2-78 Parameter Descriptions
7000-TD002A-EN-P – September 2007
Flux Regulator Bandwidth [FlxReg Bandwidth]
Linear Number: 97
Default Value: 10.0 r/s
Minimum Value: 1.0 r/s
Maximum Value: 30.0 r/s
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the small signal bandwidth of the flux control loop. It is used in the calculation of
the flux regulator gain. The maximum bandwidth possible for stable flux control tends to decrease as
motor size increases.
Flux Command Rated Load [FlxCmd RatedLoad]
Linear Number: 100
Default Value: 0.900 pu
Minimum Value: 0.000 pu
Maximum Value: 1.500 pu
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the value of the flux command at rated load. The flux command will never be
greater than this parameter, which can be set manually or by auto-tuning.
Flux Command No Load [FlxCmd No Load]
Linear Number: 103
Default Value: 0.700 pu
Minimum Value: 0.400 pu
Maximum Value: 1.500 pu
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the value of the flux command at no load. The flux command will change
linearly from FlxCmd No Load (103) to FlxCmd Rated Load (100) as Torque Reference (291) changes
from 0.00 to 1.00. Reducing the motor flux improves efficiency when running for extended periods at less
than full load. The maximum torque capability of the drive is reduced in proportion to the reduction in flux.
If the load increases suddenly when the drive is running with reduced flux, there may be a large drop in
speed until the flux can be restored to its normal level. If FlxCmd No Load is set higher than FlxCmd
Rated Load, the flux command will not vary with load.
Motor Flux Time [Motor Flux Time]
Linear Number: 78
Default Value: 3.0 sec
Minimum Value: 0.0 sec
Maximum Value: 10.0 sec
Access Level: Advanced
Read/Write: Read/Write
This parameter specifies the time interval during which the motor is being magnetized. The purpose of
the delay is to allow flux to be established in the motor before attempting to accelerate. If the torque
required at starting is very low, then this parameter can be set to a small value such as 1 second, but
should be set to a higher value if high starting torque is required. This parameter is active even when tach
feedback is enabled.
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