Bently Nevada 3500/42 Velocity Acceleration Monitor

Description

The 3500/32M_SIL and 3500/33_SIL are designed to be used in a 3500 system that includes at

least one SIL certified monitorinstalled and used in conjunction with the SIL certified relay module

(s). As described in sections 5.2 and 5.3, in addition to providing 3500/42 safety relay output functionality to

the safety-related system, the 3500/22M TDI Module also provides a measure of external

diagnostic capability to the module in the event that the monitoris rendered unable to

communicate to the other system components. This external diagnostic functionality is

established by simply installing the relay module 3500/42 in a properly constructed SIL 3500 system .

The 3500 system supporting the SIL certified monitor must have a 3500/22M TDI module installed.

3500/42 The Rack interface monitor performs diagnostics on all the monitors and I/O’s installed in the

Rack which are separate from the individual monitorinternal diagnostics. When the Rack

Interface Monitor senses a failure mode of one of the installed monitors, it changes the RackOK

relay to the Not OK state. Referto the FMEDA report, which is available from GE Bently Nevada

underthe SIL Report, for all failure modes that drive the RackOK Relay

3500/42 The circuit boards and components inside 3500 modules cannot be repaired in the field. 3500

rack maintenance consists of testing module channels to verify that they are operating correctly.

Monitors and modules that are not operating correctly should be replaced with a spare.

When performed properly, you may install the 3500/32M or 3500/33 controller module into or

remove the module 3500/42 from the rack while poweris applied to the rack, except when the rack is in a

hazardous area. A hazardous area is defined by document BS EN 60079-0:2012 as an area in

which an explosive atmosphere is present, or may be expected to be present, in quantities such

as to require special precautions forthe construction, installation and use of electrical apparatus.

Referto the Rack Installation and Maintenance Manual (part number 129766-01) forthe proper

procedure.

6.1 3500/42 Choosing a Periodic Proof Test Interval

The proof test coverage provided by the internal diagnostic functionality of the 3500/32M_SIL

and 3500/33_SIL monitors is 93%. Those dangerous failures that fall outside of the monitor’s

diagnostic capability are considered dangerous undetected failures which must be detected as

part of periodic proof test activities.

GE Bently Nevada Recommends a periodic proof test interval of 1 year but by using the PFDAVE

equation from 61508-6 that is appropriate forthe 3500/42 specific safety-related system, the effect on the

PFDAVE value can be determined forlonger or shorter periodic proof test intervals.

6.2 Periodic Proof test guide

3500/42 The test setup for verifying a Relay Module involves making connections to the monitor channels

involved in the relay drive logic in orderto simulate the monitorinputs. The inputs will be adjusted

to exercise the SIF’s relay logic, and verify that each of the relay contacts on the Relay Output

Module are performing as intended. Note that if redundant relays are used, as shown in Figure 4-

3 or 4-5, it is important to verify both sets of contacts. Reference the individual operation and

maintenance manuals for each monitor used in the SIF’s relay drive logic forthe monitor-specific

verification details.

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