Satellite Radio User Manual

March 2013
8
Quick Installation Guide
Step 3: Connect the wiring
Wiring and power supply requirements can be dependent upon the approval
certification. As with all F
OUNDATION fieldbus requirements, a conditioned power
supply and terminating resistors are required for proper operation.
It is recommended that shielded twisted pair wiring (18-12 AWG) suitable for the
supply voltage be used and, if applicable, approved for use in hazardous areas.
For electrical information, such as power supply, see diagrams and drawings for
HART, Modbus, and F
OUNDATION fieldbus on the following pages.
NOTE:
Avoid running instrument cable next to power cables in cable trays or near heavy electrical
equipment.
It is important that the instrument cable shield be:
- trimmed close and insulated from touching the transmitter housing
- continuously connected throughout the segment
- connected to a good earth ground at the power supply end
Grounding
When wiring the transmitters, the grounding should be completed such that:
 The loop is grounded at the power supply.
 When transmitters are installed on metal tanks, ensure there is a
metal-to-metal connection between the device and the tank.
 If the tank is non-metallic, the housing must be grounded to an earth ground
that is separate from the power supply. The external ground terminal may be
used for this purpose.
 If the tank is cathodically protected, the housing must be grounded to an
earth ground that is outside of the cathodic protection system ground. Use
the external terminal for this purpose.
When transient protection terminal block is used, the ground wire should be
separate from the signal wire. Use the external ground terminal.
Make sure grounding is done (including IS ground inside Terminal compartment)
according to Hazardous Locations Certifications, national and local electrical
codes.
The most effective transmitter housing grounding method is a direct connection
to earth ground with minimal (< 1 ) impedance.
NOTE:
Grounding the transmitter housing using the threaded conduit connection may not provide
a sufficient ground. The transient protection terminal block will not provide transient
protection unless the transmitter housing is properly grounded. Use the above guidelines to
ground the transmitter housing. Do not run transient protection ground wire with signal
wiring; the ground wire may carry excessive current if a lightning strike occurs.