Rockwell Automation 1748 DataSite Configured Panel Installation Instructions - Manual (Page 41)

Publication 1748-IN001B-EN-P - May 2009
Troubleshooting 41
b. If 12V DC is not present at the DC-DC converter, check the
following:
– Check to see that the fuse 3FU has not opened.
– If the fuse has opened, inspect the wiring for cuts or frays and
replace if necessary. Contact Rockwell Technical Support for more
details.
3. Check all cables and wires associated with the HMI.
a. The HMI communicates with the DataSite controller via a serial
communication RS232 cable. If this cable is frayed or kinked, the
communication may be halted. Inspect the cable for any damage and
replace if necessary.
b. The HMI requires 24V DC. If the device receives less than 20V DC,
it may not power up. Check the voltage at the HMI inputs and
replace the power wiring if necessary.
Common Problems Two common problems with outdoor panel applications are improper end
connections for antennas, and moisture penetration.
Improper End Connections for Antennas
When installing a radio communication device in the DataSite configured
panel, it is suggested to use precut manufactured antenna cables. A majority of
the signal loss in a cable is often attributed to the improper crimping and
soldering of the antenna end connectors. It is suggested that when installing
antenna cables that a manufactured cable be used to eliminate the effects of
improper installation of the end connectors. Additional cable may be coiled up
when not used without concerning the loss of signal strength.
IMPORTANT
When an antenna cable longer than 30.5 m (100 ft) is used, the
signal loss may be large due to the impedance of the antenna
cable. It is not suggested to coil wire up in excess of 30.5 m
(100 ft) as this could cause a loss of signal. In applications
where long distances of cable are required, it is suggested that
a trained technician should install the antenna cable.