Wiring Ac Power Cables; Voltage Requirements; Current Requirements - Meyer Sound UPQ-D Series Operating Instructions Manual

WIRING AC POWER CABLES

UPQ-D Series loudspeakers ship with a gray powerCON 20
cable mount connector, rated at 20 A, for assembling AC
looping cables (Figure 7). The pins on the powerCON 20 cable
mount connector are labeled as follows:
L (Line)
•
N (Neutral)
•
PE (Protective Earth or Ground)
•
SIDE
Figure 7: powerCON20Cable Mount Connector
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 wiring schemes shown in
Figure 8 and described in Table 2:
Black (L)
White (N)
Green (E)
U.S./Canada, 60 Hz
Figure 8: AC Wiring Scheme
Table 2: AC Wiring Scheme
Wire Color
U.S. / Canada European
60 Hz 50 Hz
Black Brown
White Blue
Green Green and Yellow
CAUTION: When wiring AC power cables and
!
distribution systems, it is important to preserve
AC line polarity and connect the earth ground at both
ends of the cable. A UPQ-D Series 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.
FRONT REAR
L
N
Brown (L)
Blue (N)
Green/
yellow (E)
Europe, 50 Hz
Attach to the
Following
Terminal
Hot or live (L)
Neutral (N)
Protective earth / ground
(E or PE)

VOLTAGE REQUIREMENTS

A UPQ-D Series 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:
PE
!
loudspeaker should always operate within the
required operating range, at least a few volts from the
upper and lower limits. This approach 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.

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 and to
ensure that the size and gauge of each cable conforms to
electrical code standards. This current rating is also used
to select appropriately rated, 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 UPQ-D Series 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.
UPQ-D SERIES OPERATING INSTRUCTIONS
The power source for a UPQ-D Series
15