Power Connections - Pentair 920 Series Installation, Operating And Maintenance Instructions

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
Receive/transmit data (+)
Receive/transmit data (-)
Shield
Shield
rs-232 Connections
Communication signal
Receive data
Data carrier detect
Clear to send
Transmit data
Request to send
Common
modem Interface Connections
(note that these particular signals are not polarity sensitive)
Communication signal
Modem
Modem
Shield
Shield

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.
Stranded wire will tend to compress when initially installed; therefore, these terminals should be
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.
EN- Raychem920series-IM-H56874 05/15
terminal no.
6
22
8
24
terminal no.
6
7
8
22
23
24
terminal no.
6
22
8
24
15 / 82