Description

All the Alert/Alarm 1 setpoints are provided first, followed by the configured

Danger/Alarm 2 setpoints.

Example 1:

A Tachometer configured for Rotor Speed with the Danger/Alarm 2 Over

Speed and the Danger/Alarm 2 Under Speed setpoints selected.

Alert/Alarm 1 setpoints:

setpoints 1 through 4

Danger/Alarm 2 setpoints:

setpoint 5 is Over Speed (Danger/Alarm 2)

setpoint 6 is Under Speed (Danger/Alarm 2)

Example 2:

A Tachometer configured for Zero Speed with the Danger/Alarm 2 Zero

Speed Under setpoint selected.

Alert/Alarm 1 setpoints:

setpoints 1 through 3

Danger/Alarm 2 setpoint:

setpoint 4 is Zero Speed Under (Danger)

The alarming hysteresis for all setpoints is 10 RPM (with the exception of

Zero Speed which is configurable). When a channel exceeds an alarm

setpoint, it must fall back below the setpoint less the hysteresis before it

can go out of alarm. For example, consider a channel with an alarm

setpoint at 4250 RPM as illustrated. The channel input must fall below

4240 RPM (4250 – 10) before the channel is out of alarm.

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BENTLY	modular	135489-02	nothing
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Product features	Primary source of goods, supply by model	After sales guarantee	Chen 1810693-7731

The Tachometer Monitor supports four module software switches and four

channel software switches. These switches let you temporarily bypass,

inhibit, or invoke monitor and channel functions. Set these switches on the

Software Switches screen under the Utilities Option on the main screen of

the Rack Configuration Software.

A switch that allows the monitor to be configured. To configure the

monitor, enable ( ) this switch and set the key switch on the front of the

Rack Interface Module in the PROGRAM position. When downloading a

configuration from the Rack Configuration Software, this switch will

automatically be enabled and disabled by the Rack Configuration

Software. If the connection to the rack is lost during the configuration

process, use this switch to remove the module from Configuration Mode.

Monitor Alarm Bypass

When this switch is enabled, the monitor does not perform alarming

functions. All proportional values are still provided.

Manual Keyphasor Threshold Adjust

Used when adjusting the manual threshold. This switch will automatically

be enabled and disabled when the Adjust button on the Tachometer

Monitor Options screen is pressed. When in this mode the Tachometer

Module will operate with a temporary Manual Threshold supplied by the

Rack Configuration Software. Proportional values may go invalid,

alarming will be bypassed, and Conditioned Keyphasor will not be

supplied while the Manual Threshold is being adjusted.

Zero Speed Enable

The Zero Speed Enable switch is a permissive switch that allows alarms

to occur for Zero Speed and Reverse Rotation. When the switch is

enabled, these alarms will occur when the alarm condition is present. If

the switch is not enabled, the alarms will be bypassed even when the

alarm condition is present.

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Bently Nevada 135489-02 Channel input module

Description

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