Fieldbus Universal Serial Communication Option Module

Feature First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Feature First Identified as of PowerFlex 755TS Firmware Revision 13.002

The new PowerFlex® Fieldbus Universal Serial Communication (USC) option module, catalog number 20-750-USC-XT, supports these communication protocols:

• DeviceNet
• CANopen
• BACnet
• DF1 RS-485
• Modbus RTU

Note that the USC option module is compatible with firmware revision 13.002. However, the USC option module is not yet available but is expected to be released later in 2024. Please check with your local Rockwell Automation representative to confirm availability.

Integrated Motion on EtherNet/IP Networks for PowerFlex 750-Series Drives with TotalFORCE Control

Feature First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Feature First Identified as of PowerFlex 755TS Firmware Revision 13.002

This feature allows PowerFlex® 750-Series Products with TotalFORCE® Control to operate in Integrated Motion on EtherNet/IP™ (CIP) motion mode. Studio 5000 Logix Designer® version 36.00.00 and later is required.

Key features supported in Integrated Motion on EtherNet/IP (CIP) motion mode:

• Induction motors only
• TotalFORCE Technology including Predictive Maintenance, Adaptive Tuning, Load Observer, and Bus Observer (PowerFlex 755TL/TR/TM only)

Synchronous Reluctance Flux Vector Motor Control for PowerFlex 750-Series Products with TotalFORCE Control

Feature First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Feature First Identified as of PowerFlex 755TS Firmware Revision 13.002

This feature allows PowerFlex® 750-Series products with TotalFORCE® Control to operate in Synchronous Reluctance Flux Vector mode.

Benefits of this motor control mode include:

• Provides more precise speed and torque control with dynamic response
• Improved energy efficiency and motor reliability

Additional Voltage and Current Ratings PowerFlex 755T and 755TS v13.002

Feature First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Feature First Identified as of PowerFlex 755TS Firmware Revision 13.002

This revision of firmware now supports the following new PowerFlex® drive frame sizes, voltage classes, and current ratings:

• PowerFlex 755TL and 755TR, Frame 6 wall-mounted drive that operates at 400V AC, 302 A, 160 kW and 480V AC, 302 A, 250 Hp.
• PowerFlex 755TR Frame 6L liquid cooled drive, 400V AC, 360 A, 200 kW, and 480V AC, 360 A, 300 Hp. This drive is a direct replacement for the PowerFlex 700L Frame 2A liquid cooled drive.

See the PowerFlex 750-Series Products with TotalFORCE® Control Technical Data, publication 750-TD100 for details.

• PowerFlex 755TS, Frame 7A, wall-mounted drive that operates up to 400V AC, 650 A (ND), 355 Hp and 480V AC, 617 A (ND), 500 Hp
• PowerFlex 755TS, Frame 7A, wall-mounted drive that operates up to 400V AC, 567 A (ND), 315 kW and 480V AC, 545 A (ND), 450 Hp

See the PowerFlex 755TS Products with TotalFORCE Control Technical Data, publication 750-TD104 for details.

Reverse End Limit Can Fail to Produce an Alarm

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware revision, when a digital input is assigned in parameter 0:182 [DI RevEndLimit], and the end limit is reached, the product produces an alarm.

Sweep Flying Start Causes Motor to Rotate in Both Directions When Starting from Rest

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware revision, even with parameter 10/11:930 [Direction Mode] set to ‘Rev Disable’ (2), when parameter 10/11:70 [Flying Start] set to ‘Sweep’ (2) the drive does not apply enough torque in the negative direction to turn an induction motor backward.

Drive Remains in Torque Prove End Limit State After Brake Slip and Power Cycle

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware version, the Torque Prove End Limit and Decel Limit state are no longer saved through a brake slip and after a drive power cycle.

Inconsistent Profiling Indexer Reference Move Type

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware version, when drive parameter 10/11:30 [PsnVelTrq Mode A], 10/11:31 [PsnVelTrq Mode B], 10/11:32 [PsnVelTrq Mode C], or 10/11:33 [PsnVelTrq Mode D] is set to 11 ‘Profiler’ and using a Ref Move Type Poly5 & Sine Squared, the velocity profile is now consistent.

PowerFlex 755TS Frame 7 Faults When Using 20-750-TAPS-XT Option Module

Corrected Anomaly with PowerFlex 755TS Firmware Revision 13.002

A power board fault (12127 “Pwr Bd Fault”) occurs when a PowerFlex® 755TS Frame 7 drive is energized with 24V DC power from the TotalFORCE® Auxiliary Power Supply option module (20-750-TAPS-XT) only. This fault also occurs when three-phase power is removed from the drive, leaving only the 24V DC power provided by the auxiliary power supply option module. This fault can be cleared when three-phase power is re-applied to the drive.

The Maximum Value Allowed for Dynamic Brake Ohms Parameter is Too Low

Corrected Anomaly with PowerFlex 755TS Firmware Revision 13.002

The maximum value for parameter 10:131 [DB Ext Ohms] is 100.00 when it should be 10,000.00. This applies to PowerFlex® 755T drives in Induction Flux Vector motor control mode only.

TLink Option Module will not Accept Negative Velocity Reference with Bipolar Configuration

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware revision, when using the TLink option module (cat. no. 20-750-TLINK-XT, 20-750-TLINK-FOC-5, or 20-750-TLINK-FOC-nn) the follower motor can run in a negative direction when given a negative velocity reference from the leader motor. Previously, the follower motor would continue running in the positive direction when given a negative velocity reference.

While Holding Position and Adjusting Position Ki Value Motor Ramps to Full Speed

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

If holding a zero position and the position regulator integral gain parameter (10/11:1757 [u PReg Ki]) is set to any non-zero value, the motor ramps to full speed and the drive produces an ‘OverSpeed Limit’ fault (10010 or 11010). This firmware revision corrects this anomaly.

Inadequate Power Loss Indication for Coast State in Motor Side Status 2 Bits

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

The following bits in parameter 10:355 [Motor Side Sts 2] do not correctly indicate a power loss state for all scenarios.

• Bit 15 'Ride Through' only activates for the “continue” state, with no indication for the “coast” state.

• Bit 16 ‘Inertia RT’ only activates for the “decel” state, with no indication for the “coast” state.

It is expected that bit 15 turns on for both “coast” and “continue” states to signal power loss effectively.

Open Loop Feedback Irregularities and Motor Jump on Initial Start

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 12.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 12.001

PowerFlex® 755T drives configured in position direct mode with open loop feedback exhibit erratic behavior on the first start after a power cycle where the motor “jumps.” At the first start after a power cycle, a sudden change in limited torque reference causes the motor to move to a position and then return to the initial start position. This behavior stabilizes on subsequent starts without requiring a power cycle.

Drive Runs at Slip RPM and Current Limit When Running in Flux Vector Motor Control with an Encoder

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When operating in Flux Vector Control (FVC) mode with an encoder, a PowerFlex® 755T drive incorrectly runs at slip RPM and reaches current limit. This anomaly occurs because the encoder signal is not being properly transmitted across the backplane system to the motor control loop.

Moving the encoder card to another slot or replacing the main control board has resolved the issue in reported cases. Drives using series B main control circuit boards do not experience this anomaly.

This anomaly is corrected for single encoder and duel encoder cards when the control pod backplane circuit boards are replaced in affected drives within the manufacturing date range as stated in the Product Identification section of this notification: Product Notice - 2026-01-001 – Allen‑Bradley® PowerFlex® 755TS, 755TL, 755TR, and 755TM Drives and Bus Supplies, When Used with Specific Option Cards, May Exhibit Power Up Anomalies

Additionally, see the Rockwell Automation Knowledgebase article “PowerFlex 755TS running Flux Vector with encoder is pulling high amps and is not turning (Autotune) or turning slowly” (QA76260) for more information.

Option Modules Firmware Updates can Exceed Five Minutes

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

PowerFlex® option modules firmware updates no longer exceed five minutes to complete.

PowerFlex 755TS Product Powerup Boot Time Exceeds 20 Seconds

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

The Powerup Boot Time for a PowerFlex® 755TS product exceeds 20 seconds.

Rotate Tune Can Fail for IPM Flux Vector with Encoder

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

A fault 12136 ‘Mtrside IOC’ can occur and a PowerFlex® 755TS product can fail a Rotate tuning test after a Static tuning test is run when this configuration exists:

• The drive is operating an Interior Permanent Magnet (IPM) motor in Flux Vector mode with an encoder

DC Brake Auto Off Ends Brake Action Early if DC Brake Level is Less Than 0.5

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

When parameter 10/11:152 [DC Brake Level] is set to a value less than 0.5, bit 19 ‘DC Braking,’ in parameter 10/11:354 [Motor Side Sts 1], does not remain set at 1 until the velocity reaches 0 or the amount of time set in parameter 10/11:153 [DC Brake Time] elapses, as it should. A DC brake level of 0.5 or higher functions normally. This anomaly is corrected with this firmware revision.

See KnowledgeBase article “Powerflex 755T: DC Brake Auto Off Ends Early if DC Brake Level < 0.5” (QA77897) for more information.

Disconnecting Encoder Signals Does Not Produce Safety Feedback Fault

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When a safety option module is installed in the drive and an encoder signal (Sine+/- or Cosine+/-) is disconnected, a safety feedback fault (nn:004) is not produced.

Downloading Offline Configuration to Drive Clears the CIP Security Configuration

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.001

Downloading an offline configuration to the drive clears and disables any existing CIP Security™ configuration.

To avoid unintended consequences, verify and, if necessary, reconfigure CIP Security settings after perform an offline download.

Energy Status Bit Turns On Sooner Than Expected

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When entering Energy Pause mode, Bit 16 "Cls Ext Cont" in the Energy Status parameter is being set after 30 seconds instead of 60 seconds.

Excess Noise in “ActualVelocity” Axis Value When Using Dual Feedback

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When you configure a drive CIP Motion axis for “Dual Feedback,” excess noise occurs in the “ActualVelocity” axis value. Excess noise does not occur when you configure the drive axis feedback type for “Motor Feedback.”

Persistent Invalid Excessive Position Error Faults after Feedback Loss Fault

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

After a Feedback Data Loss Fault (encoder cable removed), the drive fails with an Excessive Position Error Fault (10/11:076) each time a Motor Servo On (MSO) instruction is executed. Power cycling the drive resolves this fault.

Position Loop Overshoots When Switching Between Velocity Mode and Point-to-Point Position Mode

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When a PowerFlex® 755TS drive transitions from Velocity mode to Point-to-Point Position mode, the system does not align with the intended final location.

Power Transistor Diagnostics Test Enabled Results in IOC Fault

Corrected Anomaly with PowerFlex 755TL/TR/TM Firmware Revision 14.001

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

When parameter 10/11:420 [Mtr Cfg Options] bit 12 ‘Xsistor Diag’ (power transistor diagnostics test) is set to 1 ‘On,’ Fault 12:136 ‘Mtrside IOC Flt’ occurs. This anomaly has been corrected with firmware revision 14.001.

PowerFlex 755T CIP Motion Axis Does Not Always Recover from Power Cycle

Corrected Anomaly with PowerFlex 755TL/TR/TM Firmware Revision 14.001

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

Occasionally, a PowerFlex® 755T product in CIP Motion mode will not recover when the main 480V AC power is cycled. The drive connects, but the axis is in a “Configuring” state. This anomaly has been corrected with this firmware release.

PowerFlex 755T with Torque Accuracy Module Does Not Meet the Published Specification

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

A PowerFlex® 755T product with a Torque Accuracy Module (TAM) does not satisfy the accuracy specification for speeds less than 180 rpm and loads greater than 25%. This is also the case for speeds less than 900 rpm and 100% load.

PowerFlex 755TS Frame 1 Inverter Overcurrent Fault when Running Dynamic Motor Test in Velocity or Position Loop Modes

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

During commissioning of a PowerFlex® 755TS frame 1 drive, the Hookup Test and Auto Tune seem to finish successfully. However, the Motor Analyzer Dynamic Motor Test fails with an Inverter Overcurrent Fault.

Some Parameters Do Not Default when Switching from CIP Motion Mode to IO Mode

Known Anomaly First Identified with PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified with PowerFlex 755TS Firmware Revision 13.002

When switching from CIP Motion mode to IO mode, not all parameters in the drive will default to an out-of-the-box configuration. Some parameters will retain the value that was configured in CIP Motion mode.

Start At Power Up Faults with Over Frequency if Power Up Delay is Set to Less than 5 Seconds

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When the Start At Power Up function is enabled and the Power Up Delay is set to five seconds or less, an Over Frequency fault (10015/11015) may occur when the drive starts.

The Start at Power Up function is enabled and disabled by parameter 10:50/11:50 [Start At PowerUp]. The Power Up Delay is determined by parameter 10:52/11:52 [PowerUp Delay].

Synchronous Reluctance Flux Vector Motor with Open Loop Faults on 2 ms Task Overrun

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When a PowerFlex® 755T product is run in Synchronous Reluctance Flux Vector motor control mode with open loop feedback, the product faults on “2ms Task Ovr” (fault 10/11:098). The fault doesn’t occur when the drive is run in Synchronous Reluctance Flux Vector motor control mode with closed loop feedback.

Power Loss Ride-Through is Unavailable in CIP Motion Mode

Corrected Anomaly with PowerFlex 755TL/TR/TM Firmware Revision 14.001

The power loss ride-through function is inoperable for PowerFlex® 755T products in CIP™ Motion mode. When attempting to use power loss ride-through in CIP Motion, the product faults and coasts to a stop. When operating in IO Mode, this feature functions correctly.

Alarms Do Not Clear on Drive Power Up When TorqProve is Enabled

Corrected Anomaly with PowerFlex 755TL/TR/TM Firmware Revision 14.001

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

When the TorqProve™ function is enabled and the drive is energized in IO Mode, a ‘Brake Slip’ or ‘Over Frequency’ Fault occurs. Normal behavior requires a power cycle to clear the fault. However, due to this anomaly, the faults do not clear when the drive is energized.

PowerFlex 755T Drives Reset to Factory Default when Firmware Updated to Revision 13.002

Corrected Anomaly with PowerFlex 755TL/TR/TM Firmware Revision 14.001

Corrected Anomaly with PowerFlex 755TS Firmware Revision 14.001

Any PowerFlex® 755T product experiences a reset to factory defaults when updated to firmware revision 13.002. This revision of firmware corrects this anomaly.

Temperature Faults in PowerFlex 755TS Frame 1 Drive During Power up and Power down with Auxiliary Power

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 12.001

When a Frame 1 PowerFlex® 755TS drive powers up or down by using only auxiliary power (via the 20-750-TAPS-XT option card), multiple false temperature-related faults can occur. These include NTC and Over Temperature faults for phases U, V, and W, as well as junction over-temperature faults. During these events, the IGBT and heatsink temperature parameters report values of 150 °C. This behavior is specific to Frame 1; other frame sizes do not exhibit the issue. Although the faults can be cleared, they reoccur with every power cycle.

Fieldbus Universal Serial Communications Option Card Fails to Recover from Reset

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When resetting the port that contains a Fieldbus Universal Serial Communication option card (20-750-USC-XT), the card fails to recover. The name of the card changes from ‘Universal Comm’ to ‘Comm Mode Type ED’. To avoid this issue, perform the reset on port 0 instead.

IP Address Resets to Dynamic Host Configuration Protocol (DHCP) During Switch from IO Mode to CIP Motion Mode

Known Anomaly First Identified with PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified with PowerFlex 755TS Firmware Revision 13.002

When switching a PowerFlex® drive from IO Mode to CIP Motion mode and back to IO Mode, the drive will reset to DHCP instead of retaining the last IP address. No issues are experienced when switching from IO Mode to CIP Motion mode only.

Axis Remains in Configuring State When Product Powers Up on Auxiliary Power Only

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

When a drive or bus supply powers up by using only auxiliary power, the axis state in Logix Designer remains in ‘Configuring’ until three-phase mains power is energized.

Drive Modulates on First Application of STO Bypass After MSO

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 13.002

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 13.002

In CIP Motion mode, the drive can begin modulating on the first application of a Safe Torque Off (STO) bypass following a Motion Servo On (MSO) instruction. Signal text modals indicate that motion is possible when the STO bypass is enabled.

For subsequent STO bypass applications, the MSO instruction must be reissued after the STO bypass is applied.

Incremental Encoder and Dual Incremental Encoder Feedback Option Modules Allowed in Control Pod Slot 7/8

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

No fault occurs when an Integrated Safety Functions option module (cat. no. 20-750-S4) in CIP safety mode is installed and one of these feedback option modules is incorrectly installed in slot 7 or 8 in the control pod:

• Incremental Encoder (cat. no. 20-750-ENC-1)
• Dual Incremental Encoder (cat. no. 20-750-DENC-1)

When a safety option module 20-750-S4 is installed, feedback option cards 20-750-DENC-1 and 20-750-ENC-1 must be installed in Slot 4 or Slot 5 to function properly.

IPM Flux Vector Flying Start with Low Accel Time Causes Fault

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

Fault 10073/11073 'IPMSpdEstEr' (internal permanent magnet speed estimate error) can occur when an interior permanent magnet (IPM) motor under flux vector control attempts a flying start with very low acceleration times.

IPM Open Loop Inertia Tune Results in 10073 ‘IPMSpdEstErr’ Fault

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

During an Inertia Tune of an Interior-Mounted Permanent Magnet (IPM) motor in open loop flux vector control mode, fault 10073 ‘IPMSpdEstErr’ can occur in cases where the motor rated power is less than one half of the drive rated power.

Process PID does not Support Secondary Motor Control

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

The Process PID function does not support motors operating from the Secondary Motor Control port.

Transition Time from Primary to Secondary Motor Control

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

Approximately 1 second can elapse while transitioning from primary to secondary motor control mode.

PowerFlex 755T Products 250µs Task Overrun Fault

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.003

Previously, in PowerFlex® 755TL/TR/TM/TS firmware revision 13.002, the task peak for the 250 µs task was lowered to prevent a PowerFlex 755T product from reporting a 250 µs Task Overrun fault (10096 “250us Task Ovr”). The implementation in firmware revision 13.002 did not resolve the anomaly completely, particularly when using induction motors in Flux Vector (FV) motor control mode. Firmware revision 13.003 resolves this anomaly.

20-750-ENETR Option Module Firmware Update on Option Module Ethernet Network Fails

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 11.001

Attempting to update a Dual-port EtherNet/IP (20-750-ENETR) option module’s firmware by using ControlFLASH™ software and the option module’s communication port fails. To update the option module’s firmware by using ControlFLASH software, you must use the built-in EtherNet/IP™ adapter on the PowerFlex® 755T main control circuit board.

Autotune for IPM Flux Vector Can Produce Incorrect Results

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

The Autotune function for the Interior Permanent Magnet (IPM) motors in the Flux Vector motor control mode can produce incorrect results. Repeating the autotune can result in different Ld (flux axis inductance) and Lq (torque axis inductance) values. To correct this issue, manually enter the Ld and Lq values.

Fault/Alarm Timestamp Appears on HIM without Fault/Alarm Data

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 11.001

When a fault or alarm occurs, the timestamp only appears on the Human Interface Module (HIM), without the fault or alarm data, respectively.

IPM Open Loop Faults Occur During Transitions Between Low and High Speed

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 11.001

Operating an Interior Permanent Magnet (IPM) motor in open loop can cause faults to occur during transitions between low and high speed.

PowerFlex Bus Supplies and Drives can Crash During a Soft Reset

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 10.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 11.001

PowerFlex® 755TM bus supplies and 755TL and 755TR drives can crash during a soft reset. This anomaly is observed in less than one percent of successive soft reset cycles. If a crash occurs after a soft reset, cycle power to the drive or bus supply.

Update to PowerFlex Firmware Revision 11.001 Causes Parameters to Reset to Defaults and Voltage Class Change

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 11.001

An update from PowerFlex firmware revision 10.001 to PowerFlex firmware revision 11.001 causes these issues:

• All parameters are reset to default values, including the IP address parameters, unless the IP address rotary switches on the main control board are used.

• 480V products are changed to 400V.

• 690V products are changed to 600V.

IMPORTANT: To avoid these issues, before completing the firmware update, save the product parameter configuration for all ports (to a HIM set or an offline file). Once the firmware update is complete, download the parameter configuration to the product.

For instructions on using the Human Interface Module (HIM) to save the parameter configuration, see the PowerFlex 20-HIM-A6/-C6S HIM (Human Interface Module) User Manual, 20HIM-UM001.

For instruction for saving an offline file, see the appropriate online help available with the drive configuration software.

PowerFlex 755T Products 250 µs Task Overrun Fault

Corrected Anomaly with PowerFlex 755TL/TR/TM and PowerFlex 755TS Firmware Revision 13.002

With this firmware revision, the task peak loading for the 250 µs task has been lowered by 20%. This implementation will help prevent a drive from reporting a 250 µs Task Overrun fault (10096 “250us Task Ovr”).

Digital Output Momentarily Energizes During Drive Power-up

Known Anomaly First Identified as of PowerFlex 755TL/TR/TM Firmware Revision 14.001

Known Anomaly First Identified as of PowerFlex 755TS Firmware Revision 14.001

A digital output will momentarily energize during power-up if it is configured to follow a bit that is normally on (one) and is set to invert the logic of that bit.

For example, consider the configuration where the first relay output on an IO card in slot 5 is set to follow the Brake Set bit in the Torque Prove Status parameter, and the logic is inverted:

• Parameter 5:10 [RO0 Sel] is mapped to parameter 9:52 [Trq Prove Status] bit 4 'Brake Set', which is normally on (one).

• Bit 0 'Relay Out 0' is set (one) in parameter 5:6 [Dig Out Invert].

• When the drive powers up, it momentarily energizes the relay output.

If the signal from this digital output is used to release a brake in a torque-proving application, such as within a crane or hoist, the brake will momentarily release during the drive's power-up.

To avoid this undesirable behavior in the above torque-proving example, configure the digital output to follow the Brake Release bit instead of the Brake Set bit in the Torque Prove Status parameter without inverting the logic:

• Map parameter 5:10 [RO0 Sel] to parameter 9:52 [Trq Prove Status] bit 8 'BrakeRelease', which is normally off (zero).

• Reset bit 0 'Relay Out 0' in parameter 5:6 [Dig Out Invert] to a value of zero.

Application Notes for PowerFlex® 755TL/TR/TM and PowerFlex 755TS Firmware Revision 11.001 and Later

Before You Begin a Firmware Update

PowerFlex 755TL/TR/TM and PowerFlex 755TS products (PowerFlex 755T products) revision 11.001 and later firmware is provided as a *.dmk file. ControlFLASH™ Plus software is the recommended application for upgrading your firmware when using a *.dmk file. You can use ControlFLASH™ software to upgrade your firmware, with exceptions.

If necessary, download and install the preferred software from the Product Compatibility and Download Center.

Use ControlFLASH Plus to Update PowerFlex 755T Product Firmware

• For instructions on how to install ControlFLASH Plus software, see the ControlFLASH Plus Quick Start Guide, publication CFP-QS001.
• For instructions on how to upgrade your PowerFlex 755T product firmware by using ControlFLASH Plus, see “Use ControlFLASH Plus to update firmware” in the ControlFLASH Plus Quick Start Guide.

Use ControlFLASH to Update PowerFlex 755T Product Firmware

• For instructions on how to install ControlFLASH software, see the ControlFLASH Firmware Upgrade Kit User Manual, publication 1756-UM105.
• For instructions on how to upgrade your PowerFlex 755T product firmware by using ControlFLASH, see Knowledgebase Answer ID BF25100.