BK Vibro VIBROCONTROL 6000 - Cycle-DC Measurement; Function

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Cycle-DC measurement Part C VC-6000

Compact monitor

Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 55 -

18 Cycle-DC measurement

18.1 Function

♦ The Cycle-DC value describes the quasi-static DC part of a signal (DC

signal, DC-component of an AC/DC signal), whereby the measurement

acquisition is sychronized with a trigger cycle.

♦ The Cycle-DC measurement is an optional signal path component. As a

configuration interface it contains all the parameters necessary for the

measurement setup.

♦ The Cycle-DC measurement is most often used to

monitor the wear of the piston rings in a reciprocating

compressor. The wear is determined from the vertical

displacement of the con-rod and assessed by observation

of the trend of the value (Rod-drop monitoring).

♦ The physical unit of the Cycle-DC measurement is determined in the

preceding component in the signal path, in particular through the

Sensor / Sensor(A/B) Block.

♦ The Cycle-DC measurement requires two sensor signals

• One sensor for the measurement variable and

• one reference sensor for the trigger signal.

♦ The Cycle-DC value to be calculated is averaged over an adjustable

number of trigger cycles. New measured values are available only when

the averaging time has expired.

♦ The current measured value can be read through the User Terminal.

♦ The current measured value can also be fed to downstream electronic

equipment through an analogue DC output.

♦ The current measured value can also be read through the COM-

interface of a downstream OPC-server.

♦ The Cycle-DC measurement can be monitored for limit violation through

one or more Monitor blocks.