Bently Nevada 135489-01 Closed Rack Interface I/O Module

Description

The number of pulses in a speed transducer signal for each shaft rotation. If

the speed transducer is observing a multi-tooth gear, set the Events Per

Revolution to the number of teeth on the gear. Enter the desired events per

revolution either as a decimal value (0.0039 to 255) or as a fractional value

by entering the Events Per Revolution numerator (1 to 255) and denominator

(1 to 255). A fractional value is always calculated and displayed because the

Tachometer uses the fractional value in its calculations. If you enter a non

integer Events Per Revolution, the software will determine which fractional

value most closely approximates this value and display the associated

numerator and denominator. The software will also calculate and display the

percentage of error between the desired decimal value and the approximated

fractional value.

To set the Tachometer to proper EPR, enter the decimal value into the

Desired EPR box. The software calculates the closest fraction found which

is EPR = 157/4 = 39.25. Since 157/4 = 39.25 and not 39.2727, a slight error

will result. In this particular example, the error is 0.0578 % or 2 rpm at 3600

rpm.

Alarm Mode

Latching

Once an alarm is active, it will remain active even after the proportional

value drops below the configured setpoint level. The channel will remain

in alarm until it is reset by using one of the following methods:

Pressing the reset switch on the front of the Rack Interface Module

Closing the reset contact on the Rack Interface I/O Module

Selecting the Rack Reset command in the Rack Configuration or

Operator Display Software

Issuing the reset command through the Communication Gateway or

Display Module.

When an alarm is active, it will go inactive as soon as the proportional

value drops below the configured setpoint level.

Alert/Alarm 1 should be the first level alarm that occurs when the

transducer signal level exceeds the selected value. Danger/Alarm 2

should be the second level alarm that occurs when the transducer signal

level exceeds the selected value. The Alert/Alarm 1 and Danger/Alarm 2

values are set on the Setpoint screen.

The Zero Speed function requires inputs from two transducers. Voting

logic between the two transducers minimizes false Zero Speed indication

in the event of a transducer failure. To meet the Zero Speed alarming

requirement, both transducers must have a valid input below 100 rpm,

both transducers must observe the rotor speed fall below the Zero Speed

setpoint for three consecutive readings, and the Zero Speed Enable

switch must be enabled. If both transducers read zero rpm input for one

minute and Zero Speed alarming is enabled, a Zero Speed alarm will

occur.

This section specifies the available setpoints for each type of Tachometer

channel. A setpoint is the level within the full-scale range that determines

when an alarm occurs.

The 3500 Monitoring System allows Alert/Alarm 1 setpoints to be set for

every proportional value (except peak speed) on each channel. The channel

will drive an Alert/Alarm 1 indication if one or more of the channel proportional

values exceeds its setpoints.

The 3500 Monitoring System also allows up to four Danger/Alarm 2 setpoints

(two over setpoints and two under setpoints) to be set for up to two of the

proportional values for Rotor Speed and Rotor Acceleration Channel types.

The Zero Speed Channel type allows only one Danger/Alarm 2 setpoint (Zero

Speed under).

With the Reverse Rotation channel type, one Danger/Alarm 2 setpoint is fixed

at zero to facilitate alarming when a reverse rotation condition is detected.

The other Danger/Alarm2 setpoint is configurable.

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