Rockwell Automation Publication 520-QS001A-EN-E - March 2014 27
PowerFlex 520-Series Adjustable Frequency AC Drive
A535 [Motor Fdbk Type] 0/5 0 = “None”
1 = “Pulse Train”
2 = “Single Chan”
3 = “Single Check”
4 = “Quadrature”
5 = “Quad Check”
0 = “None”
Selects the encoder type.
ATTENTION: The loss of analog input, encoder or other feedback may cause unintended speed or motion.
Take appropriate precautions to guard against possible unintended speed or motion.
A536 [Encoder PPR] 1/20000 PPR 1 PPR 1024 PPR
Specifies the encoder Pulses Per Revolution (PPR) when an encoder is used.
A537 [Pulse In Scale] 0/20000 1 64
Sets the scale factor/gain for the Pulse Input when t065 or t067 [DigIn TermBlk xx] is set to 52 “Pulse Train”,
or A535 [Motor Fdbk Type] is set to 1 “Pulse Train”.
Input frequency (Hz) / Pulse in Scale = Output frequency (Hz)
A538 [Ki Speed Loop] 0.0/400.0 0.1 2.0
Sets the I-gain used in the PI calculation of the speed loop when feedback is used.
A539 [Kp Speed Loop] 0.0/200.0 0.1 5.0
Sets the P-gain used in the PI calculation of the speed loop when feedback is used.
A540 [Var PWM Disable] 0/1 0 = “Enabled”
1 = “Disabled”
0 = “Enabled”
Enables/disables a feature that varies the carrier frequency for the PWM output waveform defined by A440
[PWM Frequency].
A541 [Auto Rstrt Tries] 0/9 1 0
Sets the maximum number of times the drive attempts to reset a fault and restart.
ATTENTION: Equipment damage and/or personal injury may result if this parameter is used in an
inappropriate application. Do not use this function without considering applicable local, national and
international codes, standards, regulations or industry guidelines.
A542 [Auto Rstrt Delay] 0.0/120.0 s 0.1 s 1.0 s
Sets the time between restart attempts if A541 [Auto Rstrt Tries] is not zero.
A543 [Start At PowerUp] 0/1 0 = “Enabled”
1 = “Disabled”
0 = “Disabled”
Enables/disables drive start on power up without a Start command being cycled. Requires a digital input
configured for Run or Start and a valid start contact.
ATTENTION: Equipment damage and/or personal injury may result if this parameter is used in an
inappropriate application. Do not use this function without considering applicable local, national and
international codes, standards, regulations or industry guidelines.
A544 [Reverse Disable] 0/1 0 = “Rev Enabled”
1 = “Rev Disabled”
0 = “Rev Enabled”
Enables/disables the function that allows the direction of motor rotation to be changed.
A545 [Flying Start En] 0/1 0 = “Enabled”
1 = “Disabled”
0 = “Disabled”
Sets the condition that allows the drive to reconnect to a spinning motor at actual RPM.
A546 [FlyStrt CurLimit] 30/200% 1% 150%
Used to determine when the drive has matched the motor frequency if flying start is enabled.
A547 [Compensation] 0/3 0 = “Disabled”
1 = “Electrical”
2 = “Mechanical”
3 = “Both”
1 = “Electrical”
Enables/disables correction options that may improve problems with motor instability.
A548 [Power Loss Mode] 0/1 0 = “Coast”
1 = “Decel”
0 = “Coast”
Sets the reaction to a loss of input power.
A549 [Half Bus Enable] 0/1 0 = “Disabled”
1 = “Enabled”
0 = “Disabled”
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.
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] 0/1 0 = “Disabled”
1 = “Enabled”
1 = “Enabled”
Enables/disables the bus regulator.
= Stop drive before changing this parameter.
= Parameter is specific to PowerFlex 525 drives only.
No. Parameter Min/Max Display/Options Default
PF 525
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