Hitachi SJ Series, User Manual

Page: 218 / 786

12-9-1
Chapter 12 Inverter Function
12.9 Select motor control method
in accordance with motor and load
12.9.1 Selection of control mode
• To run the a fan/pump with settings that provide a
better energy-saving effect.
• To change the frequency-voltage characteristics of
a high-speed motor/special motor freely as
intended.
• To run multiple motors with a single inverter.
• Select an appropriate motor control mode for the
motor to be driven and the control method.
• Set [AA121] = 11 or 12 to drive a synchronous
motor (SM)/permanent magnet motor (PMM).
• The characteristics of the control operation may be
improved by automatic tuning.
• Whether the currently-selected mode is the control
mode for induction motors or that for synchronous
motors (SMs)/permanent magnet motors (PMMs)
can be checked by [dC-45]
IM/SM(PMM) monitor
.
Parameter
• To conduct high-torque control of conveyors or the
like without using encoder feedback.
• To conduct high-torque control of cranes and lifts
from 0 Hz without using encoder feedback.
• To control the torque in order to conduct
hit-and-stop control as well as tension control.
• As improper settings for a given motor result in
performance below its potential characteristics, be
sure to set up appropriately.
• See "12.3 Basic Settings for Motor" for checking.
• To drive multiple induction motors (IMs) by a single
inverter, it is recommendable to use it with V/f
control's constant torque characteristics.
• An exemplar selection of control mode will be
shown in the following section. Some of your
systems may have more suitable modes than what
is selected as the example.
* IM : Induction motor
SM (PMM) : Synchronous motor (permanent
magnet motor)
Item Parameter Data Description
Control mode [AA121]
00
V/f control-constant torque characteristics (IM)
01 V/f control-reducing torque characteristics (IM)
02
V/f control-free V/f (IM)
03
Automatic torque boost (IM)
04 V/f control-constant torque characteristics (IM) with sensor
05
V/f control-reducing torque characteristics (IM) with sensor
06
V/f control with sensor-free V/f (IM)
07 Automatic torque boost (IM) with sensor
08
Sensorless vector control (IM)
09 Zero-Hz range sensorless vector control (IM)
10 Vector control (IM) with sensor
11
Synchronous-start type sensorless vector control (SM
(PMM))
12 IVMS-start type
sensorless vector control (SM (PMM))
IM/SM(PMM)
monitor
[dC-45]
00
Induction motor IM being selected.
01
Synchronous motor SM (permanent magnet motor PMM)
being selected.
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