Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 163)

OPERATOR INTERFACE TERMINAL PV-550 REV E 7-39
1557-UM050F-EN-P – June 2013
Setting the Trigger
Once you have assigned a tag to Trace 1, you may proceed to set the trigger value. Two items of
information are required, the trigger condition and the trigger value. These are selected for
modification by pressing the [F2] and [F3] keys respectively. (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). When the respective field is in
reverse video, that field may be modified.
The condition is set to either =, >, <, & by pressing the [cursor up] or [cursor down] keys to scroll
through the conditions. Pressing [enter] ends the editing and accepts the shown condition.
The value (data) is set through the use of the numerical keypad. Use the data entry keys [0]-[9] to
enter the new value. The [-] key can be typed at any time to enter a negative value. The [.] key is
used to enter a decimal point for fractional values. The entered new value can be edited by
pressing the [backspace] key. This key will delete the right most character (ie. number, decimal
point or negative sign) shown on the screen. Press the [enter] key to accept the new value as
shown in Figure 67. If the new value you entered is outside the limits defined, the new value will
be pegged at the closest limit. For example: if you entered 900 when the minimum value was
1000, the new value will show 1000.
Some data must be entered in HEX. To accomplish this, use the cursor up/down keys to scroll
through the values 0-F for the right most digit. To accept the digit and enter to the right of the
current digit, press the right cursor key. Press the [Enter] key to accept the value.
The value may be edited the same as a value entered from the numeric keypad.
Defining Sample Rate & Positioning
The rate at which the samples are taken are set by pressing the [F4] key. This data field is then
modified in the same manner as the trigger data is entered. Rates can be set from 0 mSec
(collect as fast as possible) to 20.000 Seconds.
When samples are collected, part of the buffer will store values prior to the trigger point and the
remainder of the buffer will store values after the trigger. Pressing the [F5] key will allow you to
set the percentage of the trend buffer, allocated to values collected, after the trigger has occurred.
This data field is modified in the same manner as the trigger data is entered.
Figure 67 – Editing a Data Field