Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 111)

Chapter 5
Functional Description
5-25
Activating a Trend Buffer:
1. Select the Trend Enable parameter for the trend buffer you are
setting up.
2. Set this parameter “ON” to activate the buffer or “OFF” to
deactivate the buffer.
Setting the Output Data Rate:
1. Select the Trend Output Rate parameter for the trend buffer you are
setting up.
2. Enter the desired sample rate.
NOTE: The Drive will round the desired sample time to the nearest
4ms.
Trending To Aid Troubleshooting To set up a Trend as an aid to troubleshooting, refer to Chapter 4 of the
1395 Troubleshooting manual for more information.
General Logic Description A general block diagram (software overview) of the 1395 logic is shown in
Figure 5.5. Each of the major functions has a circled reference number
assigned to it, which corresponds to the general software functional
description given in this section.
All diagrams used for the logic description in this manual use a function
block representation of the actual software function being performed.
Calibration and adjustment of the 1395 consists of changing the values of
specific parameters.
Velocity Reference Control (Circle 1)
The 1395 is capable of selecting one of 8 possible speed reference values.
The speed reference value which is selected is determined by the currently
active Logic Command Word (Parameter 150, 151, 152). Bits 0, 1 and 2 of
the logic command provide the binary data to select from 0 through 7
(which corresponds to the 8 speed reference options). Velocity Reference
is a two parameter external velocity reference expressed in Drive Units
(4096 = Base Speed). Parameter 154 supplies the whole number part,
while Parameter 153 supplies the fractional part of the external reference.
Also selectable are five different preset speeds, defined in Parameters 633
through 637. In addition, Logic Command, bits 0,1 and 2 can be used to
select the output of a MOP as the speed reference. Selecting the MOP
function output as a reference bypasses the Jog select function. The MOP
output will enter directly into the speed limit block. Parameters 649 and
650, MOP max and MOP Min speeds, are used to limit the maximum and
minimum MOP speeds that can be reached using the MOP INC and MOP
DEC function.
Bits 9 and 10 of logic command select the Jog function as the speed
reference. Two jog speeds are available; Parameter 638 represents Jog l
and Parameter 639 represents Jog 2. These jog speeds can be defined as
either forward or reverse speed references.