SETUP:
The LI20 may be powered by either of two methods:
directly from the 4-20 mA loop or by a separate DC
supply of between 5 and 25 VDC at 6 mA. Transformer
isolation between signal and power inputs is 500V in the
DC supply mode. Refer to diagrams at right for
connections.
Decimal point or extra zero is activated by a pin array
labeled Z 1 2 3 at the back of the instrument. Place the
jumper over the "Z" pins to illuminate the extra zero, the
"1" pins to illuminate a decimal point in the XXX.X
position etc.
Input signal selection is made by a pin array labeled A B
C at the back of the instrument. For a 4-20 mA control
current input place jumpers over pins A B C. For 1-5 V
input, remove all the jumpers, (to avoid losing the
jumpers, place each jumper over 1 pin of pins A B C.)
CALIBRATION:
The LI20 may be calibrated in its case. The HI and LO
controls are behind the faceplate with the HI control on
the left and the LO control on the right. Remove the
faceplate by inserting a stiff wire in the groove at the
bottom edge of the bezel and prying off the faceplate.
These controls are labeled on the PCB.
Apply 4 mA (1V) to the input and adjust the LO control
for the desired reading. Then apply a signal between 16
and 20 mA (4 and 5V) and adjust the HI control for the
desired reading. Complete the calibration by making any
minor adjustments to the LO and HI displays.
LI20
A. Balanced control; (Factory adjusted only)
B. HI calibration control
C. LO calibration control
D. Decimal point & extra zero pin array
E. Input selection pin array
F.
Removable screw terminal block (supplied)
Circuit connection for LI20 monitoring loop current by measuring
voltage across the controller input. LI20 powered by the system
power supply. Power supply circuit (terminals P+ and P-)
completely isolated from signal circuit (terminals S+ and S-).
Here the LI20 adds no voltage drop to the loop.
Circuit connections for LI20 monitoring current loop and
delivering its power from that loop.
NOTES:
A. Panel cutout required - 1.772” x 3.622” (45mm x 92mm)
1/8 DIM
B. Panel thickness - .060” -.250” (1.52mm - 6.34mm)
C. Allow 6 inches (152mm) behind panel
D. Weight: 12 oz. (340 g)
Model LI20
APPLICATION INFORMATION
Power
Supply
Transmitter
Controller
Recorder
P+
P -
S+
S -
A B C
LI20
+
+
+
+
-
-
-
-
Power
Supply
Transmitter
P+
P -
S+
S -
A B C
LI20
P+
P -
S+
S -
A B C
LI20
+
+
-
-
-
-
Transmitter
+
+
+
-
Controller
Controller
1 V Drop
Max
1 V Drop
Max
6" (152mm)
SIDE VIEW
FRONT VIEW
Mounting Dimensions
3.82" (97mm)
4.30" (109mm) Installed
4.83" (123mm) Req'd for Inst.
1.88"
(48mm)
A
B
C
F
E
D
Содержание LI20
Страница 3: ...LI20 APPLICATION INFORMATION...
