PowerFlex 755 fault codes
This chapter provides a comprehensive
guide for troubleshooting Allen Bradley PowerFlex 750-Series faults, alarms, and
configurable conditions, ensuring efficient and effective maintenance.
Faults and Alarms:
Faults: Categorized into three types: Auto Reset Run, Resettable, and Non-Resettable.
Alarms: Divided into two types: Type 1 (user-configurable) and Type 2 (non-configurable and prevents drive start).
Configurable Conditions: Can be set by the user as an alarm or fault.
Troubleshooting and Maintenance:
Fault Display: Automatically appears in case of a fault, showing the fault code, description, and elapsed time.
Clearing Faults: After acknowledging and addressing the cause, faults can be cleared via the HIM or by power cycling.
Additional Information:
Fault and Alarm Codes: Displayed in formats varying with the port and event number, ensuring precise identification.
Hardware Service Manual and System Resource Allocation: Provide guidance for maintenance and managing system resources.
Refer to the relevant sections of the user manual for detailed information and procedures.
0- No Entry: The table includes a fault labeled "No Entry", but no further details are provided for this specific fault.
2- Auxiliary Input: This is a resettable fault. When triggered, the drive will coast. The fault indicates that an auxiliary input interlock is open.
3- Power Loss: This fault can be configured using the parameter P449 [Power Loss Actn]. When the DC bus voltage stays below a certain level for longer than the allowed time, this fault is activated.
4- UnderVoltage: Configured using P460 [UnderVltg Action], this fault indicates that the bus voltage has fallen below a specified value, signaling an undervoltage condition.
5- OverVoltage: A resettable fault where the DC bus voltage surpasses its maximum limit, causing the drive to coast.
7- Motor Overload: Configurable with P410 [Motor OL Actn], this fault is triggered when the drive experiences an internal electronic overload.
8- Heatsink OvrTemp: When the heatsink temperature goes beyond the drive's specified temperature, this resettable fault is activated. Specifically, heatsink overheating occurs between 115-120°C. The exact threshold is stored in the drive firmware.
9- Trnsistr OvrTemp: Another resettable fault that occurs when the output transistors surpass their maximum temperature limit.
10- DynBrake OvrTemp: An alarm indicating that the dynamic brake resistor has exceeded its maximum operating temperature.
12- HW OverCurrent: This resettable fault is activated when the drive's output current goes beyond the hardware's current limitation.
13- Ground Fault: Triggered when a current path to the ground surpasses 25% of the drive's rating.
14- Ground Warning: This configurable fault indicates when the ground current exceeds the level set in P467 [Ground Warn Lvl].
15- Load Loss: When the output torque current remains below a certain value for longer than the programmed time, this fault, configurable with P441 [Load Loss Action], is activated.
17- Input Phase Loss: Configured using P462 [InPhase LossActn], this fault is triggered when the DC bus ripple surpasses a preset value.
18- Motor PTC Trip: Configurable with P250 [PTC Config], this fault indicates that the Motor PTC (Positive Temperature Coefficient) has detected an over-temperature condition.
19- Task Overrun: An alarm that signals when the system's resource usage is at or above 90% of its capacity. Users are advised to refer to a resource allocation table for more details.
20- TorqPrv Spd Band: This resettable fault indicates when the difference between set and actual speeds surpasses a predetermined level for an extended time.
21- Output PhaseLoss: Configured using P444 [OutPhaseLossActn], this fault suggests that the current in one or more phases has been lost or remains below a set level.
24- Decel Inhibit: Using P409 [Dec Inhibit Actn], this configurable fault indicates that the drive is not following a commanded deceleration because it's trying to regulate the bus voltage.
25- OverSpeed Limit: A resettable fault triggered when the motor's operating speed exceeds the limits set by the maximum speed setting P524 [Overspeed Limit]. The boundaries for forward and reverse motor rotation are determined by P520 [Max Fwd Speed], P521 [Max Rev Speed], and P524 [Overspeed Limit]. The motor's operating speed is based on P131 [Active Vel Fdbk] for flux vector control modes and P1 [Output Frequency] for other modes.
26- Brake Slipped: This alarm comes in two forms. Alarm 1 is activated when the encoder movement surpasses the level in P1110 [Brk Slip Count] after setting the brake and while the drive is still active. Alarm 2 is triggered under the same conditions but after the brake slip maneuver has concluded and the drive is stopped.
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