ensure that memory has not been corrupted by comparing configuration information for agreement and flagging any anomalies. The use of redundant, non-volatile memory also allows the user to program the module ahead of time for spare parts, and ensures that, in the event a redundant power supply is not used, monitor configuration is not lost when power is interrupted and monitoring functions can resume immediately upon reapplication of rack power.
In many cases, the 3500 rack can be mounted on or near the machine skid or local control panel, keeping cable runs between the 3500 rack and the machine shorter and less costly. Wired and wireless communications and display options permit the installation to make a single Ethernet connection between the control room and 3500 rack. This also permits installations to distribute display and other information needed, whether to a process control system or to an engineer’s desktop computer. The result is a machinery protection system with significantly lower installation costs than those that must be mounted in only control room environments. Optional NEMA 4 and NEMA 4X
weatherproof housings are available when installations require field mounting of the 3500 System.
Modem, WAN, or LAN connections allow the user to remotely configure a 3500 system and even assess the system when an instrument problem arises. Users can implement simple changes, such as to an alarm setpoint or a filter corner, without traveling to site. This is ideal for such installations as offshore platforms, compressor or pump stations, emergency generators, and other locations where on-site access to the instrumentation is inconvenient or impractical.
The 3500 System’s two levels of password protection combined with a keylock for configuration changes ensures the system can’t be adjusted, changed, or configured except by those authorized to do so. Users can document and control management of change much more easily, and the 3500 rack records any configuration changes in the system’s event list.
The 3500 System goes well beyond the capabilities of previous systems to simply identify the first alarm to occur in the rack via a “First Out” feature. Extensive alarm and event lists retain the 1000 most recent alarm and 400 most recent system events (configuration changes, errors, etc.). The system’s TDI/RIM retains the lists, which provide a description of each alarm or event and a corresponding date/time stamp. These lists are available to 3500 displays, 3500 Operator Display Software, and the Communications Gateway module for export to process control, historian, or other plant systems.
The system’s real-time clock can be synchronized with external clocks, via the Communications Gateway or via connected Bently Nevada software. The 3500’s alarm and event lists then provide time/date stamps that are synchronized with alarms and events in other process and automation equipment. This reduces or eliminates the need for elaborate, hardwired “Sequence of Event” recorders.
API 670 Compliance
When configured properly, supplied with the correct number of relay modules, and provided with an appropriate optional display, the 3500 System fully complies with the latest edition of the American Petroleum Institute (API) Standard 670 for Machinery Protection Systems, covering shaft-relative vibration, axial position, temperature, reciprocating compressor rod drop, tachometer, overspeed detection, and casing vibration.
All modules and Power Supplies (when redundant supplies are used) can be removed or inserted when the rack is under power. This facilitates easier maintenance and system expansion without interruption of machinery protection functions or system operation.
Note: Before removing an I/O module, the front-panel portion of the module must first be removed. This removes power from the
Specifications and Ordering Information Part Number 162096-01 Rev. F (03/07)
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