A550, Bus reg, Advanced program group (continued) – Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual User Manual
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Rockwell Automation Publication 520-UM001G-EN-E - September 2014
Chapter 3
Programming and Parameters
Advanced Program Group (continued)
A546 [FlyStrt CurLimit]
Used to determine when the drive has matched the motor frequency if flying start is enabled.
Values
Default:
150%
Min/Max:
30/200%
Display:
1%
A547 [Compensation]
Enables/disables correction options that may improve problems with motor instability.
Options
0 “Disabled”
No compensation.
1 “Electrical” (Default)
Some drive/motor combinations have inherent instabilities which are exhibited as non-sinusodial motor currents.
This setting attempts to correct this condition
2 “Mechanical”
Some motor/load combinations have mechanical resonances which can be excited by the drive current regulator.
This setting slows down the current regulator response and attempts to correct this condition.
3 “Both”
A548 [Power Loss Mode]
Sets the reaction to a loss of input power.
Options
0 “Coast” (Default)
Drive faults and motor coasts to a stop.
1 “Decel”
Drive decelerates and attempts to keep the DC bus voltage above the undervoltage level.
A549 [Half Bus Enable]
Enables/disables the power ride through function which allows the drive to maintain power to the motor at 50% drive input voltage during short-term power sag conditions.
Options
0 “Disabled” (Default)
1 “Enabled”
ATTENTION: To guard against drive damage, a minimum line impedance must be provided to limit inrush current when the power line recovers. The input
impedance should be equal or greater than the equivalent of a 5% transformer with a VA rating 6 times the drive's input VA rating if Half Bus is enabled.
A550 [Bus Reg Enable]
Enables/disables the bus regulator.
Options
0 “Disabled”
1 “Enabled” (Default)
A551 [Fault Clear]
Stop drive before changing this parameter.
Resets a fault and clears the fault queue.
Options
0 “Ready/Idle” (Default)
1 “Reset Fault”
Resets the active fault but does not clear any fault buffer.
2 “Clear Buffer”
Resets the active fault and clears all fault buffers to “0”.
A552 [Program Lock]
Protects parameters against change by unauthorized personnel with a 4-digit password.
Values
Default:
0000
Min/Max:
0000/9999
Display:
1111