smax measurement Part C VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 45 -
14 s
max
measurement
14.1 Function
♦ An s
max
measurement is a dynamic displacement measurement for
monitoring relative shaft vibration according to DIN ISO 7919. The
measured value formed coresponds to the peak value of the dynamic
excursion of a shaft from its centre position. This is equivalent to the
maximum excursion of the kinetic orbit (orbit peak).
♦ As a rule the physical unit for s
max
measurement is [µm].
♦ An s
max
measurement is an optional signal path component. As a
configuration interface it contains also a number of parameters that
require setting up.
♦ The result of the s
max
measured value is updated in virtual real-time with
dynamic measurement.
♦ The behaviour of the s
max
measurement in terms of time is determined
by the variable parameters ‘rise time’ and ‘decay time’.
♦ The current measured value can be displayed on the User Terminal.
♦ The current measured value can also be given as an analogue DC
output signal for use by external electronic equipment.
♦ The current measured value can be read through the COM-interface of
a downstream OPC-server.
♦ The s
max
measurement can be monitored through one or more Monitor
blocks for limit setpoint violation.
14.2 Parameters and their setting ranges
♦ <Rise time>
The rise time parameter corresponds to the charge time-constant of the
s
max
measurement. The rise time can be changed within its setting
range.
Setting range for the time-constant of the rise time:
Minimum: 0 ms Maximum: 99 ms Step size: 1 ms
Worke pre-setting 3 ms
Advice for setting the rise time:
A longer rise time tends to smooth out fast changes in the signal
progression. The resultant s
max
value will be lower in value than with a
shorter rise time.
With a rise time of 0 ms the actual maximum value in the progression of the
signal is acquired as the s
max
value.
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