parameter settings for powerflex drives using sine wave ... · application technique...

Application Technique

Parameter Settings for PowerFlex Drives Using Sine Wave Filters, dv/dt Filters, and Adjustable VoltagePowerFlex 700, 700VC, and 750-Series AC Drives

About This Document This information applies to PowerFlex 700, PowerFlex 700VC, and PowerFlex 750-Series AC Drives.

This document provides information for key parameters that can be adjusted when applying the Adjustable Voltage or V/Hz control methods through a Sine wave filter at the output of a Variable Frequency Drive (VFD).

Setting up the drive parameters described in this document modifies the Stability gains, modulation mode, and prevents over reaction to the charging current into the capacitor branch of a Sine wave filter.

Topic PageAbout This Document 1PowerFlex 700 Parameter Settings for Use With Sine Wave Filters 2PowerFlex 700 Parameter Settings for Use With dv/dt Filters 3PowerFlex 700VC Parameter Settings for Use With Adjustable Voltage Application With a Sine Wave Filter

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PowerFlex 753/755 Parameter Settings for Use With Sine Wave Filters 8PowerFlex 753/755 Parameter Settings for Use With dv/dt Filters 9PowerFlex 753/755 Parameter Settings for Use With Adjustable Voltage Application

10

PFLEX-AT002A-EN-P

PowerFlex 700 Parameter Settings for Use With Sine Wave Filters

Below is list of operational theory that describes why the parameter settings are used.

• Motor control setting (P053) needs to be V/Hz because, with the filter between the drive and motor, the load no longer looks like a motor to the drive. Therefore, the drive needs to operate in a simple V/Hz mode.

• Reflected wave (P056, Bit 0) is turned off so that there will be no missing pulses in the output voltage waveform, and to minimize any offsets that could appear.

• Transistor diagnostics (P056, Bit 3) is turned off because the sequence of turning transistors on and off charges the capacitors in the filter and can cause an instantaneous over-current (IOC) trip.

• Pulse width modulation (PWM) frequency lock (P056, Bit 7) is on because the filter is tuned to the carrier frequency, and if the carrier frequency were to change, the filter would not work, so the carrier must be fixed. Also, the PWM frequency needs to be set for whatever the filter is tuned to: either 2 or 4 kHz.

• Drive OL mode (P150) is set for reduce current limit, and not the PWM frequency, for the same reason as pulse width modulation frequency lock.

• Angle stability gain (P506) is set for 0 so it does not try to compensate for the currents it sees going into the filter's capacitors.

• Voltage stability gain (P507) is set for 10 for the same reason as angle stability gain.

• Modulation mode (P524) is set for space vector only since 2-phase modulation would degrade the filter's performance.

Parameter Name Default Setting Set ToP053 Motor Cntl Set 0 (Sensrls Vect) 2 (Custom V/Hz)P056 Compensation

Bit 0 - Reflect Wave 1 (enabled) 0 (disabled)Bit 3 - Xsistor Diag 1 (enabled) 0 (disabled)Bit 7 - PWM Freq Lock 0 (disabled) 1 (enabled)

P057 Flux Up Mode 0 (manual) 0 (manual)P058 Flux Up Time 0.000 sec 0.000 secP150 Drive OL Mode 3 (both-PWM 1st) 1 (reduce CLim)P151 PWM Frequency 2 or 4 kHz see filter instructionsP506 Angl Stability Gain 51 0P507 Volt Stability Gain 93 10P524 Modulation Mode 0 (2-phase + SpV) 1 (Space Vector only)

P069 Start/Acc Boost xx not too highP070 Run Boost xx per motorP071 Break Voltage xx per needP072 Break Frequency xx per need

IMPORTANT Do not autotune.

2 Rockwell Automation Publication PFLEX-AT002A-EN-P - May 2011

PowerFlex 700 Parameter Settings for Use With dv/dt Filters


• Motor control setting (P053) can be V/Hz, Sensorless Vector Control (SVC), or Flux Vector Control (FVC).








Parameter Name Default Setting Set ToP053 Motor Cntl Set 0 (Sensrls Vect) V/hz, SVC, or FVCP056 Compensation

Bit 0 - Reflect Wave 1 (enabled) 0 (disabled)Bit 3 - Xsistor Diag 1 (enabled) 0 (disabled)Bit 7 - PWM Freq Lock 0 (disabled) 1 (enabled)

P057 Flux Up Mode 0 (manual) 0 (manual)P058 Flux Up Time 0.000 sec 0.000 secP150 Drive OL Mode 3 (both-PWM 1st) 1 (reduce CLim)P151 PWM Frequency 2 or 4 kHz see filter instructionsP506 Angl Stability Gain 51 0P507 Volt Stability Gain 93 10P524 Modulation Mode 0 (2-phase + SpV) 0 or 1

P069 Start/Acc Boost xx not too highP070 Run Boost xx per motorP071 Break Voltage xx per needP072 Break Frequency xx per need


Rockwell Automation Publication PFLEX-AT002A-EN-P - May 2011 3

PowerFlex 700VC Parameter Settings for Use With Adjustable Voltage Application With a Sine Wave Filter

Note: Many, but not all, adjustable voltage applications require a Sine wave filter.


• Motor control setting (P053) needs to be set in a form of V/Hz because, with the Sine wave filter between the drive and motor, the load no longer looks like a motor to the drive.– The Adjustable Voltage feature set is used in nontraditional/non-motor

applications that require independent voltage regulator and frequency regulator power control to the load. The drive output is still a form of V/Hz.




Parameter Name Default Setting Set ToP196 [Param Access Lvl] 0 (Basic) 2 (Reserved)P053 (1)

(1) Set these parameters (69, 70, 71, and 72) when using mode 5 (Adj Voltage) for P053.

Motor Cntl Sel 0 (Sensorless Vector) 5 (Adj Voltage)P056 Compensation xx011011 xx010010

Bit 0 - Reflect Wave 1 (enabled) 0 (disabled)Bit 3 - Xsistor Diag 1 (enabled) 0 (disabled)Bit 7 - PWM Freq Lock (2)

(2) In drives with 3.001 firmware and newer.

0 (disabled) 1 (enabled)P057 Flux Up Mode 0 (manual) 0 (manual)P058 Flux Up Time 0.000 sec 0.000 sec

P069 (1) Start/Acc Boost Based on drive rating 0P070 (1) Run Boost Based on drive rating 0P071 (1) Break Voltage Motor NP Volts x 0.25 0P072 (1) Break Frequency Motor NP Hertz x 0.25 0

P150 Drive OL Mode 3 (both-PWM 1st) 1 (Reduce Climit)P151 PWM Frequency 2 or 4 kHz see filter instructions

(typically 2 or 4 KHz)Hidden ParametersP506 Angle Stability Gain 51 0P507 Volt Stability Gain 93 10P524 Modulation Mode 0 (2-phase + SUV) 1 (Space Vector)P552 Dead Time Comp (3)

(3) May be required to adjust setting if there are DC offset voltages at LOAD transformer input windings.

75% 0%







Note: Dead Time Comp (P552) is best set to 0% when output of the Sine wave filter is fed into a transformer, to prevent or minimize DC Offset voltages.

Note: P506, 507, 524, and 552 are only active in Sensorless Vector and Custom V/Hz modes of operation, and therefore require modification when in Sensorless Vector control mode.

In order for the drive’s current regulator to tolerate the charging currents of the Sine wave filter branch circuit, you must modify some hidden parameters affecting the vector algorithm and sensitivity of the current regulator. See Hidden Parameters Overview on page 5 for more information.

Hidden Parameters Overview

Some of the parameters necessary to configure the drive for use with a Sine wave filter are hidden from view via the drive’s Human Interface Module (HIM). These parameters rarely need to be changed, and for most drive operations, Rockwell Automation recommends that these parameters are not changed.

But for rare cases, such as for use with a Sine wave filter, it is necessary to access and configure the hidden parameters via software tools such as DriveExecutive (see Figure 1 and Figure 2 on page 6), or DriveExplorer, communicating through the drive’s Device Peripheral Interface (DPI) ports or Ethernet.

The hidden parameters are part of the 500 group of parameters under the first menu folder. See Hidden Parameters for Use With Sine Wave Filter on page 7) for the specific parameters that can be changed.

1. Access the hidden parameters via the drive HIM, and set parameter 196 [Param Access Lvl] to “2 - Reserved” (see Figure 1 on page 6).

2. Configure the hidden parameters to optimize operation of the drive with the Sine wave filter (see Hidden Parameters for Use With Sine Wave Filter on page 7).

IMPORTANT Change only the hidden parameters for Sine wave filters shown on page 4 and page 7. All other hidden parameters must not be altered.


Figure 1 - DriveExecutive Parameter List, Parameter Access Level

Figure 2 - DriveExecutive Linear List


Hidden Parameters for Use With Sine Wave Filter

ATTENTION: To guard against unstable or unpredictable operation, the following parameters must only be changed by qualified service personnel.

File

Gro

up

No.

Parameter Name & Description Values PF 7

0

PF 7

00

PF70

0H

UTIL

ITY

Diag

-Mot

or C

ntl

508 [Stability Filter]

The Stability Filter coefficient is used to adjust the bandwidth of a low pass filter. The smaller the value of this coefficient, the lower the bandwidth of the filter.

Default:

Min/Max:Units:

3250

0/327671

✔ ✔

509 [Lo Freq Reg KpId]

This proportional gain adjusts the output voltage at very low frequency in response to the reactive, or d-axis, motor current. A larger value increases the output voltage change.

Default:

Min/Max:Units:

64

0/327671

✔ ✔

510 [Lo Freq Reg KpIq]

The proportional gain adjusts the output voltage at very low frequency in response to the active, or q-axis, motor current. A larger value increases the output voltage change.

Default:

Min/Max:Units:

64

0/327671

✔ ✔

511 [Ki Cur Reg]

This integral gain adjusts the output voltage in response to the q and d axis motor currents. A larger value increases the output voltage change.

Default:

Min/Max:Units:

44

0/327671

✔ ✔

512 [Kp Cur Reg]

This proportional gain adjusts the output voltage in response to the q and d axis motor currents. A larger value increases the output voltage change.

Default:

Min/Max:Units:

1600

0/327671

✔ ✔

Diag

-DAC

s

523 [Bus Utilization]

This value sets the drive output voltage limit as a percentage of the fundamental output voltage when operating in 6 step mode. Values above 95% increase harmonic content and jeopardize control stability. This output voltage limit is strictly a function of input line and resulting bus voltage.

Default:

Min/Max:Units:

95.0%

85.0/100.0%0.1%

✔ ✔

524 [PWM Type Sel]

Allows selection of the active PWM type. A value of 0 is default, and results in a change of PWM method at approximately 2/3 of rated motor frequency. If this is unacceptable for harmonic or audible reasons, a value of 1 disables the change.

Default:

Min/Max:Units:

0

0/11

✔ ✔

Diag

-Vec

tor C

ntl

525 [Torq Adapt Speed]

Selects the operating frequency/speed at which the adaptive torque control regulators become active as a percent of motor nameplate frequency.

Default:

Min/Max:Units:

10.0%

0.0/100.0%0.1%

✔ ✔

549 Flux Braking % (% of normal output voltage)

Gain adjustment for Flux Braking mode.

Default:

Min/Max:Units:

175

100/250%

✔ ✔

550 Ki Flying Start

Integral gaing for Flying Start mode.

Default:

Min/Max:Units:

150

20/5000

✔

551 Ki DC Brake

Integral gain for DC Braking mode.

Default:

Min/Max:Units:

25

0/500

✔

552 Dead Time Comp

Voltage compensation for off time between PWM switching events.

Default:

Min/Max:Units:

75

50/100%

✔


PowerFlex 753/755 Parameter Settings for Use With Sine Wave Filters


• Motor control mode (P035) needs to be V/Hz because, with the filter between the drive and motor, the load no longer looks like a motor to the drive. Therefore, the drive needs to operate in a simple V/Hz mode.


• AsyncPwmLock (P040, Bit 8) is on because the filter is tuned to the carrier frequency, and if the carrier frequency were to change, the filter would not work, so the carrier must be fixed. Also, the pulse width modulation (PWM) frequency needs to be set for whatever the filter is tuned to: either 2 or 4 kHz.

• Elec Stab (P040, Bit 11): This bit affects Angle stability and Voltage stability.– Angle stability gain and Voltage stability gain are set for 0 so they do

not try to compensate for the currents they see going into the filter's capacitors.


• Drive OL mode (P420) is set for reduce current limit, and not the PWM frequency, for the same reason as AsyncPwmLock.

Note: Modulation mode is left at default “space vector,” since 2-phase modulation would degrade the filter's performance (P040, Bit 7).

Parameter Name Default Setting Set ToP035 Motor Cntl Mode 0 (Sensrls Vect) 2 (Custom V/Hz)P038 PWM Frequency 2 or 4 kHz see filter instructions

P040 Mtr Options CfgBit 5 - Reflect Wave 1 (enabled) 0 (disabled)Bit 8 - AsyncPwmLock 0 (disabled) 1 (enabled)Bit 9 - PWM Freq Lock 0 (disabled) 1 (enabled)Bit 11 - Elec Stab

(Angl Stability Gain Off) (Volt Stability Gain Off)

1 (enabled) 0 (disabled)

Bit 12 - Xsistor Diag 1 (enabled) 0 (disabled)

P043 Flux Up Mode 1 (automatic) 0 (manual)P044 Flux Up Time frame-dependent 0.000 sec

P420 Drive OL Mode 3 (both-PWM 1st) 1 (reduce CLim)



PowerFlex 753/755 Parameter Settings for Use With dv/dt Filters


• Motor control mode (P035) can be V/Hz, Sensorless Vector Control (SVC), or Flux Vector Control (FVC).


• AsyncPwmLock (P040, Bit 8) is on because the filter is tuned to the carrier frequency, and if the carrier frequency were to change, the filter would not work, so the carrier must be fixed. Also, the pulse width modulation (PWM) frequency needs to be set for whatever the filter is tuned to: either 2 or 4 kHz.

• Elec Stab(P040, Bit 11): This bit affects Angle stability and Voltage stability.– Angle stability gain and Voltage stability gain are set for 0 so they do





Parameter Name Default Setting Set ToP035 Motor Cntl Mode 0 (Sensrls Vect) V/hz, SVC, or FVCP038 PWM Frequency 2 or 4 kHz see filter instructions









PowerFlex 753/755 Parameter Settings for Use With Adjustable Voltage Application


• The motor control mode (P035) Adjustable Voltage mode is typically a non-motor load control function providing an independent output voltage with an independent output frequency.

• Break voltage (P062), break frequency (P063), start boost (P060), and run boost (P061) can cause DC offsets in Adjustable Voltage mode.


• AsyncPwmLock (P040, Bit 8) is on because the filter is tuned to the carrier frequency, and if the carrier frequency were to change, the filter would not work, so the carrier must be fixed. Also, the pulse width modulation (PWM) frequency needs to be set for whatever the filter is tuned to: either 2 or 4k Hz.

Parameter Name Default Setting Set ToP035 Motor Cntl Mode 0 (Sensrls Vect) 9 (Adj Voltage)P038 PWM Frequency 2 or 4 kHz see filter instructions






P060 Start/Acc Boost frame-dependent 0P061 Run Boost frame-dependent 0P062 Break Voltage frame-dependent 0P063 Break Frequency frame-dependent 0


Basic Adjustable Voltage Control ParametersP1131 Adj Vltg Config 1 1 = 3-Phase

0 = 1-PhaseP1133 Adj Vltg Select Disabled Preset 1P1134 Adj Vltg Ref High 0% 100%P1140 Adj Vltg AccTime 0 Secs Required SecsP1141 Adj Vltg DecTime 0 Secs Required SecsP1142 Adj Vltg Preset1 0 VAC Required VACP1153 Dead Time Comp 100% Vary from 100% to 0%



• Elec Stab (P040, Bit 11): This bit affects Angle stability and Voltage stability.– Angle stability gain and Voltage stability gain are set for 0 so they do




Note: Dead Time Comp (P1153) is best set to 0% when output of the Sine wave filter is fed into a transformer, to prevent or minimize DC Offset voltages.



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Publication PFLEX-AT002A-EN-P – May 2011Copyright © 2011 Rockwell Automation, Inc. All rights reserved. Printed in USA.

U.S. Allen-Bradley Drives Technical Support - Tel: (1) 262.512.8176, Fax: (1) 262.512.2222, E-mail: [email protected], Online: www.ab.com/support/abdrives

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