Dual-Monitor (2 absolute limit values) functionPart C VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 65 -
21 Dual-Monitor (2 absolute limit values)
function
♦ The Dual-Monitor(Absolute) block is responsible for limit monitoring with
two absolute limit values. In the User Menu the block name is
abbreviated to D.-MONI.(Abs.).
♦ The Dual-Monitor(Absolute) block is an optional signal path component.
As a configuration interface it contains all the necessary parameters for
the settings.
♦ The Dual-Monitor(Absolute) block processes the measured values from
preceding measurement blocks (e.g. RMS-measurement, BCU-
measurement, etc.). These measured values are compared with the
absolute limits of the Alert alarm and Danger alarm setpoints. At an
over-exceedance of the limit value (positive limit violation type) and after
an adjustable time delay the corresponding event (Alert alarm or Danger
alarm) is released and an alarm relay is activated. In the case of an
under-exceedance (negative) limit violation type the comparison of the
measured values is done by a negative limit violation.
♦ Very often the Dual-Monitor(Absolute) block directly controls a relay
output. If this is the case the LEDs on the relay output module are used
to signal the monitoring condition (see the chapter about Relay block in
section C and the chapter on Signalling in section A).
♦ If required the Dual-Monitor(Absolute) block can operate with an
automatic Trip-multiplier function.
This function is nevertheless dependent upon the respective instrument
configuration.
♦ The Dual-Monitor(Absolute) block has a parameter called „Fail-safe
danger“. This parameter determines the behaviour of the Danger alarm
message when no valid measurement is existing, e.g. when there is a
sensor OK-fault.
21.1 Parameters and setting ranges
21.1.1 Parameter list
♦ <Limit type>
This parameter defines whether the Dual-Monitor block monitors the
measurements by positive or negative violation of the set limit values.
With a setting of an upper limit a positive violation is monitored, with a
setting of a lower limit a negative violation is monitored. The settings are
valid for both limit values of the Dual-Monitor block. The settings can be
changed at the instrument.
Limit type Upper limit or lower limit
Works pre-setting Upper limit
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