T14_Troubleshooting the 3500 Monitoring System

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3500 Operation and Maintenance - Section 14: Page 1

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Troubleshooting the

3500 Monitoring System

Topic Objectives:

You will be able to explain the various kinds of problems that can potentially occur

with a 3500 monitoring system installation.


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Page 2: 3500 Operation and Maintenance - Section 14

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Potential Connection Problems

There are several wiring issues that can affect the 3500 monitoring system, including the

following:

open or shorted field wiring from the transducer system to the monitor rack

improper connections at the monitor rack, and/or at the transducer interface

monitoring rack or I/O jumpers incorrectly installed for the given configuration

corrosion on the field wiring connections

grounds loops

When the wiring is complete and uninterrupted, there may still be wiring issues.Grounding of the transducer wiring anywhere but at the rack, or at the selected single

point ground can create voltage potential differences, and noise. In addition, placing thelow voltage transducer signal wiring near high voltage wiring or fields may also

introduce noise, or unexpected effects.


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Configuration of the Monitor

In most cases, the 3500 configuration software will not allow the improper use of a

monitor or I/O module. However, the following conditions can still cause problems:

incorrect or unusable setpoint adjustments

incorrect configuration of the transducer devices

incorrect scales and/or limits for the direct measurement, or for any of the related

variables

As mentioned in an earlier section, the best practice for configuring a set of monitors and

channels is to set the first of each kind of monitoring channel very carefully, and reviewthe configuration. Then, use the Copy process available at three levels (i.e., channel,

channel pair, and monitor) to configure the remainder of that group of monitors. This is amuch easier, and much safer practice.


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Configuration Issues

Some dynamically configured devices, such as the rotary potentiometer Valve Position

transducer or the LVDT Case Expansion measurement, must be partially configuredwhile the software is connected to the monitoring system. This is a significant

convenience, since it allows the ability to calibrate the monitor using the actual

transducer signal. The process is implemented by allowing the lowest and highest

voltage or measurement inputs to be set in the software, and then downloaded to the

monitor. Without the software process, a voltage measurement and manual entry wouldbe required to set the lower and higher limits. However, it is critical that the stepsspecified in the Rack Hardware Installation, Operations, and Maintenance manual are

implemented properly and in the correct order for these devices to be properly

configured.


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Use of I/O Modules

As with monitors, the software will not allow an improper I/O module to be downloadedto the rack. The configuration software displays the proper module when the monitor

data has been uploaded from the rack.

It is recommended to use the 3500 Configuration software and perform an upload fromthe rack before the initial software configuration is done. When uploading the

configuration, this will include all inserted monitors and I/O modules causing lesslikelihood for a mis-match.


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Compatibility Issues

Older monitors and modules may cause problems when applied to newer devices and/or

installations. In most cases, an older monitor can be updated by way of eitherdownloading the firmware through the configuration software, or replacing an EPROM

(erasable read only memory) chip on the board.

The configuration software allows the user to view the firmware revisions in most of the

newer monitors, and as mentioned earlier, it is possible to download the new firmware tosome of the newer monitors via the configuration software.

An older monitor that does not seem to respond to the proper configuration process, or is

not acting properly after a configuration process may need to have a firmware upgrade.

When updating firmware on the 3500/22M Transient Data Interface (TDI), the TDI DSP

update will need to be applied also. Contact your local Bently Nevada representative toassist in this process.


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Disabling (Bypassing) Monitors

Monitors may be bypassed at any time from the configuration or display software by

selecting the appropriate channel or monitor switches and changing their state(s).Bypassed or Not OK channels are not allowed to drive alarms, so this will not change the

state of any relays.

As an added note here, and as mentioned previously in this course, it is actually possible

to change a relay state by placing a monitor into bypass. An example might be if twomonitors are Normally ANDed. If one is already at the appropriate level (i.e., Alert orDanger), and the other is REMOVED from the logical equation, the relay will change

state on the information provided by the monitor already in alarm. In other words, the

relay will change state, potentially (and unexpectedly) taking a machine off line. Once

again, it is always a good idea to identify the voting monitors, and place them into theappropriately bypassed or inhibited state when making configuration changes to any of

the monitors.


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Disabling (Bypassing) Monitors

Monitors and power supplies are designed to be removed from the monitor rack while the

monitoring system is powered up; this is called Hot Swapping. The monitor will placeitself in bypass when it is reinstalled, and during the time period required for it to go

through its self-test process.


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Hot Swapping Components

As mentioned earlier, monitors and power supplies (one at a time) can be removed with

the power applied to the rack. However, it is recommended that the following not beHot Swapped:

the Rack Interface Module (RIM) and Transient Data Interface (TDI);

communications to outside devices and monitor management will be lost causing

unreliable or unexpected results I/O modules are not designed for removal during power on conditions. For safety

reasons, as well as for potential voltage arcing, power interface modules (PIMs)

should not be removed or installed with power applied to the device

finally, considering that there are usually several wires and cables in the back of a

monitoring rack, any of which could be bumped, and possibly cause problems, it isgenerally a good practice, when possible, to only work behind the monitoring

system when the power to the rack is off, and the machine is not running


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Review

Wiring, miswiring, system jumpers

Monitor configuration

Use of proper I/O modules

Firmware and hardware compatibility

Bypassing or disabling monitors

Hot swapping monitoring system

components

Name some wiring conditions that could stop the data transfer from the transducer system

to the monitoring rack.

Identify some monitor configuration issues that could cause problems with the

monitoring system.

Explain what could happen if older monitors are used with newer monitoring systems,and identify the way this can be resolved.

Explain how monitors can be bypassed using the display or configuration software.

Explain some rules or guidelines for Hot Swapping monitors and I/O modules.


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Troubleshooting the

3500 Monitoring System

Topic Objectives Revisited:

You will be able to explain the various kinds of problems that can potentially occurwith a 3500 monitoring system installation.


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T14_Troubleshooting the 3500 Monitoring System

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