STX Signal Transmitter Installation and Operation ... - Kistler-Morse

Chapter 8. MVS-STX Service Menu
• Material tracking establishes a reference
when material movement within a
vessel has become stable (rate of change
is below the threshold) during filling and
batching processes. This reference is
then used to maintain and hold steady the
outputs. When the change in raw voltage
falls within the drift limit (factory set at
± 5.00 mV), the corrected voltage and
counts remain those associated with the
reference weight. The correction is done
by the algebraic addition of a correction
offset to the A/D converter output. The
maximum accumulated correction offset
is limited to ± 5.0 mV. If the accumulated
drift exceeds 5.0 mV, the STX begins
tracking the material movement, which
may be caused by a slow leak in the
vessel. Material tracking affects setpoints,
current output, and serial output as well
as the channel monitoring display.
The selections for Trk apply only to the
current channel.
Tracking can be used in any of the
following combinations:
• No zero or material tracking
• Zero tracking only
• Material tracking only
• Zero tracking and material tracking
Trk has four submenus:
Win (window size)
This function sets the maximum plus or minus
offset value for zero tracking. If the minus
offset value is exceeded, the MVS resets the
zero calibration point. The default is .00 mV —
at this value, zero tracking is turned off.
Matrl (material tracking enable)
This function turns material tracking on and
off. The default is Off.
Rate
This function sets the threshold rate in
uV/sec for both zero and material tracking.
When the rate of change exceeds this value,
indicating that material is actually moving, the
STX stops tracking until the rate of change
again falls below this value. The default is
± 5.0 uV/sec.
Dflt (default)
This function resets the zero and material
tracking parameters to factory-set defaults.
SetPt (setpoint relays)
This menu turns the setpoint relays on and off
for test purposes. The MVS displays a
warning that automatic control of the
setpoints assigned to the currently selected
channel is transferred to manual control, and
requests verification.
CAUTION
Manually activating setpoint relays
may cause damage if control equipment
is connected. Disconnect control
equipment before proceeding.
A typical setpoint test display looks like this:
SP 01: Ad 14: Ch1
F1 F2 F3
• SP 01 is the setpoint reference number
(referred to as SP1 in the I/O Menu).
• Ad 14 is the Relay Output PCB’s
hexadecimal address — first rack (‘1’),
fourth position in the rack (‘4’).
• Ch1 is the setpoint channel number on
the Relay Output PCB — each Relay
Output PCB has eight channels.
• ON indicates setpoint status. Press the
F1 Key to toggle between On and Off.
• Manual is not functional at this time.
Press the Arrow Keys or Enter Key to toggle
between the setpoints for the current channel.
Press the Esc or Auto/Man Key to terminate
the test. Once the test is terminated, the
setpoints return to automatic control.
4/20
ON
This menu allows you to:
Manual
• calibrate the 4/0 and 20 mA output
to the device that is receiving the
current output
• reset the current output to default
parameters (MVS only; does not apply to
current output on STX PCB)
• set the current output to specific values
for test purposes
Selection of MVS or STX in the 4/20 Menu
determines the PCB for which the current
output is calibrated, reset, or tested:
8-6