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CLASS 1
WIRING
15
A
M
P
AVIS:
RISQUE DE CHOC
ELECTRIQUE—NE
PAS OUVRIR
15A
LOAD
MAX
120 VAC
60 HZ
15A
LISTED
7Z37
PROFESSIONAL
AUDIO EQUIPMENT
®
UNSWITCHED DELAY 1 DELAY 2
DELAY 3
+12V
STATUS
REM IN
RISK OF ELECTRIC
SHOCK. DO NOT
OPEN. REFER
SERVICING TO
QUALIFIED SERVICE
PERSONNEL.
TO REDUCE THE
RISK OF FIRE OR
ELECTRIC SHOCK
DO NOT EXPOSE
THIS EQUIPMENT TO
RAIN AND MOISTURE.
CAUTION!
GND
®
120 VAC
60 HZ
Model PS-8R is shown. Model PS-8 is similar except the barrier terminal strip at right is not present.
Note: “The switch” referred to in this chart is either the front panel switch or, if used, the remote switch connected to the terminal strip of a PS-8R.
ON POWER UP:
ON POWER DOWN:
Same as above.
This pair of outlets
plus the one on the
front panel are on
regardless of the
switch position.
This pair of outlets
goes off approx. 10
seconds after the
switch is turned off.
This pair of outlets
comes on approx.
1/2 second after the
switch is turned on.
This pair of outlets
goes off approx. 5
seconds after the
switch is turned off.
This pair of outlets
comes on approx. 5
seconds after the
switch is turned on.
This pair of outlets
goes off approx. 1/2
second after the
switch is turned off.
This pair of outlets
comes on approx. 10
seconds after the
switch is turned on.
Rear Panel Outlets
the circuit breaker (on the rear panel) down and in to reset it.
Although 15 amps is an absolute limit, the PS-8’s power
sequencing capability will allow you to come as close as possible
to using the full 15 amps, because the risk of tripping the breaker
is greatly reduced. This is because the PS-8 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.
Power Conditioning Features
The PS-8 offers all basic power conditioning features besides
its sequencing capability. It provides varistor spike and surge
protection across all three modes (line to neutral, line to ground,
and neutral to ground), responding in nanoseconds to clamp
excessive transient voltages to safe levels. There is also a
sophisticated multi-stage filter for blocking radio frequency line
noise. The filter works to prevent noise from fluorescent lights,
certain dimmers, radio transmitters, and similar sources of
“electronic pollution” from leaking from the AC line into sensitive
audio, video, or computer circuits. Clean, filtered power is
provided at all 9 outlets, even the unswitched ones.
Despite its many protective features, you should be aware that
the PS-8 does not compensate if the AC line voltage itself is high
or low (i.e., it does not compensate for brownout conditions). If
you frequently move your rack to different locations, derive power
from generators, use long extension cords, travel internationally,
or are in an area particularly prone to brownouts, you may benefit
from the use of one of Furman’s AC Line Voltage Regulators in
addition to the PS-8. If you do use a voltage regulator, run the raw
power line into the regulator first so that the PS-8 receives a
stabilized voltage to distribute.
Mains Wiring Fault Analyzer
The PS-8 also assists in analyzing any faults that may occur
in the AC mains wiring. Two green and one red neon indicators
light in a specific pattern for normal wiring and in different
patterns for various faults. When the AC wiring is correct, both
green indicators will be lit, but not the red indicator. If any other
pattern of indicators is lit, a fault is present. The chart next to the
indicators identifies its exact nature. Since any wiring fault
presents a potentially serious safety hazard, the assistance of a
qualified electrician should be obtained in correcting the problem.
Adjusting the Delay Interval
The delay interval (the time between the turn-on or turn-off of
outlets 1 and 2, or 2 and 3 — not 1 and 3) is factory preset at
approximately 5 seconds. It is possible to lengthen or shorten the
delay interval by making an internal adjustment to the PS-8.
However, due to the risk of electric shock, this procedure should
only be done by a qualified technician.
Unplug the PS-8 and remove its top cover by unscrewing the
four screws that secure it. The delay adjustment is Trimpot VR1,
located on the printed circuit board near the front left corner. It is
the only trimpot on the board. It is equipped with a thumbwheel for
easy adjustment. The range of adjustment of the delay
interval is from a minimum of about 1 second to a maximum of
about 7 seconds.
220/240V Versions (Units with E Suffix Only)
Models PS-8E and PS-8RE are intended for use in countries
with nominal 220 to 240 volt AC lines. They are identical
to the PS-8 and PS-8R except their rear panel outlets are the
internationally-accepted IEC-320 connectors. They are rated at
10 amps.