Crestron CT-3000 Specifications download pdf (Page 9)

Crestron CNECI-4A Electrical Control Interface with AC

should be used in the following resistance equation to calculate the value on the right

side of the equation.

Resistance Equation

R = Resistance (refer to table below)

L = Length of run (or chain) in feet

PF = Power factor of entire run (or chain)

R <

L x PF

40,000

Where:

The required wire gauge should be chosen such that the resistance value is less than

the value calculated in the resistance equation. Refer to the table below:

Wire Gauge Values

RESISTANCE (R) WIRE GAUGE

Doubled CAT5

8.7

Tripled CAT5

NOTE: All network wiring must consist of two twisted-pairs. One twisted pair is

the +24V conductor and the ground (G) conductor and the other twisted pair is the Y

conductor and the Z conductor.

NOTE: When daisy chaining network units, always twist the ends of the incoming

wire and outgoing wire which share a pin on the network connector. After twisting

the ends, tin the twisted connection with solder. Apply solder only to the ends of the

twisted wires. Avoid tinning too far up or the tinned end becomes brittle and breaks.

After tinning the twisted ends, insert the tinned connection into the network

connector and tighten the retaining screw. Repeat the procedure for the other three

network conductors.

Hookup

WARNING: Use extra caution when working with 100-125VAC or 220-250VAC.

These voltages present an extreme hazard if inadvertent contact is made. Isolate and

turn-off all applicable electrical circuits before routing wiring.

WARNING: Disconnect power before working on this unit. While power is

connected, there are live components inside.

WARNING: Relay terminals 1, 2, 3, and 4 may still contain voltage even after AC

power is disconnected.

CAUTION: When connecting 100-125VAC or 220-250VAC to the AC power

terminal block, terminal G must be ground, N is neutral, and the L terminals (either

or both terminals, they are electrically connected) are for line voltage.

NOTE: Instead of installing discrete AC wiring for each relay, the AC line voltage

may be daisy-chained from the L terminal of the AC power terminal block to the

relay COM terminals.

Operations Guide - DOC. 8149 Electrical Control Interface with AC: CNECI-4A • 5

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Crestron CT-3000 Specifications Page 9

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