Vibration Research VR8500 Manuale utente

VR8500

Table of Contents

VR8500………………………………………………………….....3

Setting up the Hardware………………………………………….3

Establishing communication with PC…………………………...4

Input Configuration (setting sensitivities for inputs)………….. 6

System Limits (shaker limits and moving mass)………………..7

System Check……………………….……………………………. 7

SineVIEW test set-up……………………………………………. 9

RandomVIEW test set-up……………………………………….12

ShockVIEW test set-up (Classical Shock)……………………...14

FDRVIEW test set-up……………………………………………16

Automatic Report generation…………………………………...18

Tips & Tricks……………………...………………………….......20

VR8500

VR8500:

Thank you for purchasing a VR8500 vibration control system from Vibration Research Corp. We

appreciate your business. Vibration Research Corp. is continually upgrading the features and capabilities

of our products. Please visit our website (www.vibrationresearch.com) regularly to download the latest

available VibrationVIEW software for your VR8500 controller.

Also, in the event your have questions regarding your system you can either contact the V.R.C.

representative from whom your controller was purchased, or contact our product support staff directly at

support@vibrationresearch.com or call 616-669-3028 from 8-5 Eastern, Monday-Friday.

SETTING UP THE HARDWARE:

Connecting the VibrationVIEW I/O hardware:

1. Set up the computer in the conventional configuration, with power cables, mouse, keyboard, and

monitor.

2. Connect the VR8500 network port to the dedicated network card in the computer using the included

yellow crossover cable. If your VR8500 is labeled "Adapter Cable Required", the included red

adapter cable and metallic CAT5 in-line coupler MUST be connected between the yellow crossover

cable and the network port of the VR8500.

3. Connect the line cord to the VR8500. The power input will automatically switch for voltage 90-

250VAC and 50/60 Hertz.

4. Connect the shaker amplifier's input to the Drive output connector on the rear of the VR8500.

5. Connect an accelerometer to Channel 1 of the VR8500. Other accelerometers can be connected to

Channels 2,3 and 4.

VR8500

Connecting two or more VR8500 units

1. Two or more VR8500 units require a network switch.

2. Connect the first VR8500 to port 1 on the switch. Additional VR8500's can be connected to port 2,3,

and 4 on the switch. Connect the computer to highest numbered

port with the supplied cable.

3. Connect 120 VAC power cords to each of the VR8500's.

4. Connect the shaker amplifier's input to the Drive output connector

on the first VR8500. For systems controlling two shakers simultaneously, connect the second

shaker’s amplifier input to the Drive output connector on the second VR8500.

5. Connect accelerometer channels 1-4 to channels 1-4 of the first VR8500, accelerometer channels 5-8

to channels 5-8 on the second VR8500, accelerometer channels 9-12 to channels 9-12 on the third

VR8500 accelerometer and channels 13-16 to channels 13-16 on the fourth VR8500, etc. up to 32

channels.

ESTABLISHING COMMUNICATION WITH PC:

Configuring the VR8500

1. Set up the dedicated network card for

VibrationVIEW. Select the network card

dedicated to the VR8500 from the

Network Connections applet in Control

Panel ("Start --> Settings --> Control

Panel --> Network Connections" in Win

XP). Your network connection will

display the name assigned when the

network card was installed, typically

"Local Area Connection 2". Double click

on the "Local Area Connection 2" and

click on the "Properties" button.

Remove the check marks from "Client for

Microsoft Networks", and "File and

Printer Sharing for Microsoft Networks."

Select Internet Protocol (TCP/IP) and

click the "Properties" button to continue.

VR8500

3. Assign address 192.168.3.10 and subnet mask 255.255.255.0 as shown in the Internet Protocol (TCP/

IP) Properties dialog box. If multiple network cards are installed in the computer the IP address can

be adjusted. Other recommended values are 192.168.2.10 and 192.168.4.10, although any Class C or

Class D subnet will work. Click the OK button to return to the previous dialog

4. Click the Advanced tab in the Properties dialog box. Make sure Internet Connection Sharing for this

connection is unchecked (NOT enabled).

5. VibrationVIEW must be configured to use the appropriate network connection after the network is

setup. Start VibrationVIEW by double-clicking the VibrationVIEW icon on the desktop. Select the

Configuration..Hardware menu command.

VR8500

6. Select the network card previously

configured. Typically this will be

192.168.3.10. Click the apply button.

7. Your VR8500 serial number will be added to

the drop down menu for Channels 1-4 when

it initially connects to the computer. Select

the appropriate VR8500 serial number to

configure channels 1-4 and, optionally,

channels 5-8, channels 9-12, and 13 through

32 (in blocks of 4 channels). The VR8500

control boxes are assigned addresses from the

range listed in the Control Boxes Address

parameters. This does not need to be

changed.

INPUT CONFIGURATION (setting sensitivities for inputs):

The inputs must be configured for each connected

accelerometer. Each input can be configured as

single ended, differential and optionally capacitor

coupled. Single ended inputs can also provide a

constant current source to power your

accelerometers. Other types of accelerometers

such as charge coupled accelerometers require

external conditioning. Be sure to enter the proper

calibration factor (in mV/g) for each channel.

If the connected accelerometer has TEDS

(Transducer Electronic Data Sheet) containing the

calibration information, simply click the “Read

TEDS” button and the information will

automatically be entered.

When the appropriate values are entered, click the

"OK" button. The new accelerometer sensitivity

factors will take effect immediately.

Note: Be sure to check the “Accel power source” box if you want the VR8500 to provide the constant

current source to your accel.

VR8500

SYSTEM LIMITS (shaker limits and moving mass):

The controller checks the system specifications to

determine if the shaker is able to perform the current test.

The shaker force, velocity and displacement limit values

only need to be entered once when the system is first

configured. The fixture and product masses that are

required to properly compute the acceleration limits of the

shaker must be entered every time the fixture or product

mass is changed.

To set the system limits, select the Configuration..System

Limits menu command. In the dialog box, select either the

system matching your setup or enter the specifications of

your system. These specifications should be listed in the

manual for your shaker system.

To enter the system mass, select the Configuration..System

Mass menu command. Enter the masses for all the shaker

parts on your system. If your system does not have one of

the listed parts, enter zero for that item's mass. The sum of

these mass values is used to calculate the maximum

operating acceleration for your system using Newton's law:

Force = mass * acceleration

SYSTEM CHECK:

To verify that the input and output levels and frequencies are correct, perform the following procedure:

1. Select the Test..System Check menu command to switch the system into

System Check mode.

2. Select the Configuration..Inputs menu command. Verify that your

accelerometer sensitivity and power source settings are configured

appropriately. The constant current source is enabled in this dialog box.

If you are using constant current accelerometers or a conditioner that

requires a constant current source make sure the "Accel power source" is

checked. Click the "OK" button.

3. For Electro Dynamic shakers, enter a frequency of 30 Hz and a

displacement of 0.1 inches (peak-to-peak) in the System Check Control

Center. These are the default values. For Servo Hydraulic shakers, set

to 20 Hz and 0.05 inches (peak-to-peak).

4. Verify that the input levels are near zero (double right-click on the graph

to autoscale).

VR8500

5. Click the "Auto" button. The output level should slowly ramp up until the shaker approaches a 0.1-

inch peak-to-peak displacement (0.05 inches if using the Servo Hydraulic recommended set-up).

6. If the shaker does not move, click the "Stop" button to turn the output off. Verify that the Drive

output connector from the VR8500 is

connected to the shaker amplifier's input,

that the amplifier is turned on and that

the amplifier output is connected to the

shaker. Return to step 4.

7. If the shaker still does not move, connect

the Drive output connector of the

VR8500 to an oscilloscope or true RMS

voltmeter, set the output voltage level to

0.5 volts (0-to-peak) and verify that you

have a 0.5 volt (0-to-peak) amplitude

reading (0.35 volts RMS). If the Drive

output connector is not measuring 0.35

volts RMS, your system may require

calibration.

8. If the shaker vibrates, but the input

waveform remains flat, click the "Auto"

button a second time so that the text on

the "Auto" button is dark and the output stops ramping up. Check the accelerometer cables to verify

that they have good connections and that the accelerometer conditioning equipment is turned on. If

you are using the internal current source to power the accelerometer, verify that "Accel power

source" on Configuration..Inputs dialog box is checked. If there still is no input signal, connect the

conditioned accelerometer signal to an oscilloscope or voltmeter and verify that you see a voltage

reading. If there is no reading, click the "Stop" button to turn the output off, replace the

accelerometer cable, accelerometer and/or the accelerometer conditioning equipment with devices

known to be working and return to step 4. Note:

most problems are due to bad cable connections.

9. Once you get both an output and an input signal,

use a displacement measurement tool to verify that

the shaker peak-to-peak displacement matches the

value shown in the System Check Control Center.

If it does not match, select the

Configuration..Inputs menu command to verify

that the accelerometer sensitivity settings match

the calibrated values for the accelerometers you

are using.

Note: To use the V Scope Displacement Measurement Tool – tape or hold firmly on shaker head so

that it moves in the direction of vibration (see arrows). The lines will blur and intersect at the

0.1 inch mark on the measurement tool if the shaker is moving as directed above (0.05 for the

servo hydraulic set-up). If the lines don’t intersect there, check that your accelerometer

sensitivities are set correctly (and power source on, if required).

VR8500

SineVIEW TEST SET-UP:

Click the New Test button and

select “Sine” to begin defining a

new Sine test. This will guide you

through the following series of

configuration dialog boxes. Default values will be supplied for all parameters. If you are unsure about a

parameter, use the default value (click the “Help” button in the lower right corner of the Settings window

for specific Help information). After all the values for each dialog tab are entered, click the next tab to

advance to the next set of information for setting up the test.

1. Sine Profile - The amplitude and

frequency breakpoints and the

desired control parameters

(acceleration, velocity or

displacement) for the test are

entered here. Use the scrollbar to

scroll through the defined segments

and the Insert/Delete buttons to add

or remove segments. The small

arrow next to the numbers on the

left of the window indicates the

current insertion/deletion point. A

test may be composed of over 1000

segments.

2. Sine Schedule - The duration of the

test is entered here. Durations may

be entered in time duration, number

of sweeps or number of cycles. The

test schedule is also used to

schedule sweeps scaled to different

amplitude levels and to select one or

more fixed frequency tones.

3. Sine Sweep - Your sweep rate is set

next. Enter the sweep rate and click the drop box to select the desired units.

4. Sine Parameters - The feedback control parameters for the test are entered here. For most tests, the

parameters may be left at their default values. In some cases (such as when the control accelerometer

sees a large resonance) these values will need to be tuned.

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