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1.6 Low-speed range torque characteristics (Pr.788)
Åt ÅsIPMÅt
* Current synchronization operation is always performed for IPM motors other than MM-CF, even if "9999" is set.
(1) When the low-speed range torque characteristic is enabled ("9999" (initial value))
· The high frequency superposition control provides enough torque in the low-speed range operation.
· Refer to page 17 for the torque characteristics.
(2) When the low-speed range torque characteristic is disabled ("0")
· The current synchronization operation reduces much motor noise compared with the high frequency superposition
control.
· The torque in a low-speed range is low. Use this setting for an operation with light start-up load.
· Refer to page 17 for the torque characteristics.
1.7 Setting the acceleration/deceleration time in the low-speed range
(Pr.791, Pr.792)
Torque characteristics in a low-speed range can be changed.
Parameter
Number
Name
Initial
Setting
Setting
Range
Operation
788
Low-speed range torque
characteristics
9999
0
Disables the low-speed range torque characteristic
(current synchronization operation).
9999
*
Enables the low-speed range torque characteristic
(high frequency superposition control)
REMARKS
Position control under PM sensorless vector control is not available when the current synchronization operation is selected.
Parameter
Number
Name
Initial
Value
Setting Range Description
791
Acceleration time in
low-speed range
9999
0 to 3600/360s*
Set the acceleration time in a low-speed
range (less than 1/10 of the rated motor
frequency).
9999
The acceleration time set in Pr.7 is applied.
(When the second functions are enabled,
the settings are applied.)
792
Deceleration time in
low-speed range
9999
0 to 3600/360s*
Set the deceleration time in a low-speed
range (less than 1/10 of the rated motor
frequency).
9999
The deceleration time set in Pr.8 is applied.
(When the second functions are enabled,
the settings are applied.)
* Depends on the Pr. 21 Acceleration/deceleration time increments setting. The initial value for the setting range is "0 to 3600s" and the setting
increments is "0.1s".
PMPMPM
PMPMPM
PMPMPM
PMPMPM
PMPMPM
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