Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 398)

6-108 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
The diagnostic trending is a valuable tool for troubleshooting faults
in the drive. It is a method of capturing the variation in the values of
different variables over a period of time prior to and after a fault or
warning condition. In a classic drive, the maximum number of
parameters that can be assigned for trending is 8. The length of the
trend buffer is 100 samples.
Diagnostic Setup
The diagnostic setup is used to define the source of the diagnostic
trigger. Information that has to be programmed in the diagnostic
setup is listed below:
Trace The Read-Only Parameter which is assigned to a
particular list. The item linked to Trace 1 is used as the
trigger value. There are 8 traces in total, although not
all have to be active.
Rate
The time delay between sample periods. Any value
between 0 and 20,000 msec can be set. Use numeric
keypad to enter the value and press the enter key to
accept.
Post
The percentage of the list which will occur after the after
the trigger point. Any value between 0 and 100% may be
used.
Trigger
Defines whether you want a continuous or a single-shot
trigger. Pressing this key will place an S or a C in front
of the trigger parameter. You will almost always want a
Single-Shot (S) trigger.
S = Single shot >> the trigger occurs only once and
stops. The trigger must be manually re-armed. The Re-
Arm function clears the memory buffer, which contains
the data stored from the previous trend. It is necessary to
reset the trending feature in order for a second trigger to
occur, unless you have continuous trigger enabled.
C = Continuous capture >> auto re-arm is enabled to
collect new trends until stopped by viewing contents of
captured data.
Cond Defines the condition that will cause the trigger. The
possible options are:
= Equal to + Boolean OR
N= Not Equal to N+ Boolean NOR
> Greater than & Boolean AND
< Less than N& Boolean NAND
Setting up Diagnostic
Trending