Meyer Sound MPS-488HP, Operating Instructions Manual, Page: 11 / 36

MPS-488HP OPERATING INSTRUCTIONS
11
MPS-488HP CURRENT DRAW
The current draw for the MPS-488HP and its connected
loudspeakers is dynamic and fluctuates as 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. This current rating is also used as a rat-
ing for slow-reacting thermal breakers, which are recom-
mended 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.
For current draw values for the MPS-488HP with connected
loudspeakers, see Appendix C, “MPS-488HP Specifica-
tions.”
The minimum electrical service amperage required by an
MPS-488HP is the sum of the maximum long-term continuous
current for all loudspeakers connected to the MPS-488HP. An
additional 30 percent above the minimum amperage is rec-
ommended to prevent peak voltage drops at the service entry.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 V, or
10 percent at 115 V and 5 percent at 230 V. Make
sure that even with AC voltage drops that the AC
voltage always remains within the operating window.
ELECTRICAL SAFETY GUIDELINES
Pay close attention to these important electrical and safety
guidelines.
■ This Meyer Sound product 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.
■ The AC power connector must not be engaged or disen-
gaged when under load or live.
■ Disconnect the mains plug before disconnecting the
powerCON plug from the unit.
■ Keep all liquids away from the unit to avoid hazards from
electrical shock.
■ Do not operate the unit if the power cable is frayed or
broken.
Earth Ground
Chassis Ground