Bently3500 System Overview

15. The 3500/62 is designed to accept static proportional signals such as 4 to 20 mA, 1 to 5 Vdc, or any static proportional signal between –10 and +10 Vdc. When dynamic signals (i.e., those where waveform information is required) are used, a 3500/40M or 3500/42M can often be programmed as a custom channel type to such signals, making the 3500 system compatible with virtually any static or dynamic signal from pressure, level, temperature, vibration, flow, position, speed, or other transducers. Consult the factory or your local Bently Nevada sales professional for more information. 

16. The 3500/64M is primarily intended for monitoring combustor pressure pulsation instabilities (“humming”) in gas turbines.

Relays1

The 3500/34 TMR Relay Module works in conjunction with a special TMR Rack Interface Module and three monitor modules to provide 2-out-of-3 voting for inputs. Relays are epoxy-sealed and installed arc suppressors are standard. Users can program relays for either normally energized or normally de-energized operation. The 3500 Rack also supplies a common system OK relay2 in addition to any alarm relays in the rack. This relay is located in the TDI/RIM’s I/O module and is connected to the OK circuits of all modules in the rack. These circuits monitor the operating condition of each module. Any fault in the module, its transducers, or associated transducer field wiring will be annunciated by the OK relay. This relay is a singlepole, double-throw (SPDT) type and is normally energized, providing added capability of annunciation in the event of primary power loss.

Notes:

1. Although not a required component of the 3500 System, we strongly recommend relays as the appropriate way to interconnect the 3500 System in auto-shutdown applications. Analog (e.g. 4 to 20 mA) and digital (e.g. Modbus*) connections are intended for operator annunciation and trending purposes and do not provide the fault tolerance or integrity necessary for highly reliable machinery shutdown purposes. 2. Dozens of possible event conditions within the rack can drive the NOT OK relay. For this reason, it is not intended for use as part of a

Notes:1. For this mounting option only, the Display Interface Module (DIM) must occupy slot 15 (right-most slot) of the rack. 2. With the use of a special external power supply, the display can be located up to 1219 metres (4000 feet) from the 3500 System. 3. It is recommended that the display be located within 7.6 metres (25 feet) of the 3500 rack., as the video driver circuit is optimized for this range. Lengths above 25 feet will degrade the picture quality. When an extension is necessary, a special KVM Extender is available. However, even with the KVM Extender, there will be some reduction in picture quality. Typically, the picture image will still be acceptable. The KVM Extender must be used indoors, and it is not rated for use in hazardous areas. 4. Distances greater than 4000 feet are supported when Ethernet, rather than serial communications, is used between the rack and the 3500/95 display. Wireless Ethernet can also be used.

Intrinsic Safety Barriers or Galvanic Isolators

For applications where the transducers are located in a hazardous area, the 3500 System can be used with internal or external intrinsic safety barriers. However, the 3500 option for internal safety barriers is generally preferable to external barriers because this option saves cost, requires no extra cabinet space, and needs no additional wiring. Internal barriers improve safety because the connections are pre-wired, reducing the possibility for errors introduced by wiring additional external connections between monitors and barriers. Internal barriers also improve quality because, unlike external barriers, they require no special monitor scale factor calibration to compensate for voltage drop across the barrier. For additional information on 3500 internal barriers, refer to datasheet 141495-01. For those that prefer the use of galvanic isolators to address intrinsic safety requirements, preengineered external galvanic isolators and an appropriate housing are available. For additional information on 3500 galvanic isolators, refer to datasheet 141714-01.

Applications

The 3500 System is intended for continuous, permanent monitoring of rotating and reciprocating machinery in a variety of industries. It is specifically designed for use in auto-shutdown machinery protection applications that require extremely high reliability and availability. Machine types addressed by the 3500 System include but are not limited to: Industrial gas and steam turbines in power generation and mechanical drive service Aeroderivative gas turbines in power generation and mechanical drive service Hydraulic (Hydro) turbines in power generation service Compressors (air/process gas, radial/axial, centrifugal/positive displacement) Turbo Expanders Electric motors and generators Exciters Gear boxes Pumps (centrifugal and positive displacement) Fans Blowers Reciprocating compressors Extruders and pelletizers In addition, GE’s Bently Nevada Custom Products engineering, can often address special requirements for custom configuration of an existing monitor type or modifications to a standard monitor type. Contact your local sales professional for further information.