Measurement Technology NW
LCI-90 Operator Manual
Page 43
values less than the Lower Limit (item 6, shown as 0.050 V) or greater than the
Upper Limit (item 7, shown as 4.950 V) will automatically switch from the normal
RUN
screen to the
DIAG
screen, with the offending channel(s) displayed in reverse
video. At the same time the alarm attached to OP1 (TB3-1) will be turned on. (It can
be turned off in the usual way by pressing the
ALRM
button.)
Input checking allows faulty load cells in a multiple-cell configuration to be instantly
identified – something that is not possible with summing boxes. This feature also
provides an independent check for over-range conditions, even when an appropriate
TENSION alarm has
not
been set up. This double-level of monitoring, if properly
configured, can provide enhanced operator safety.
6.4
Analog Output Channels
The analog output hardware is configured through the
4.2 ANALOG OUTPUT CONFIG
menu, shown below. The purpose of the analog output channels is to create a signal that
mirrors one of the line variables over a user determined range. A description of each item
in this menu is given below:
4.2 ANALOG OUTPUT CONFIG
>
1
CHANNEL NO.
1
2
OUTPUT RANGE
0 – 5 V
3
INPUT VAR.
TENSION
4
FULL SCALE
6000 LBS
5
OFFSET
3000 LBS
Item 1 Selects the channel number, 1-2, that the configuration applies to. These channels
correspond specific terminal blocks on the back of the LCI-90 as shown below:
Channel
No Module Used
Module Used
AO – 1
TB2 V0/G (voltage out)
TB2
I
0/G (4-20 mA out)
TB6 – MOD3: S+ / S–
AO – 2
TB2 V1/G (voltage out)
TB2
I
1/G (4-20 mA out)
TB6 – MOD4: S+ / S–
Figure 6.2 – Analog Output Module Locations and Menu Names
Item 2 Selects the analog range for the channel in Item 1. The choices are 4-20 mA, 0-5
V, 0-10V and in a special case
5V. The appropriate range is determined by the
output module installed and the menu should be set to match the installed module
range.
Item 3 Assigns the analog output to a given line variable. The choices are
NONE
,
TEN-
SION
,
SPEED
or
PAYOUT
. If
NONE
is selected, items 4 and 5 are disabled.
Item 4 Sets the analog output full scale value (see Section 6.4.1).