Meyer Sound 600-HP - Manual (Page 12)

6
CHAPTER 2
NOTE: Refer to Appendix B for details on
the 600-HP’s AC voltage requirements.
After applying AC power, the proper operating voltage is
automatically selected, but the system is muted. During the
next three seconds the following events occur:
1. The primary fan turns on.
2. The main power supply slowly ramps on.
3. The green Active LED on the user panel lights up,
indicating that the system is enabled and ready to pass
audio signals.
CAUTION: If the Active LED does not il-
luminate or the system does not respond to
audio input after 10 seconds, remove AC power im-
mediately. Verify that the voltage is within the proper
range. If the problem persists, please contact Meyer
Sound or an authorized service center.
If voltage drops below the lower boundary of either safe
operating range (brownout), the 600-HP subwoofer uses
stored energy to continue functioning briefly, and shuts
down only if voltage does not rise above the lower bound-
ary before the subwoofer’s storage circuits are depleted.
How long the 600-HP subwoofer will continue to function
during brownout depends on the amount of voltage drop
and the audio source level during the drop.
If the voltage increases above the upper boundary of
either range, the power supply rapidly turns off, preventing
damage to the unit.
NOTE: If voltage fluctuates within either oper-
ating range, automatic tap selection stabilizes
the internal operating voltage. This tap selection is
instantaneous, and there are no audible artifacts.
If the 600-HP subwoofer shuts down due to either low or
high voltage, its power supply automatically turns on again
after three seconds if the voltage has returned to either nor-
mal operating range. If the 600-HP subwoofer does not turn
back on after 10 seconds, remove AC power immediately
(see above Caution).
NOTE: It is recommended that the supply be
operated in the rated voltage ranges at least
a few volts away from the turn on/off points. This
ensures that AC voltage variations from the service
entry — or peak voltage drops due to long cable
runs and/or insufficient gauge cable — do not cause
the amplifier to cycle on and off.
CURRENT REQUIREMENTS
The 600-HP subwoofer presents a dynamic load to the AC
mains, which causes the amount of current to fluctuate
between quiet and loud operating levels. Since different
cables and circuit breakers heat up at varying rates, it is
essential to understand the types of current ratings and how
they correspond to circuit breaker and cable specifications.
The maximum long-term continuous current is the maxi-
mum rms current during a period of at least 10 seconds.
It is used to calculate the temperature increase in cables
in order to select a cable size and gauge that conforms to
electrical code standards. It is also used to select the rating
for slow-reacting thermal breakers.
The burst current is the maximum rms current during a
period of approximately one second, used to select the
rating of most magnetic breakers and to calculate the peak
voltage drop in long AC cables according to the formula:
V pk (drop) = I pk x R (cable total)
The ultimate short-term peak current is used to select the
rating of fast-reacting magnetic breakers.
Use Table 2.1 below as a guide when selecting cable gauge
size and circuit breaker ratings for your operating voltage.
Table 2.1. Current Ratings for the 600-HP Subwoofer
Current Draw 115 V AC 230 V AC 100 V AC
Idle current 0.64 A rms 0.32 A rms 0.85 A rms
Max. long-term
continuous 8.8 A rms 4.4 A rms 10 A rms
Burst current 19 A rms 9.5 A rms 22 A rms
Ultimate short-
term peak 39 A pk 20 A pk 45 A pk
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 volts, or
10 percent at 115 volts and 5 percent at 230 volts.
Make sure that even with the AC voltage drop the
AC voltage always stays in the operating windows.
NOTE: The minimum electrical service am-
perage required by the 600-HP subwoofer
system is the sum of each loudspeaker’s maximum
long-term continuous current. An additional 30
percent above the minimum amperage is recom-
mended to prevent peak voltage drops at the
service entry.