50
6.3.3 Operate
The unit enters its
OPERATE
state when it successfully leaves the Setup state. When in the
OPERATE
state
the system is operating normally, i.e., compensated axial magnetic field values at the probe are below the Trip
thresholds and no system faults are detected.
While in the
OPERATE
state, if a POWER Trip occurs, typically due to an A.C. power mains dropout of 1 second
or longer, the unit will initiate a full reboot and progress through the
ACQUIRE
,
RAMP UP
and
SETUP
states back
to the
OPERATE
state.
If there is a X, Y or Z Trip
OVERLEVEL
condition that lasts longer than 4 seconds, the unit will go to the
OVERLEVEL
state, disable the CDA, and wait for a firmware-specified time
⁸
before performing an Auto Reset
initialization (
INITIALIZE-AR
) to initiate an
ACQUIRE
sequence. This process will repeat a firmware-specified
number of times; if a successful
OPERATE
state has not been achieved, the system will enter a second loop with
a second set of firmware duration and repetition parameters. On completion of the second loop without attaining a
successful
OPERATE
state, the system shuts down with a
DISABLE-AR
command.
6.3.4 Overlevel
An
OVERLEVEL
state can only occur
when in the
OPERATE
state and a
Trip
OVERLEVEL
condition is detected
,
i.e., one or more axial magnetic field levels is equal to or exceeding the associated Trip threshold settings. This
condition can occur, in order of decreasing probability, for a) accidental disturbance of the sensing probe, b)
failure of one or more system components, or c) a significant increase in the interfering field source intensity.
6.3.5 Disabled
There are two system
DISABLED
states, either
DISABLED-AR
or
DISABLED-PB
; the actual state will be
recorded and displayed locally on the system front panel and also remotely on the HTML pages for diagnostic
purposes.
DISABLED-AR
indicates that the system has tripped off after its normal Auto Reset sequence, due to
an
OVERLEVEL
condition detected in one or more axes.
DISABLED-PB
indicates that the MACS/D system has
been manually put into standby mode by someone pressing the MXA front panel RESET pushbutton.
DISABLED-AR
signals that an abnormal condition has occurred while the system is in its normal
OPERATE
state. The unit will stay in this state until it is reset, either by pressing and releasing the RESET pushbutton
switch or by a remote reset from the Trace HTML page. A system shutdown may be due to an accident where the
probe has been bumped or otherwise misaligned, or a large conductive or ferromagnetic object has been placed
in close proximity to it, in which case the customer may be able to correct the problem. If remote diagnostics
clearly indicate a component failure or increase in interfering fields, then a site visit by a qualified field engineer is
necessary.
6.4 USING THE WEB UI
All MACS/D system controls, parameters and parametric coefficients can be operated and/or loaded both locally
and remotely from the HTML user interface (UI) pages, as described in
Section 4: HTML User and Development
Interface
, which presents detailed information on setting up the MACS/D Internet Protocol remote operation and
capabilities. Access to MACS/D system signal processing data and operating parameters beyond axial interfering
field values is available only by means of the system network-accessible HTML pages.
Information displayed on the MXA controller’s front panel LCD screen, as well as the Status and PushButton (PB)
red/blue indicators, are intended for summary monitoring by site operators and, for operator convenience are also
viewable in the same format on the Trace page of the web UI. Operation of system controls appearing in HTML
pages, with the exception of the intensity adjustment for the MXA panel LED’s, requires a password to gain access.
⁸ See MACS/D STATE FLOWCHART Table, Appendix A.3.
