Spectrum Controls 1746sc-INO4vi User Manual

Page 20

SLC 500

™

Isolated Analog Output Modules

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.

• Ensure that the load resistance for a current output channel is less than

500

Ω

• Ensure that the load resistance for a voltage output channel is greater

than 1 k

Ω

• 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 V of power.

• Routing the field wiring in grounded a 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 foil shield to their ground points.

2. At each end of the cable, strip some casing to expose the individual

wires.

3. Trim the exposed signal wires to 2 in. lengths. Strip about 3/16 in.

(about 5 mm) of insulation away to expose the end of each wire.