aR-20 II Voltage RegulatoR / poweR condItIoneR
ogy. Additionally, Furman’s trusted over-volt
-
age circuitry protects against all too frequent
accidental connections to 208 or 240 VAC, by
shutting off the incoming power until the over
voltage condition is corrected.
liFt (linear Filtering technology)
Unfortunately, traditional AC filter - conditioners
have been designed for unrealistic laboratory
conditions. prior technologies could actu-
ally harm audio and video performance more
than they help, due to the resonant peaking
of their antiquated, non-linear designs. Under
certain conditions, these designs can actually
add more than 10 dB of noise to the incoming
AC line! Furman’s SMP+ with LiFT takes an
-
other approach, ensuring optimal performance
through linear filtering and no leakage to
ground. With this exclusive filtration technol
-
ogy, all connected equipment will be free of
noise and contamination and will operate at
optimum performance levels.
extreme Voltage shutdown Indicator
this Led is normally off. it monitors a hazard
common in the entertainment industry: wiring
faults – for example, accidental connection
to 220VAC where 120VAC is expected, or an
open neutral from a 208 or 240VAC feed. the
Series II SMP+ circuit senses voltages that
are so high that operation would be impossible
and shuts the power down before damage
can occur. Upon initially applying power to
these units, the Extreme Voltage indicator
LED will light if the input voltage is above the
extreme voltage cutoff, and power will not be
applied to the unit’s outlets. If the unit has been
operating with an acceptable input voltage
and subsequently that voltage exceeds 145-
150V, it will shut off power to the outlet and the
Extreme Voltage LED will light.
NOTE: If the mains power is above the high
cutoff voltage and has caused the unit to
remove power from its outlets, it cannot restore
power without the operator manually turning
the unit off, then on again. Avoid turning the
unit back on, without first checking the source
of the problem, and perhaps changing the AC
source.
protection oK Indicator
Although the Furman SMP+ circuit assures
virtually protection from transient voltage
spikes and surges, nature has a way of
occasionally creating electrical forces that are
beyond the capabilities of
any
tVss device to
absorb without some degree of damage. In
the rare instance that this occurs, the green
“Protection OK” LED indicator located on your
front panel will dim. If this happens some level
of protection from voltage surges will remain,
but the Furman’s clamping voltage rating will
be compromised. the unit must be returned
to Furman Sound, or an authorized Furman
service center for repair.
Fuses and cIRcuIt BReaKeRs
there is one fuse and one circuit breaker in the
AR-series. in the event that the unit appears to
be completely dead (neither the Power switch
nor any LED’s light up), unplug the power cord
and the load and check the breaker. if the cir-
cuit breaker is tripped, a white button will pop
up. push it back in to reset it. the purposes of
these circuit protection devices are:
1. A fast-blow 20 amp circuit breaker is acces
-
sible at the rear panel without removing the
unit from the rack. This breaker will trip if the
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