Emerson Epsilon EP Drive 400518-01 Manual de instalación descargar pdf (Pagina 37)

Operational Overview

Brake Activate

The Brake.Activate destination function, when active, will engage the brake unless overridden by the Brake Release function.

This function lets you externally engage the brake while allowing the drive to also control the brake during fault and disabled

conditions.

Brake Disengaged

The Brake.Disengaged source function is used to control the motor holding brake. If the Brake function is off, the brake is

mechanically engaged. When the brake is engaged, the diagnostic display on the front of the drive will display a “b”.

The drive outputs are limited to 150 mA capacity, therefore, a suppressed relay is required to control motor coil. Control

Techniques offers a relay, model # BRM-1.

How Data Capture Works

Data Capture is a mechanism to capture data and display that data graphically. The capture mechanism is part of the drive

and captures drive data as fast as 100 usec. Data is captured in a circular 8 K byte buffer. The format is fixed at 4 channels of

32 bit words for a total of 512 time samples. The circular buffer is continuously loaded until the trigger condition (or com-

mand abort) stops loading data. The capture mechanism follows three buffer states - Filling Buffer, Waiting for trigger, and

Triggered.

At the start of the Run command, the buffer starts to fill (filling the whole buffer). The buffer must be completely filled

before the trigger is armed. Once the buffer is filled, the buffer state will display - Waiting for Trigger. When the trigger is

detected, the data capture is stopped (triggered). The sampling rate is based on the trajectory update rate. The sample rate

can be adjusted in multiples of the trajectory update rate. PowerTools displays this in the form of seconds. At the update

sampling, a new set of data is overwritten into the circular buffer and the trigger is checked.

For Data Capture, the update rate for MDS drive modules is 100 usec for switching frequency of 10 kHz and is 200 usec for

5 kHz. The FM-3/4 module passes data to the drive at the user selectable trajectory update rate of 800, 1200 or 1600 usec.

This means if the Data Capture rate is faster then the FM-3/4 module trajectory update rate the user will be sampling data

faster than it is changing.

The trigger detection checks the data level. It does not specially look for an edge. Once the buffer is filled the trigger is

armed and the check for trigger level is started. Since the drive is looking back in the buffer at data captured during the fill,

the trigger condition may already exist. If that is so, the drive immediately transitions to the trigger state. If not, the drive

continues the data capture cycle of sample and trigger check until the trigger is detected at the edge of the data transition.

When the Trigger Falling Edge check box is selected the trigger is detected when the data transitions below the trigger level.

When sampling digital inputs and outputs, the data captured is binary bit mapped. The state of all the digital signals in the

group selected are encoded into one 32 bit word. When this is graphed it is displayed as an analog signal. To trigger on this

bit map data, the trigger mechanism is changed to a mask. The user can select one of the bits to trigger on.

The captured data is uploaded when the UploadPlot button is pressed. Once uploaded, PowerTools plots the data in graph

window. Data is also saved in a data file named, PtProGraphData.csv. This data file can be exported to a spread sheet for

data manipulation and graphing.

Navigating the Graph Window

The Graph window display can be altered, double-click anywhere in the Graph Window except on the graph area itself. The

Customization dialog box opens and contains tabbed graph options. Many of the graphs attributes, such as colors, line for-

mat, etc. can be changed in this box. The graph can also be exported to a file.

Holding the shift key down while moving the mouse allows the user to zoom in on the graph area. Double-click on the graph

area and the Graph Coordinate window opens and gives the x/y coordinate of where the mouse point was when double-

clicked.

The Graph window overlaps the data into a Y axis if the next channel has the same units. If the units change for the next

channel, a new graph on the Y axis is added to the plot. If None is selected for a channel the drive data capture samples zero

for that channel an PowerTools ignores plotting that channel. The Reserved channel selection is for internal use only and

also captures zero. The title of the graph matches the application’s name defined on the Setup view.

Graph settings are downloaded to the drive when the Run button is pressed. Only changed values are sent. The graph set-

tings are the same as any application variable. When a variable is changed in a PowerTools view the Update to RAM button

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