Mitsubishi Electric 800 Series Instruction Manual page 95

4.3
Selecting the PM sensorless vector control
PM PM PM
 Initializing the parameters required for the PM sensorless vector control
(Pr.998)
• Use PM parameter initialization to set the parameters required for driving a PM motor.
• Perform offline auto tuning before setting Pr.998. (Refer to
• All the parameters required for PM motor control are automatically set by setting Pr.998 ≠ "0".
Pr. Name
998 PM parameter
E430 initialization
• To use a motor capacity that is one rank lower than the inverter capacity, set Pr.80 Motor capacity before performing PM
parameter initialization.
• When "8009 or 9009" is set in Pr.998, the motor speed which was set/monitored in frequencies is set/monitored in motor
rotations per minute. To use frequency to display or set, set Pr.998 = "8109 or 9109".
• Set Pr.998 = "0" to change the PM sensorless vector control parameter settings to the parameter settings required to drive
an induction motor.
NOTE
• Make sure to set Pr.998 before setting other parameters. If the Pr.998 setting is changed after setting other parameters, some
of those parameters are initialized too. (Refer to the "List of the target parameters for the motor parameter initialization".)
• To change back to the parameter settings required to drive an induction motor, perform Parameter clear or All parameter clear.
• If the setting of Pr.998 PM parameter initialization is changed from "8009 or 9009 (rotations per minute)" to "8109 or 9109
(frequency)", all the relevant parameters are initialized.
The purpose of Pr.998 is not to change the display units. Use Pr.53 Frequency / rotation speed unit switchover to change
the display units between rotations per minute and frequency. Using Pr.53 enables switching the unit between rotations per
minute and frequencies without initializing the setting of the motor parameters.
• The PM parameter initialization (Pr.998) changes parameter settings for the first motor. When a PM motor is used as the
second motor, parameters for the second motor must be set individually.
 List of the target parameters for the motor parameter initialization
• The settings of the parameters in the following table are changed to the settings for PM sensorless vector control by
performing the motor parameter initialization using Pr.998 PM parameter initialization. The changed settings differ
according to the specification (capacity) of the PM motor used.
94
4. Control Method
4.3 Selecting the PM sensorless vector control
Initial Setting
value range
Parameter setting (in frequencies) for an
0
induction motor
Parameter setting (in rotations per minute)
8009
for an IPM motor (after tuning)
Parameter setting (in frequencies) for an
0
8109
IPM motor (after tuning)
Parameter setting (in rotations per minute)
9009
for an SPM motor (after tuning)
Parameter setting (in frequencies) for an
9109
SPM motor (after tuning)
page 309.)
Description
The setting of the motor parameters is
changed to the setting required to drive an
induction motor.
The setting of the motor parameters is
changed to the setting required to drive an
IPM motor. (Set Pr.71 Applied motor
and perform offline auto tuning in
advance. (Refer to
The setting of the motor parameters is
changed to the setting required to drive an
SPM motor. (Set Pr.71 Applied motor
and perform offline auto tuning in
advance. (Refer to
page 318.))
page 318.))