Faults - Allen-Bradley PowerFlex 70 Reference Manual

Faults

Faults are events or conditions occurring within and/or outside of the drive.
Theses events or conditions are (by default) considered to be of such significant
magnitude that drive operation should or must be discontinued. Faults are
annunciated to the user via the HIM, communications and/or contact outputs.
The condition that caused the fault determines the user response.
Once a fault occurs, the fault condition is latched, requiring the user or
application to perform a fault reset action to clear the latched condition. If the
condition that caused fault still exists when the fault is reset, the drive will fault
again and the fault will be latched again.
When a Fault Occurs
1. The drive is set as faulted, causing the drive output to be immediately disabled
and a "coast to stop" sequence to occur
2. The fault code is entered into the first buffer of the fault queue (see "Fault
Queue" below for rules).
3. Additional data on the status of the drive at the time that the fault occurred is
recorded. Note that there is only a single copy of this information which is
always related to the most recent fault queue entry [Fault 1 Code], parameter
243. When another fault occurs, this data is overwritten with the new fault
data. The following data/conditions are captured and latched into
non-volatile drive memory:
– [Status 1 @ Fault] - drive condition at the time of the fault.
– [Status 2 @ Fault] - drive condition at the time of the fault.
– [Alarm 1 @ Fault], - alarm condition at the time of the fault.
– [Alarm 2 @ Fault] - alarm conditions at the time of the fault.
– Fault Motor Amps - motor amps at time of fault.
– [Fault Bus Volts] - unfiltered DC Bus volts at time of fault.
– [Fault Frequency] (Standard Control).
– [Fault Speed] (Vector Control) - drive output frequency (or speed) at time
of fault.
Fault Queue
Faults are also logged into a fault queue such that a history of the most recent
fault events is retained. Each recorded event includes a fault code (with associated
text) and a fault "time of occurrence." The PowerFlex 70 drive has a four event
queue and the PowerFlex 700 has an eight event queue.
A fault queue will record the occurrence of each fault event that occurs while no
other fault is latched. Each fault queue entry will include a fault code and a time
stamp value. A new fault event will not be logged to the fault queue if a previous
fault has already occurred, but has not yet been reset. Only faults that actually trip
the drive will be logged. No fault that occurs while the drive is already faulted will
be logged.
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
Faults
101