Furman Sound PS-PRO User Manual
P S - P R O - P O W E R CO N D I T I O N E R / S E Q U E N C E R
RECOMMENDATIONS
In audio/video installations, we recommend that
power amps receive power last — plug them all into
Delay 3 or divide them into two groups and plug
one group through Delay 2 and the other through
Delay 3. Low level equipment such as mixers and
signal processors should use Delay 1. Equipment
incorporating clocks or timers such as VCR’s, or
equipment that must respond to wireless remote
actuation, should use the unswitched outlets. We
suggest keeping the front panel unswitched outlet
free for equipment that is only in use temporarily.
The overall capacity of the PS-PRO is 20 amps. This
refers to the combined steady-state current drawn
by all devices plugged into all of its nine outlets. If
this combined current level exceeds 20 amps at any
time, the circuit breaker will trip, cutting off power
to your rack. If this occurs, you must reduce the load
by unplugging one or more units from the PS-PRO.
Then push the white button on the circuit breaker
(on the front panel) in to reset it.
Although 20 amps is an absolute limit, the PS-PRO
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 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’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 limited to 15 amp use. The
PS-PRO 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 compat-
ible with 20 amp outlets (such as the ones on the
PS-PRO’s rear panel.) For more information about
power amps receive power last — plug them all into
Delay 3 or divide them into two groups and plug
one group through Delay 2 and the other through
Delay 3. Low level equipment such as mixers and
signal processors should use Delay 1. Equipment
incorporating clocks or timers such as VCR’s, or
equipment that must respond to wireless remote
actuation, should use the unswitched outlets. We
suggest keeping the front panel unswitched outlet
free for equipment that is only in use temporarily.
The overall capacity of the PS-PRO is 20 amps. This
refers to the combined steady-state current drawn
by all devices plugged into all of its nine outlets. If
this combined current level exceeds 20 amps at any
time, the circuit breaker will trip, cutting off power
to your rack. If this occurs, you must reduce the load
by unplugging one or more units from the PS-PRO.
Then push the white button on the circuit breaker
(on the front panel) in to reset it.
Although 20 amps is an absolute limit, the PS-PRO
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 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’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 limited to 15 amp use. The
PS-PRO 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 compat-
ible with 20 amp outlets (such as the ones on the
PS-PRO’s rear panel.) For more information about
20 amp plugs, see the information sheet “What Kind
Of Plug Is This, Anyway?” that accompanied this
manual, or request a copy from Furman.
Of Plug Is This, Anyway?” that accompanied this
manual, or request a copy from Furman.
POWER SEQUENCING
FEATURES
FEATURES
The PS-PRO rear panel provides one unswitched
outlet pair and three switched outlet pairs. The
switched outlet pairs are labeled Delay 1, Delay 2,
and Delay 3. (The other pair of outlets on the rear
panel and an additional single outlet on the front
panel are unswitched.)
Here’s how the PS-PRO works: When an ON se-
quence is initiated, power is immediately applied
to the Delay 1 outlets. Power is then applied to
Delay 2 and Delay 3 outlets per the 1-60 second
total delay setting you choose with the front panel
Delay Adjust control.
The screwdriver-settable Delay Adjust controls the
total delay time between the Delay 2 and Delay 3
outlets. For example, if the Delay Adjust control is
set to 30 seconds, Delay 1 outlets will go on immedi-
ately, Delay 2 outlets will receive power 15 seconds
after Delay 1 outlets, and Delay 3 outlets will receive
power 15 seconds after Delay 2 outlets. Therefore
the total delay time is 30 seconds.
The order is reversed on an OFF sequence. For
example, when an OFF sequence is initiated and
the Delay Adjust control is set at 60 seconds, Delay
3 outlets lose power immediately, Delay 2 outlets
lose power 30 seconds later and Delay 1 outlets lose
power 30 seconds after the Delay 2 outlets have
been shut off. The total delay time is 60 seconds.
In the event of a power out, of course all equipment
plugged into a PS-PRO will lose power simultane-
ously. However, when power is restored, the delayed
outlet groups will again turn on in the usual delayed
sequence (if set to maintained on mode).
outlet pair and three switched outlet pairs. The
switched outlet pairs are labeled Delay 1, Delay 2,
and Delay 3. (The other pair of outlets on the rear
panel and an additional single outlet on the front
panel are unswitched.)
Here’s how the PS-PRO works: When an ON se-
quence is initiated, power is immediately applied
to the Delay 1 outlets. Power is then applied to
Delay 2 and Delay 3 outlets per the 1-60 second
total delay setting you choose with the front panel
Delay Adjust control.
The screwdriver-settable Delay Adjust controls the
total delay time between the Delay 2 and Delay 3
outlets. For example, if the Delay Adjust control is
set to 30 seconds, Delay 1 outlets will go on immedi-
ately, Delay 2 outlets will receive power 15 seconds
after Delay 1 outlets, and Delay 3 outlets will receive
power 15 seconds after Delay 2 outlets. Therefore
the total delay time is 30 seconds.
The order is reversed on an OFF sequence. For
example, when an OFF sequence is initiated and
the Delay Adjust control is set at 60 seconds, Delay
3 outlets lose power immediately, Delay 2 outlets
lose power 30 seconds later and Delay 1 outlets lose
power 30 seconds after the Delay 2 outlets have
been shut off. The total delay time is 60 seconds.
In the event of a power out, of course all equipment
plugged into a PS-PRO will lose power simultane-
ously. However, when power is restored, the delayed
outlet groups will again turn on in the usual delayed
sequence (if set to maintained on mode).
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