Category: Bently

MONITOR FUNCTIONS

SYSTEM POWER-UP INHIBIT

The System Monitor provides a Power-up Inhibit function. This function allows each monitor to

inhibit its alarms during power-up or whenever a system supply voltage falls below its operating

level. After power-up, the inhibit function remains active for approximately 2 seconds.

RACK INHIBIT

When activated by a external contact closure this function places all monitors in bypass, disables

all alarms, zero scales all outputs, and de-energizes the system OK relay. The connections for this

function are located on the power input module (PIM) at the rear of the rack.

TRIP MULTIPLY

The most common use of this function is to prevent unwanted monitor alarms during certain

conditions of machine operation. In the operation of some machinery, it is impossible to avoid

some periods of “higher than normal” vibration. Examples include startup and coastdown,

especially if the operating speed is above rotor system balance resonances (“critical speeds”),

structural and other resonances, and changes in machine load or other operating conditions.

The Trip Multiply function causes the monitor alarm setpoints (both Alert and Danger) to increase

by a fixed amount, either two times (2X) or three times (3X), according to the ordering option. Only

those monitors ordered with this option will be affected. The Trip Multiply function is performed in

the System Monitor, but is an ordering option for each monitor. It must be specified at the time of

order placement and be installed at the factory.

Trip Multiply is activated by contact closure on the PIM. A red LED on the System Monitor front

panel indicates that the Trip Multiply function is active.

Description

Relays are important to the integrity of monitoring systems. They provide

external alarm annunciation or input to an automatic shutdown device. You can

order 3300 monitors with quality, built-in relays. Installation requires no external

wiring between relays and rack, and no extra housing to mount the relays. This

facilitates installation and minimizes the chance of errors associated with field wiring.

The 3300 system offers 2 relay module types:

• Dual, with 2 relays per module

• Quad, with 4 relays per module.

For system installations on the machine deck, in hazardous areas, or in areas

with harsh environments, the dual relay module is available with hermeticallysealed relays.

For non-hazardous areas and clean environments such as control

rooms or instrument panels, modules with epoxy-sealed relays are available.

All relay modules include arc suppressors as a standard feature to increase the

life of the contacts by reducing arcing at the switching point.

General Installation Procedure

1. Review the Installation Checklist (see Section 3.2).

2. Install the Weatherproof Housing (if required) (see Section 3.3).

3. Install the rack (see Section 3.4).

4. Set the jumpers and switches on rack (see Section 3.8).

5. Install the External Termination Blocks (if required) (see Section 3.5).

6. Install the modules (see Section 4).

7. Wire the transducers, relay, and power to the rack and modules (see Section 3.9).

8. Perform the Software Portion of the Rack Installation (see Section 3.10).

Installation Checklist

Use the following items to plan a 3500 rack installation:

• What are the power requirements?

• Does the rack fit in the proposed location?

• Can you mount the rack in the proposed location?

• Does the proposed location provide enough air circulation?

• Does the rack require a weatherproof housing?

• What termination does the rack require (internal or external)?

• Does the rack require a telephone line?

• Does the location provide good grounding for the rack?

• If you plan to fit Internal Barriers, does the location provide an Intrinsically Safe Earth?

Weatherproof Housing Installation

This section describes the 3500 weatherproof housing and provides instructions for proper installation.

General Description

The 3500/06 weatherproof housing is an enclosure designed to meet NEMA 4 requirements and to contain

one 3500 series rack (rack mount option only). The housing design does not accommodate a Display Unit or VGA display.

The housing is available in painted steel or stainless steel versions, with or without conduit fittings, and with or without air purge accessories.

A hinged door provides access to the front of the rack. A bolt-on cover provides access to the rear of the rack.

To provide Intrinsically Safe (IS) vibration and process variable monitoring,

the 3500 system has a range of I/O modules with internal zener barriers.

When you install these modules in a 3500 rack with a 3500/04-01 Earthing Module, 

they provide an integrated solution for explosion protection for approved Bently Nevada

transducer systems that are located within all classifications of hazardous areas (surface industries other than mining).

3500 Internal Barrier System Restrictions

• You must install 1 earthing module in each rack in the internal barrier system. 

The earthing module occupies 1 slot position in the rack when it uses Internal Barrier I/O modules.

• You must change the grounding configuration of the 3500/15 Power Supplies from the default factory setting.

See the 3500/15 Operation and Maintenance Manual (PN 129767-01) for instructions.

• You must isolate any RS-232 connection to any 3500 module. Monitors that support RS232 connections include Rack Interface Modules, 

Communication Gateways, and the 3500/95 PC Display. See the 3500/20 Operation and Maintenance Manual (PN 129768-01) for instructions.

This restriction does not apply to RS422 and RS485 connections to the rack. 

Monitors that support RS422 and/or RS485 connections include the 3500/20, 3500/90, 3500/92, 3500/93, and 3500/95.

• You must not use the 3500/94 VGA Display in internal barrier systems.

• You must not use bussed transducers, as internal barrier systems do not allow bussed transducers. See the TMR section of this manual for more information.

3500 Internal Barrier System Features

• The earthing module supports dual IS Earth connections for cables with cross-sectional areas up to 10 mm2. This module lets you test IS Earth continuity online.

• The design of the internal barrier I/O modules provides the 2 inches (50 mm) of separation required between safe and hazardous area field wiring.

• The connectors for safe areas and hazardous areas have different field wiring colors (green for safe and blue for hazardous) and connector pitches. 

This helps to avoid incorrect field wiring installation.

• Quick connect/disconnect connectors simplify field wiring installation and removal.

• You can locate standard and internal barrier I/O modules in the same 3500 rack. 

We recommend that you group the modules together as shown in Figure 2-10 to facilitate connection to field wiring.

Monitoring and computerized vibration information systems provide the information you need to assess the mechanical condition of rotating and reciprocating machinery. These systems continuously measure and monitor various supervisory parameters and provide crucial information for early identification of machinery problems such as imbalance, misalignment, shaft crack, and bearing failures. As such, these systems are an efficient and effective means of satisfying plant management, engineering, and maintenance concerns for:

• Increasing plant safety by minimizing the occurrence of hazardous conditions or catastrophic failures.

• Improving product quality by minimizing process variances caused by improperly operating equipment.

• Maximizing plant availability by servicing only those machines that require it and providing more efficient turnarounds.

• Reducing plant operating costs by minimizing unplanned shutdowns and by making more efficient use of maintenance resources.

For protection of critical machinery, we highly recommend that you permanently install continuous monitoring systems. The term “protection” means that the system can shut down machinery on alarm, without human interaction. These systems include applicable transducers, each with its own dedicated monitoring circuitry and alarm setpoints. The 3500 Monitoring System is the newest addition to the family of continuous monitoring systems offered by Bently Nevada, LLC.

3500 Monitoring System

The 3500 is a full-feature monitoring system whose design incorporates the latest in proven processor technology. In addition to meeting the above stated criteria, the 3500 adds benefit in the following areas:

• Enhanced operator information

• Improved integration to plant control computer

• Reduced installation and maintenance cost

• Improved reliability

• Intrinsic Safety (IS) option

Description

To externally mount proximity probes, use one of these allmetal Proximity Probe Housing Assemblies:

l 21000 aluminum probe housing assembly

l 24701 stainless steel probe housing assembly

The 21000 and 24701 Proximity Probe Housing Assemblies

consist of the following parts:

l A dome cover that screws into the body of the housing

l Threaded ports for conduit connections

l A probe sleeve of optional length

l 0-rings

l A reverse mount proximity probe

l A thread seal

l Optional conduit fittings

l An optional standoff adapter

A newer 31000/32000 proximity probe housing

assembly is available with more flexible mounting

options, better environmental resistance, and other

improved features. We recommend this proximity

probe housing assembly for installations where an

explosion proof housing is not required. See 31000 and

32000 Proximity Probe Housings product datasheet

(document 141610).

The 21000 and 24701 Proximity Probe Housing Assemblies are

available with Canadian Standards Association (CSA)

approvals. They are rated explosion proof for hazardous areas.

You can order hazardous area approved proximity probes

with 21000 aluminum and 24701 stainless steel housings for

intrinsically safe applications. Both housings

are certified as CSA Type 4 enclosures and are

fully compliant with the American Petroleum

Institute’s (API) 670 Standard for externally

mounted proximity probe housings.

Description

The 200350 and 200355 Accelerometers are general

purpose, case-mounted seismic transducers designed

for use with Trendmaster Pro Constant Current Direct

Input Card, part number 149811-02 and the Seismic

Direct Input Card, part number 164746-01.

The 200350 and 200355 Accelerometers are contained

within a hermetically sealed, stainless steel case.  The

design provides an extremely rugged transducer, well

suited for harsh industrial environments.  Each

transducer’s top mounted, 2-pin connector (MIL-C5015) allows for easy installation and removal of the

interconnecting signal cable.  A ¼-28 threaded hole on

the bottom of the casing accommodates multiple

mounting options.

The 200350 and 200355 Accelerometers contain a

piezoelectric sensing device, which generates charge

when subjected to vibration.  This charge is then

converted electronically to a differential voltage signal,

which is proportional to the acceleration that is parallel

to the sensitive axis of the transducer.

Most common machine malfunctions (unbalance,

misalignment, etc.) occur on the rotor and

originate as an increase (or at least a change) in

rotor vibration. For any individual casing

measurement to be effective for overall machine

protection, the system must continually transmit a

significant amount of rotor vibration to the

machine casing, or mounting location of the transducer.

In addition, be careful to install the accelerometer

transducer on the bearing housing or

machine casing.

Description

The 3300/05 rack is a durable, easy to access, expandable mounting medium for

the 3300 Monitoring System. It accommodates a Power Supply, System Monitor,

and various types of 3300 Monitors. Each monitor position in the rack includes a

Signal Input/Relay Module position at the rear of the rack. The rack mainframe is

manufactured in sections from an injection molded plastic; a conductive antistatic

material dissipates electrostatic discharge.

The rack bezel allows you to individually identify machine/monitor points or loop

numbers by using the factory engraved bezel tags or clear plastic strips over

paper tags. The 3300 modular design eliminates the need for internal rack

wiring and allows easy expansion to meet your increased monitoring

requirements.

The left-most position (position 1) of the rack is designated for the Power Supply.

The position next to the Power Supply (position 2) is reserved for the System

Monitor. The other rack positions (3 through 14) are available for any

combination of individual monitors.

Description

The Rack Interface Module (RIM) is the primary interface to the 3500 rack. It

supports a proprietary protocol used to configure the rack and retrieve

machinery information. The RIM must be located in slot 1 of the rack (next to the

power supplies).

The RIM supports compatible Bently Nevada external communications

processors such as TDXnet, TDIX, and DDIX. While the RIM provides certain

functions common to the entire rack, the RIM is not part of the critical monitoring

path and has no effect on the proper, normal operation of the overall monitoring

system. One RIM is required per rack.

For Triple Modular Redundant (TMR) applications, the 3500 System requires a

TMR version of the RIM. In addition to all the standard RIM functions, the TMR RIM

also performs “monitor channel comparison.” The 3500 TMR configuration

implements monitor voting using the setup specified in the monitor options.

Using this method, the TMR RIM continually compares the outputs from three (3)

redundant monitors. If the TMR RIM detects that the information from one of

those monitors is no longer within a configured percentof the information of the

other two monitors, it will flag that the monitor is in error and place an event in

the System Event List.

Description

The 3500/93 System Display is designed to meet the requirements of American

Petroleum Institute (API) Standard 670 and provide local or remote visual

indication of all 3500 Machinery Protection System information residing in the

rack including:

 System Event List

 Alarm Event Lists

 All Channel, Monitor, Relay Module, Keyphasor* Module or Tachometer

Module data

The 3500/93 System Display is configured using 3500 Rack Configuration

Software. The display can be mounted in any of four ways:

1. Face Mounting – display installs directly over the front panel of any full

size 3500 rack using a special hinged support. This permits access to the

rack’s buffered output connectors and user-interface buttons and

switches without disconnecting or disabling the display.

Note: For this mounting option only, the Display Interface Module (DIM)

must be installed in slot 15 (right-most slot) of the rack. The Face

Mounting option is not compatible with the 3500 Mini-rack.