Meyer Sound 750-LFC, Operating Instructions Manual

Page: 15 / 52

CHAPTER 2: POWER REQUIREMENTS
15
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
Distribution” on page 13). 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 loudspeaker 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 loudspeaker operates as intended when
receiving AC voltage 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
loudspeaker should always operate within the
required operating 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
amplifier 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. Because different cables and circuit
breakers heat up at varying rates, it is important to understand
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 the size and gauge of the cables conform to
electrical code standards. The current rating is also used
as a rating for slow-reacting thermal breakers, which are
recommended for loudspeaker power distribution. In
addition, the maximum long-term continuous current can
be used to calculate the AC looping capability for 750
-
LFC
loudspeakers.
•
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 calculating
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)
L
N
PE
SIDE FRONT REAR
U.S./Canada, 60 Hz
Black ( L )
Europe, 50 Hz
Green ( E )
White ( N )
Brown ( L )
Blue ( N )
Green/
yellow ( E )
!
!