Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 162)

7-38 OPERATOR INTERFACE TERMINAL PV-550 REV E
1557-UM050F-EN-P – June 2013
From this screen, additional screens are accessible to perform the diagnostic trending functions.
The screen shows the current status of the trend, (Unprogrammed, Running, Triggered). To
define a trend, press the [F8] key to display the setup screen, shown in Figure 65.
From this screen, the tags to be monitored are assigned to a trace. The tag which you assign to
the first trace 'Trace 1' is used as the trigger variable. By default, when assigning a tag to Trace
1, the trigger value (ie. data) will be set to the tag's minimum value and the trigger condition will be
unprogrammed. A tag must be assigned to Trace 1 before the trigger value or condition can be
set. From this screen you may also set the interval between samples (ie. Rate), and the location
of the trigger point within the view buffer. By default, the trigger will occur in the middle of the
buffer, however you may change this by indicating the percentage of samples which will follow (ie.
Post) the trigger point.
Assigning a Trace
To assign a tag to a trace, use the [cursor up] and [cursor down] keys to highlight the desired
trace and press the [enter] key. (If nothing happens then you have not gained the required access
to make changes. Press the [F8] key and refer to the section entitled "Enter/Modify a Password
(Access)" to gain access).
This will begin the selection process of a tag as described in the section entitled "Select a
Parameter/Variable". When you have completed the selection process, the selected tag will be
assigned to the trace, as in Figure 66. To remove a tag from the highlighted trace, press the
[delete] (Backspace) key.
Figure 64 – Diagnostic Trend Main Menu
Figure 65 – Diagnostics Setup Screen Figure 66 – Assigning a Tag to a Trace