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Powering the XEV22D Mounting and Powering • 5

5.2.2. XEV22D Power Wiring

The XEV22D can be powered by one of the 50VA

non-center-tapped transformers listed in Table 5-2.

Neither side of the secondary should be connected

to ground. Also, do not connect the center tap (if pro-

vided on the transformer) to ground. The entire sec-

ondary of the transformer should be isolated from any

ground.

5.2.3. Wire Type and Maximum

Distances

Two-conductor non-shielded cables are the rec-

ommended wire for connecting the transformer to the

XEV22D, see Table 5-3 for power wiring types.

Shielded cable should not be used for power wiring.

The center tap should be left disconnected, if present

on the transformer.

The wire length from the transformer determines

the type wire gauge used. In most cases, the distance

between the XEV22D and the transformer that sup-

plies power to it is not enough to be of concern;

how-

ever, it is very important NOT to exceed this

maximum wire length or the controller will not oper-

ate correctly.

Use these formulas to determine if the wire gauge

you are using fits within specification:

Sensors requiring 24VAC should not be powered

from the same transformer powering the input board.

Any devices that will be connected to the XEV22D’s

inputs or outputs must be powered with a separate

24VAC transformer.

Transformer

Part Number

VA Rating

Primary

Voltage

640-0040 50VA 110/208/220 VAC

640-0041 50VA 110 VAC

640-0042 50VA 220 VAC

Table 5-2- Transformer Compatible with XEV22D

Power Wiring Types

14 AWG Belden 9495

18 AWG Belden 9495

Table 5-3- Power Wiring Types

14AWG:

Feet = 1920/VA

18AWG:

Feet = 739/VA

(VA is the total VA rating of the controller)

For example, if you had an 18 VA load:

14 AWG: 24 ft.

18 AWG: 9ft. (rounded down)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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Emerson XEV22D Especificaciones Pagina 11

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