Meyer Sound 1100-LFC Operations Instructions download pdf (Page 12)

CHAPTER 2: POWER REQUIREMENTS

1100-LFC VOLTAGE REQUIREMENTS

CAUTION: Due to its expanded power capabil-

ities, the 1100-LFC was engineered to operate

only at 220 V AC (208–235 V AC) to reduce current

draw. Make sure to use AC power cables with suffi-

cient gauge to operate with stable voltages during

peaks and that the AC power source is capable of

providing enough power.

The 1100-LFC operates safely and continuously when its AC

voltage stays within 208–235 V AC at 50 or 60 Hz. The loud-

speaker allows any combination of voltage to ground (neu-

tral-line-ground or line-line-ground).

If the voltage drops below 208 V (brownout), the 1100-LFC

uses stored power to continue operating temporarily; the

loudspeaker shuts down if the voltage does not rise above

the low boundary before the stored power is used.

If the voltage rises above 275 V, the power supply could

become damaged.

CAUTION: To ensure that the 1100-LFC per-

forms as specified, without interruption, and

without damage to its power supply:

1. Its power source must operate within the required

voltage window (208–235 V AC).

2. Its AC cable length and gauge must be such that

peak voltage drops do not exceed 5 percent of its

voltage.

AC POWER DISTRIBUTION

All components in an audio system (self-powered loud-

speakers, mixing consoles, and processors) must be prop-

erly connected to an AC power distribution system, ensuring

that AC line polarity is preserved and that all grounding

points are connected to a single node or common point

using the same cable gauge as the neutral and line cables.

NOTE: Improper grounding of connections

between loudspeakers and the rest of the

audio system may produce noise or hum, or cause

serious damage to the input and output stages of the

system’s electronic components.

CAUTION: Before applying AC power to any

Meyer Sound self-powered loudspeaker, make

sure that the voltage potential difference between the

neutral and earth ground lines is less than 5 V AC.

Figure 1 illustrates a basic 220 V AC, 3-phase Wye distribu-

tion system with the loudspeaker load distributed across all

three phases, with each loudspeaker connected to a single

line and common neutral and earth ground lines. This sys-

tem delivers 220 V AC to each loudspeaker.

Because the 1100-LFC can tolerate elevated voltages from

the ground line, and does not required a neutral line, it can

also receive voltage from two of the three phases in a Wye

system. Figure 2 illustrates a 120 V AC, 3-phase Wye distri-

bution system with each loudspeaker connected to two

lines and a common earth ground line. This system delivers

208 V AC to each loudspeaker.

CAUTION: Make sure the voltage received by

the 1100-LFC remains within the loudspeaker’s

208–235 V AC operating window. In addition, the

ground line must always be used for safety reasons

and the line-to-ground voltage should never exceed

250 V AC (typically 120 V AC from line to ground).

Figure 1: 220 V AC, 3-Phase Wye System (Single Line to Loudspeakers)

Figure 2: 120 V AC, 3-Phase Wye System (Two Lines to Loudspeakers)

Loudspeaker Loudspeaker Loudspeaker

Neutral

Earth/Grnd

Line 1 (220 V AC)

Line 3 (220 V AC)

Line 2 (220 V AC)

(220 V AC) (220 V AC)(220 V AC)

Loudspeaker Loudspeaker Loudspeaker

Neutral

Earth/Grnd

(208 V AC) (208 V AC)(208 V AC)

Line 1 (120 V AC)

Line 3 (120 V AC)

Line 2 (120 V AC)

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Meyer Sound 1100-LFC Operations Instructions Page 12

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