114 Rockwell Automation Publication 520-UM001A-EN-E - February 2013
Chapter 3 Programming and Parameters
Advanced Program Group (continued)
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] Related Parameter(s): A553
Protects parameters against change by unauthorized personnel with a 4-digit password.
Values Default: 0000
Min/Max: 0000/9999
Display: 1111
A553 [Program Lock Mod] Related Parameter(s): A552
Determines the lock mode used in parameter A552 [Program Lock]. When set to 2 or 3, A552 [Program Lock] is added to the custom group to allow unlocking of parameters.
Options 0 “Full Lock” (Default) All parameters are locked except [Program Lock].
1 “Keypad Lock” All parameters are locked except [Program Lock] from keypad access but can still be accessed over communications.
2 “Custom Only” All parameters are locked and hidden except custom group and [Program Lock].
3 “KeyPd Custom” All parameters are locked and hidden except custom group and [Program Lock] from keypad access but can still be accessed over
communications.
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