Hi everyone,

The above text is describing different types of faults that can occur in a drive system and the actions that can be taken to reset the faults. There are three types of faults:

Auto-Reset: If the fault occurs and [Auto Rstrt Tries] is set to a value greater than 0, a timer begins, and the drive attempts to automatically reset the fault when the timer reaches zero.
Non-Resettable: This type of fault requires repair and can only be cleared after the cause of the fault is corrected and the system is powered up.
User Configurable: These faults can be enabled or disabled by the user, and the decision to annunciate or ignore the fault condition is configurable.

The "Parameter Chksum 100 2" error message indicates that there is a mismatch between the checksum read from the board and the calculated checksum. The recommended actions are:

Restore the default settings
Reload the User Set if it was used.


Fault code 48 "Params Defaulted" indicates that the drive was commanded to write default values to EEPROM. To resolve this issue, you can:

Clear the fault or cycle power to the drive
Program the drive parameters as needed.


Phase U to Grnd 38
Phase V to Grnd 39
Phase W to Grnd 40
A phase to ground fault has been detected between the drive and motor in this phase.

Check the wiring between the drive and motor.
Check motor for grounded phase.
Replace drive.

The Fatal Fault 900...930   diagnostic code indicates a drive malfunction in a system. To troubleshoot, the following steps are recommended: 1) Cycle power, 2) Replace Main Control Board, 3) Contact Technical Support.

The Flt QueueCleared 51 is a marker used in the Fault Queue indicating that the clear queue function was performed and there is currently no fault displayed.

The FluxAmpsRef Rang 78 diagnostic code indicates that the value for flux amps determined by the Autotune procedure is higher than the programmed Motor NP FLA value. To resolve this issue, the following steps are recommended: 1) Reprogram the Motor NP FLA with the correct motor nameplate value and 2) Repeat the Autotune procedure.

The Ground Fault F 13 diagnostic code indicates a current path to earth ground that is greater than 25% of the drive rating. To resolve this issue, the motor and external wiring to the drive output terminals should be checked for a grounded condition.

The Heatsink LowTemp F 10   diagnostic code indicates either a too low temperature case or an open NTC (heatsink temperature sensing device) circuit. To resolve this issue, the following steps are recommended: 1) Verify the ambient temperature, 2) in cold ambient temperatures, add space heaters, and 3) check connections to the NTC.

The Heatsink OvrTemp 8   diagnostic code indicates that the heatsink temperature has exceeded 100% of the Drive Temp. To resolve this issue, the following steps are recommended: 1) Verify that the maximum ambient temperature has not been exceeded, 2) check the fan, and 3) check for excess load.

The HW OverCurrent F 12  diagnostic code indicates that the drive output current has exceeded the hardware current limit. To resolve this issue, the following steps are recommended: 1) Check the output of the drive or motor for shorts, 2) check programming, and 3) check for excess load, improper DC boost setting, DC brake volts set too high, or other causes of excess current.


The Incompact MCB-PB F 106   diagnostic code indicates that the drive rating information stored on the power board is incompatible with the main control board. To resolve this issue, a compatible version of the files should be loaded into the drive.


The Input Phase Loss F 17 diagnostic code indicates that the DC bus ripple has exceeded a preset level. To resolve this issue, the incoming power should be checked for a missing phase or blown fuse.

The IR Volts Range F 77 diagnostic code indicates that the value determined by the autotune procedure for IR Drop Volts is not in the range of acceptable values. To resolve this issue, the motor nameplate data should be re-entered.

The IXo VoltageRange F 87 diagnostic code indicates that the voltage calculated for the motor inductive impedance exceeds 25% of the Motor NP Volts. To resolve this issue, the following steps are recommended: 1) Check for proper motor sizing, 2) check for correct programming of the Motor NP Volts (parameter 41), and 3) additional output impedance may be required.

The Load Loss F 15 diagnostic code indicates that the drive output torque current is below the Load Loss Level for a time period greater than the Load Loss time. To resolve this issue, the following steps are recommended: 1) Verify the connections between the motor and load, and 2) verify the level and time requirements.

The Motor OverLoad F 7 diagnostic code indicates an internal electronic overload trip. The steps to resolve this issue are as follows:

Enable/disable with Fault Config 1 on page 53, and
Reduce the load so the drive output current does not exceed the current set by the Motor NP FLA. If enabled, check the level of flux braking in parameter P549 [Flux Braking %].


The Motor Thermistor F 16 diagnostic code indicates that the thermistor output is out of range. To resolve this issue, the following steps are recommended: 1) Verify that the thermistor is connected, and 2) reduce the load if the motor is overheated.

The Overspeed Limit F 25 diagnostic code indicates that functions such as Slip Compensation or Bus Regulation have attempted to add an output frequency adjustment greater than that programmed in [Overspeed Limit]. To resolve this issue, the following steps are recommended: 1) remove excessive load or overhauling conditions, or 2) increase [Overspeed Limit].

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+ PowerFlex 70 User manuals 

+ PowerFlex 70 Fault Codes 1 >>

+ PowerFlex 70 Fault Codes 2 >>

+ PowerFlex 70 Fault Codes 3 >>

+ Allen Bradley Homepage (second hand)

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