filter adjustment gain applied to the detection
current during the IVMS drive.
Open-phase voltage
detection gain selection.
[Hd-43] 00~04
The adjustment gain applied to the detection
voltage during the IVMS drivel.
Selection of open-phase
switch threshold correction.
[Hd-44]
00 IVMS correction: Disabled (no correction)
01
IVMS correction: Enabled (correction to be
conducted)
Speed control P gain [Hd-45] 0~1000
Speed control P gain during the IVMS drive A larger
value enhances the responsiveness of the speed
control.
Speed control I gain [Hd-46] 0~10000
Speed control I gain during the IVMS drive A larger
value enhances the responsiveness of the speed
control.
Waiting time for
open-phase switching
[Hd-47] 0~1000
Waiting time for the open-phase switching during
the IVMS drive. A larger value enhances the
stability.
Restriction on the
rotation-direction
determination
[Hd-48]
00
Rotation-direction determination: Disabled (no
restriction)
01
Rotation-direction determination: Enabled
(restricted to the operation-command direction)
Adjustment of the timing for
detecting the open-phase
voltage
[Hd-49] 0~1000 Adjustment value of the IVMS detection timing.
Minimum pulse-width
adjustment
[Hd-50] 0~1000
To adjust the width of the voltage pulse during the
IVMS drive. A larger value renders the pulse width
wider.
Current limit of IVMS
threshold
[Hd-51] 0~255
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).
IVMS threshold gain [Hd-52] 0~255 To adjust the IVMS auto-tuning value.
IVMS carrier-frequency
switching start/finish point
[Hd-58] 0~50(%)
To adjust the point where the carrier frequency is
switched in the IVMS start mode.
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