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CHAPTER 2: POWER REQUIREMENTS
When wiring international or special-purpose power con-
nectors:
■
Connect the blue wire to the black terminal, or the termi-
nal marked with an N.
Connect the brown wire to the red terminal, or the termi-
■
nal marked with an L.
■
Connect the yellow and green wire to the green (or green
and yellow) terminal, or the terminal marked with an E.
CAUTION:
When creating AC power cables and dis-
tribution systems, it is important to preserve AC line
polarity and connect earth ground on both ends of
the cable. UPJunior loudspeakers require a grounded
connection. Always use a grounded outlet and plug.
It is extremely important that the system be properly
grounded in order to operate safely and properly. Do
not ground-lift the AC cable.
UPJUNIOR VOLTAGE REQUIREMENTS
The UPJunior operates safely and continuously when the
AC voltage stays within 90–264 V AC at 50 or 60 Hz. The
loudspeaker also allows any combination of voltage to GND
(neutral-line-ground or line-line-ground).
If the voltage drops below 90 V (brownout), the UPJunior
uses stored power to continue operating temporarily; the
loudspeaker will shut down if the voltage does not rise
above the low boundary before the stored power is used.
If the voltage rises above 264 V, the UPJunior power supply
can be damaged.
CAUTION:
The UPJunior power source should
!
always operate within its required voltage
range, at least a few volts from the upper and lower
ranges. This will ensure that AC voltage variations
from the service entry — or peak voltage drops due
to cable runs — will not cause the UPJunior's ampli-
fier to cycle on and off or cause damage to the power
supply.
Powering Up the UPJunior
When AC power is applied to the UPJunior, its
Intelligent AC™ power supply automatically selects the cor-
rect operating voltage, allowing it to be used internationally
without manually setting voltage switches. In addition, Intel-
ligent AC also suppresses high-voltage transients up to sev-
eral kilovolts, filters common mode and differential mode
radio frequencies (EMI), and sustains operation temporarily
during low-voltage periods.
10
When powering up the UPJunior, the following startup
events take place over several seconds.
1. Audio output is muted.
2. Voltage is detected and the power supply mode is auto-
matically adjusted as necessary.
3. The fan turns on and the power supply ramps up.
4. The green On/Temp LED on the user panel lights up,
indicating the loudspeaker is ready to output audio.
CAUTION:
If the On/Temp LED does not light
!
up, or the UPJunior does not output audio after
ten seconds, remove AC power immediately and ver-
ify that the voltage is within the required range. If the
problem persists, contact Meyer Sound Technical
Support.
UPJUNIOR CURRENT REQUIREMENTS
The current draw for the UPJunior is dynamic and fluctuates
as its operating levels change. Since 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 sec-
onds. 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. In addition, the
Maximum Long-Term Continuous Current can be used to
calculate the AC looping capability of the UPJunior.
■
Burst Current — The maximum rms current during a
period of around one second. The Burst Current is used
as a rating for magnetic breakers. It is also used for cal-
culating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
Ultimate Short-Term Peak Current — An rms rating for
■
fast-reacting magnetic breakers.
■
Inrush Current — The spike of initial current presented
when powering on.
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