Selecting Control Mode For The Motor And Load; Selection Of Control Mode - Hitachi WJ Series User Manual

Chapter 9

9.5 Selecting Control Mode for the Motor and Load

9.5.1

Selection of Control Mode

 What are the motor control methods available?
Q
 How to set the appropriate control method for the intended application?
 Use "Control mode selection [A044]
A
drive motor and intended application. For details, refer to the table below, and the descriptions
of each control mode provided in the following sections.
Control
mode
Suitable for easy setup and
V/f control
adjustment for conveyors, carts,
Constant
and other motor drive
torque
applications requiring a
characteristics
constant torque.
Suitable for easy setup and
V/f control
adjustment for fans, pumps, and
Reduced
other motor drive applications
torque
that do not require a large
characteristics
torque.
Suitable for applications where
the user is free to set an output
V/f control
voltage relative to the output
frequency, such as for special
Free V/f
motors and other such
applications.
Suitable for applications that
require high torque from low
Sensorless
speeds, and applications that
vector control
require high precision output
frequency.
*1. "2nd-motor control [SET]" target parameter. The second control parameter is also subject to setting.
*2. Automatic energy-saving operation and multi motor drive will be unavailable while using the automatic torque
boost function. In addition, motor constant settings or auto-tuning are required.
*3. This does not function when "2nd-motor control [SET]" is on. This function is only available when using the 1st
motor control mode.
 When using sensorless vector control and automatic torque boost, be sure to set the motor
!
constant for your motor. For details, refer to "8.1.5 Setting Motor Constant" or "8.3 Carrying Out
Motor Auto-tuning ".
 When multiple induction motors (IM) are driven by a single inverter, use V/f control.
 In V/f control, an external encoder provides feedback on the actual motor speed, allowing for
highly accurate and stable speed control. For details, refer to "9.5.5 Motor Operation with V/f
Control with Encoder".
*1 " to set the appropriate control mode according to the
Summary
Applicable
Applicable
Not
applicable
Not
applicable
9-5-1
Automatic
Torque energy-
boost saving
operation encoder
*2
Applicable Applicable
*2
Applicable Applicable
Not
Applicable
applicable
Not Not
applicable applicable
Inverter Functions
V/f
Multi
control
motor
with settings or
drive
auto-tuning
Not
*3 *2
Applicable
required
Not
*3 *2
Applicable
required
Not
*3
Applicable
required
Not
Required
applicable
Motor
constant
*2
*2