Measurement Technology NW
LCI-90 Operator Manual
Page 44
Item 5 Sets the analog output offset (see Section 6.4.1).
6.4.1 Calibrating the analog output signal
Items 4 and 5 in the
4.2 ANALOG OUTPUT CONFIG
menu allow the analog out-
put for a given line variable to be scaled in any way the user desires. Item 5 specifies
the "offset", which is the value of the variable that corresponds to the lower limit of
the output range – for example, the value that produces 4 mA or 0 V. Line values be-
low the "offset" usually produce the same (minimum) output (some 4-20 modules
can generate currents less than 4.00 mA). Similarly, item 4 specifies the value of the
line variable that corresponds to the upper limit of the output range, i.e. 20 mA or 5
V, etc. Line values above the "full scale" value generate the same (maximum) out-
put. This flexible arrangement allows the LCI-90 to meet the requirements of almost
any conceivable data system or output device.
6.5
Alarm Configuration
The
4.3 ALARM CONFIGURATION
menu is distinct from the
1.0 SET ALARMS
menu, which was described in §5.3.2.
Set Alarms
allows one to conveniently change the
value
of a 'trip point', while
Alarm Configuration
allows the user to disable the alarm
completely, change the variable associated with the alarm, or change the alarm from a
"High" (value above) to a "Low" (value below) condition. Menu
4.3
described below can
be reached either through Item 7 of the
1.0 SET ALARMS
menu, or Item 4 of the
4.0
SYSTEM CONFIGURATION
menu.
4.3 ALARM CONFIGURATION
>
1
ALARM NO.
3
2
VARIABLE
PAYOUT
3
OUTPUT TO
SCR+OP2
4
ALARM TYPE
HIGH
5
LIMIT
1000 FT
6
DEADBAND
20 FT
Item 1 Selects one of the six available alarm settings. Each alarm, when activated, dis-
plays a message on the RUN SCREEN that remains until the alarm condition dis-
appears, and optionally turns on one of the four Output modules, which can be used
to signal a remote data system, flash a light or sound an alarm.
Item 2 Selects the line variable to be monitored. The choices are
NONE
,
TENSION
,
SPEED
and
PAYOUT
. A setting of
NONE
disables the remaining items.
Item 3 Specifies what happens when the alarm is activated. See Section 6.5.3 for details.
Item 4 Specifies whether the alarm is turned on when the value is above the limit (
HIGH
)
or below the limit (
LOW
). See Section 6.5.1.
Item 5 Sets the limit above or below which the alarm occurs. If the variable is assigned to
the top display, this value also appears as a 'tick mark' on the bar graph. The limit