Table of Contents
Advertisement
CHAPTER 2: POWER REQUIREMENTS
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
to select appropriately rated, slow-reacting thermal
breakers, which are recommended for loudspeaker
power distribution.
• 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.
• Inrush Current — The spike of initial current encoun-
tered when powering on.
Use the information provided in Table 2 as a guide for
selecting the gauge of cables and the circuit breaker ratings
for the system's operating voltage.
Table 2: 1100-LFC Current Draw
Current Draw
230 V AC
Idle
0.6 A rms
Maximum Long-
10.5 A rms
Term Continuous
Burst
18 A rms
Maximum Instanta-
53 A peak
neous Peak
Inrush
<30 A peak
The minimum electrical service amperage required by a
loudspeaker system is the sum of the maximum long-term
continuous current for all loudspeakers. An additional
30 percent above the combined Maximum Long-Term
Continuous amperages is recommended to prevent peak
voltage drops at the service entry.
NOTE:
For best performance, the AC cable volt-
age drop should not exceed 10 V (5 percent at
230 V). This ensures that the AC voltage variations
from the service entry—or peak voltage drops due to
longer cable runs—do not cause the amplifier to cycle
on and off.
14
DO NOT RESET CIRCUIT BREAKERS!
CAUTION:
In the unlikely event that one of the
1100-LFC's circuit breakers trips (the center
button disengages), disconnect the AC power cable
and contact Meyer Sound for repair information. DO
NOT attempt to reset the breaker or reconnect the
AC power cable.
INTELLIGENT AC POWER SUPPLY
The 1100-LFC's Intelligent AC™ power supply eliminates
high inrush currents with soft-start power up, suppresses
high-voltage transients up to several kilovolts, filters
common mode and differential mode radio frequencies
(EMI), and sustains operation temporarily during low-voltage
periods.
Powering on the 1100-LFC
When powering on the 1100-LFC, the following startup
events take place over several seconds.
1. Audio output is muted.
2. The primary fan turns on.
3. The power supply ramps up.
4. On the user panel, the Active LED turns solid green,
indicating the loudspeaker is unmuted and ready to
output audio.
CAUTION:
If the Active LED does not turn solid
green, or the 1100-LFC does not output audio
after 10 seconds, remove AC power immediately and
verify that the voltage is within the required range. If
the problem persists, contact Meyer Sound Technical
Support.
ELECTRICAL SAFETY GUIDELINES
Make sure to observe the following important electrical and
safety guidelines.
• The powerCON 32 connector should not be engaged or
disengaged when under load or energized. Either de-
energize or disconnect the other end of the cable.
• The 1100-LFC requires a grounded outlet. Always use a
grounded outlet and plug.
• Do not use a ground-lifting adapter or cut the AC cable
ground pin.
Advertisement
Table of Contents
