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EN- Raychem920series-IM-H5687405/15
INDUSTRIAL HEAT TRACING SOLUTIONS
Communications wiring should use twisted conductor, shielded cable. Shields on communications
wiring should be grounded at one end only, using the terminals provided.
The following tables define the appropriate signal connections for the various types of interfaces:
RS-485 (2-Wire) Connections
Communication Signal Terminal No.
Receive/transmit data (+) 6
Receive/transmit data (-) 22
Shield 8
Shield 24
RS-232 Connections
Communication Signal Terminal No.
Receive data 6
Data carrier detect 7
Clear to send 8
Transmit data 22
Request to send 23
Common 24
Modem Interface Connections
(Note that these particular signals are not polarity sensitive)
Communication Signal Terminal No.
Modem 6
Modem 22
Shield 8
Shield 24
2.7.5 POWER CONNECTIONS
All of the power terminals are numbered for easy identification. Do not attempt to use wire sizes
that exceed the marked terminal ratings and avoid terminating two wires on the same terminal
whenever possible.
Always be sure that all terminals are adequately tightened according to the terminal anufacturer’s
specification. See Appendix A on page 61 for allowable wire sizes, recommended insulation strip
lengths, and tightening torque. A loose terminal can cause arcing and damage to the terminal or
incorrect operation of the controller.
IMPORTANT: Make sure that power terminals are re-tightened several days after installation.
Strandedwirewilltendtocompresswheninitiallyinstalled;therefore,theseterminalsshouldbe
checked for tightness several times after the system is installed to ensure that a good con-nection
is maintained. Be certain to use the proper size screwdriver for the terminal blocks to minimize
the chance of damage to the termi-nals.
If the controllers are installed in either a metallic or non-metallic enclosure, follow the enclosure
manufacturer’s recommendations for proper grounding. Do not rely on conduit connections to
provide a suitable ground.
Grounding terminals/screws are provided for connection of system ground leads. Proper system
grounding is required for safe and correct operation of the controller’s protection features.
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