P S - P R O H T - P O W E R CO N D I T I O N E R / S E Q U E N C E R
tions, if the voltage falls below 80 volts or rises
above 140 volts. This feature is called “Extreme
Voltage Shutdown.” See pages 5-6 for more
information on the various protection features’
indicator lights.
Despite its many protective features, you
should
be aware that the PS-PRO HT does not compensate
if the AC line voltage itself is high or low (i.e., it
does not compensate for brownout conditions). If
you are in an area particularly prone to brownouts,
you may benefit from the use of one of Furman’s
Reference AC Line Voltage Regulators in addition
to the PS-PRO HT. If you do use a voltage regula-
tor, run the raw power line into the regulator first
so that the PS-PRO HT receives a stabilized voltage
to distribute.
ON OR OFF SEQUENCING
The method of initiating an ON or OFF sequence
depends on whether the unit is to be controlled
locally or remotely. If remotely, it further depends
on the type of switch or switches used (momentary
or maintained).
Local Control: For local control, an ON sequence
is initiated by turning the key switch to the ON
position, and an OFF sequence by turning the key
switch to REM or OFF position.
Remote Control: When the PS-PRO HT’s front
panel key lock switch is in the REM position, it
may be controlled by one or more switches in
remote locations. In the most basic configuration,
only two wires and an SPST switch are needed to
initiate an ON or OFF sequence. The switch may be
either a momentary or a maintained-contact type,
depending on a jumper setting inside the PS-PRO
HT. If an additional wire is used, an LED may also
be installed at the remote end to indicate that the
power is on.
Momentary vs. Maintained Contact
Switching
An on-off switch of either kind may be used to
actuate the PS-PRO HT’s remote operation.
Maintained switches, such as most toggle
the front panel) in to reset it.
Although 20 amps is an absolute limit, the
PS-PRO HT will allow you to come as close
as possible to using the full 20 amps, because
with power sequencing, the risk of tripping the
breaker is greatly reduced. This is because the
PS-PRO HT handles large but temporary inrush
currents in stages, rather than simultaneously,
allowing each stage to settle to its steady-state
current draw before the next stage is powered.
Outlets and Plugs:
The PS-PRO HT’s four
rear panel outlet pairs are standard 120V, 20A
duplex types. These outlets are widely spaced,
to accommodate one bulky plug-mounted “wall
wart” power supply in each without covering up
an adjacent outlet. The front panel outlet is lim-
ited to 15 amp use. The PS-PRO HT also uses
a 20 amp line cord, which can be recognized by
the perpendicular blades on the plug. In 20 amp
products, use of a plug of this type is required for
UL safety certification. It is compatible with 20
amp outlets (such as the ones on the PS-PRO
HT’s rear panel.)
POWER CONDITIONING FEATURES
The PS-PRO HT provides a very high degree of
power conditioning protection for your expensive
and delicate equipment. What sets Furman’s
PRO-level protection apart from that offered by
other conditioners is the quantity, quality, and
configuration of its suppression devices. These
include MOV’s, gas discharge tubes, fast-blow
fuses, and high voltage capacitors. This unique
combination can safely absorb and dissipate
large spikes from nearby lightning strikes and
other sources (up to 13,000 amps), as well as
highly attenuate audible high frequency noise.
Clean, filtered power is provided at all 9 outlets,
even the unswitched ones.
The PS-PRO HT will even keep itself from turn-
ing on, or will shut down under extreme condi-
3
NOTE: If the PS-PRO HT is to be used under local
control only, and a jumper is installed on JMP1,
and no switch is connected to the PS-PRO HT’s
terminal strip, then a jumper should be connected
between the REM and +12V terminals. Otherwise,
turning the front panel key switch to the REM
