Bently 3500/40M Proximitor Displacement Monitor 3500/40-01-00

Description

3500/40M-01-00 This section covers the failure modes of the 3500/32M_SIL and 3500/33_SIL relay modules and

theirinternal diagnostics system. The estimated failure rate for each of these failure modes are

given after each subsection of the corresponding failure mode.

The failure rates are driven by 3500/40M-01-00 the following assumptions:

l Failure rates are based on Siemens standard SN 29500 and the outlined maximum

temperature limits shown underthe user manual of the relevant component.

l The failure rate is constant overtime.

l The listed failure rates are in Failure in Time (FIT) = fit = [10-9 1/h]

3500/40M-01-00 The specific failure modes of the 3500/32M_SIL and 3500/33_SIL modules are detailed in the

FMEDA report, which is included in the SIL report which is available from GE Bently Nevada.

5.2 Failure modes that are not detected by internal

diagnostics

When a failure mode occurs in a 3500/32M_SIL and 3500/33_SIL module that is not capable of

being detected by the internal diagnostics of the module, the condition is not reported, 3500/40M-01-00 there is no

adjustment of the relay output states, and the RackOK relay does not change state. This is the

case whetherthe failure is safe or dangerous.

5.3 Failure modes that are detected by internal diagnostics

The 3500/32M_SIL and 3500/33_SIL modules feature internal diagnostics capabilities. When any

failure is detected by the diagnostics, the module responds by annunciating the condition, and

driving the RackOK relay on the 3500/22M TDI to the “Not OK” state. In cases where a fault occurs

that prevents the module from conducting its internal diagnostics and communicating with

other system components, the 3500/22M TDI Module is capable of detecting the loss of

communications, and responds by driving the RackOK relay to the “Not OK” state.

When faults are detected by the module, the 3500/22M TDI records the failures in the 3500 System

Event List. Referto the “System Event List Messages” sections in the 3500/32M operation manual

(Part number 129771-01) orthe 3500/33 operation manual (part number 162291-01) for a full list of

failure codes that are detected by the internal diagnostic system.

5.3.1 Diagnostic test interval

3500/40M-01-00 The cycle interval between internal diagnostic checking is 1 hour maximum. In the vast majority

of cases the interval is farless. The specified one hourinterval is based on the fact that all of the

diagnostics checks may take up to 1 hourto complete under worst-case conditions.

5.3.2 System Outputs

For any failure modes that are detected by the 3500/32M_SIL and 3500/33_SIL monitors by the

internal diagnostic system, the RackOK relay will drive to a NOT OK state.

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