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AC Power
The AC voltage operating ranges for the PSM-2 are
85–134 V and 165–264 V, at 50 or 60 Hz. The PSM-2
performs surge suppression for high voltage transients
and can safely withstand voltages up to 275 VAC.
Continuous voltages above 275 VAC may
damage the unit!
When an AC source is applied to the PSM-2, the
Intelligent AC power supply
• auto-selects the voltage;
• performs surge suppression and minimizes
inrush current;
• filters EMI.
After three seconds, the main power supply is slowly
ramped on. The PSM-2 uses a NEMA L6-20P or IEC 309
male power inlet and satisfies UL, CSA, and EC safety
standards.
Use the following AC cable wiring diagram to create
international or special-purpose power connectors:
brown = hot
blue =
neutral
yellow/green =
earth ground
(chassis)
AC cable color code
If the colors referred to in the diagram don't correspond
to the terminals in your plug, use the following
guidelines:
• Connect the blue wire to the terminal marked
with an N or colored black.
• Connect the brown wire to the terminal marked
with an L or colored red.
• Connect the green and yellow wire to the
terminal marked with an E (or ) or colored
green (or green and yellow).
Power Requirements
The PSM-2 presents a dynamic load to the AC mains
which causes the amount of current to fluctuate between
quiet and loud operating levels. Since different types
of 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 continuous RMS current is the maximum
RMS current in a period of at least 10 seconds. It is
used to calculate the temperature increase in cables,
which is used to select cables that conform to electrical
code standards. It is also used to select the rating for
slow-reacting thermal breakers.
The maximum burst RMS current is the maximum
RMS current in a period of approximately 1 second. It
is used to select the rating for most magnetic breakers.
The maximum peak current during burst is used to
select the rating for fast-reacting magnetic breakers
and to calculate the peak voltage drop in long AC
cables according to the formula
Vpk
drop
= Ipk x Total Cable Resistance
Use the table below as a guide to select cables and
circuit breakers with appropriate ratings for your
operating voltage.
sgnitaRtnerruC2-MSP
V511 V032 V001
SMRsuounitnoC.xaM
A8
SMR
A4
SMR
A01
SMR
SMRtsruB.xaM
A51
SMR
A8
SMR
A81
SMR
tsruBgniruDkaeP.xaM
A22
KAEP
A11
KAEP
A52
KAEP
The minimum electrical service amperage required by a
system of PSM-2s is the sum of the maximum continuous
RMS current for each speaker. We recommend allowing
an additional 30% above the minimum amperage to
prevent peak voltage drops at the service entry.