Spectrum Controls 1746sc-CTR4 - Manual (Page 15)

Chapter 2: Installing And Wiring Your Module
15
2. Slide your module into the chassis until both top and bottom retaining
clips are secure. Apply firm even pressure on your module to attach it
to its backplane connector. Never force your module into the slot.
Cover all unused slots with the Card Slot Filler, Allen-Bradley part
number 1746-N2.
To remove your module, press the retaining clips at the top and bottom
of your module and slide it out.
Wiring Your Module
To wire the terminal block, you need:
• a small, flat-blade screwdriver
• Belden 8761 (shielded, twisted pair) cable or equivalent
CAUTION
POSSIBLE EQUIPMENT OPERATION
Before wiring your module, always disconnect power from the
SLC 500 system and from any other source to the module.
Failure to observe this precaution can cause unintended
equipment operation and damage.
Before wiring the terminal block, take some time to plan your system:
• Ensure that the SLC 500 system is installed in a NEMA-rated enclosure
and that the SLC 500 system is properly grounded.
• Route the field wiring away from any other wiring and as far as possible
from sources of electrical noise, such as motors, transformers,
contactors, and ac devices. As a general rule, allow at lease 6 in.
(about 15.2 cm) of separation for every 120 Vac of power.
• Routing the field wiring in grounded conduit can reduce electrical
noise further.
• If the field wiring must cross ac or power cables, ensure that they
cross at right angles.
To wire your module, follow these steps:
1. Determine the length of cable you need to connect a channel to its field
device. Remember to include additional cable to route the drain wire and
!