750-LFC OPERATING INSTRUCTIONS
11
WIRING AC POWER CABLES
The pins on the gray powerCON 20 cable mount connector
are labeled as follows:
■ L (Line)
■ N (Neutral)
■ PE (Protective Earth or Ground)
How AC power cables are wired is determined by the type of
AC power distribution system used (see “AC Power Distri-
bution” on page 9). When wiring AC power cables for single-
line systems, use one of the following wiring schemes:
CAUTION: When wiring AC power cables and
distribution systems, it is important to preserve
AC line polarity and connect the earth ground on both
ends of the cable. The 750-LFC requires a grounded
connection. Always use a grounded outlet and plug.
It is extremely important that the system be properly
grounded to operate safely and properly. Do not
ground-lift the AC cable.
750-LFC VOLTAGE REQUIREMENTS
The 750-LFC operates as intended when receiving AC volt-
age within the following range:
■ 90–264 V AC, 50–60 Hz
If the voltage drops below 90 V, the loudspeaker uses stored
power to continue operating temporarily; the loudspeaker
powers off if the voltage does not return to its operating
range.
If the voltage rises above 275 V, the power supply could
become damaged.
CAUTION: The power source for the 750-LFC
should always operate within the required oper-
ating range, at least a few volts from the upper and
lower ranges. This ensures that AC voltage variations
from the service entry — or peak voltage drops due to
cable runs — will not cause the loudspeaker’s ampli-
fier to cycle on and off or cause damage to the power
supply.
750-LFC CURRENT REQUIREMENTS
Current draw for loudspeakers is dynamic and fluctuates as
operating levels change. Since different cables and circuit
breakers heat up at varying rates, it is important to under-
stand the following types of current ratings and how they
affect circuit breaker and cable specifications.
■ Idle Current — The maximum rms current during idle
periods.
■ Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least
10 seconds. The maximum long-term continuous current
is used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rat-
ing for slow-reacting thermal breakers, which are recom-
mended for loudspeaker power distribution. In addition,
the maximum long-term continuous current can be used
to calculate the AC looping capability for 750-LFC loud-
speakers.
■ Burst Current — The maximum rms current during a
period of around 1 second. The burst current is used as
a rating for magnetic breakers. It is also used for calcu-
lating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
■ Maximum Instantaneous Peak Current — A rating for
fast-reacting magnetic breakers.
Gray powerCON 20 Cable Mount Connector
AC Wiring Scheme
Wire Color
Attach to
Terminal
U.S. / Canada
60 Hz
European
50 Hz
Black Brown Hot or live (L)
White Blue Neutral (N)
Green Green and Yellow
Protective earth /
ground (E or PE)
U.S./Canada, 60 Hz
Black (L)
Europe, 50 Hz
Green (E)
White (N)
Brown (L)
Blue (N)
Green/
yellow (E)
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