Measurement Technology NW
LCI-90 Operator Manual
Page 13
4.1
Wiring Hookup – Local Display
This section provides wiring diagrams and related specifications for power and signal input
and output connections for the LCI-90.
4.1.1 Display power and fuse
The fuse, F1, is located on the rear panel of the display. Use a flat blade screwdriver
to open the cover for access. The replacement part is a 5 x 20 mm fuse rated accord-
ing to the system options. See the table below for fuse sizing.
Model No
Fuse Rating
Littlefuse Part No
LCI-90-DC
1/2 A
218.500
Figure 4.2 – Fuse rating and replacement part – Local display
During installation, an appropriate disconnect device must be installed to provide a means
of disconnecting the display from the external power source for servicing. This disconnect
device is not provided with this equipment.
Input power requirements are 18-36VDC (nominal 24VDC) at 15 Watts. This device is a
DC device. This device is approved for Overvoltage Installation Category III.
The LCI-90 requires an 18-36 Volt DC power source. The connection for the power is
shown below.
TB5
Power: 18-36 VDC, 0.5 A
+24
DC +
GND
DC –
Figure 4.3 – Local Display Power Hookup – DC Power
4.1.2 Tension Sensor Inputs
The Tension sensor analog inputs are terminated on TB1 for direct input and TB6 for
signal conditioning modules. The optional analog input modules (Appendix D) sup-
ply isolation and a variety of signal conditioning options. TB1 can accept 4-20 mA
inputs as well as 0-5 VDC voltage inputs. The LCI-90 can accept four analog inputs,
allowing the output from multiple tension sensors to be summed. Each different input
type requires a specific DIP switch setting (see Appendix B).
A push-on jumper is located next to TB1. When direct (non-isolated) inputs are used
the signal common is tied to the DC power ground through jumper H1.
The factory
configuration is with H1 removed; in this case the signal common and DC power
common are not connected.
Tension sensors can be externally powered or powered from the same 24VDC used
by the display. When the display power is used for sensor excitation, Jumper H1