Furman Sound PS-8E Rear Panel Outlets, Mains Wiring Fault Analyzer, Power Conditioning Features

Rear Panel Outlets

Model PS-8R is shown. Model PS-8 is similar except the barrier terminal strip at right is not present.

120VAC

60HZ 15A

15

A

M

P

UNSWITCHED	DELAY 1		AVIS:	DELAY 2
CAUTION!	120 VAC	RISQUE DE CHOC
RISK OF ELECTRIC	60 HZ	ELECTRIQUE— NE
SHOCK. DO NOT			PAS OUVRIR
OPEN. REFER
SERVICING TO
QUALIFIED SERVICE
PERSONNEL.
TO REDUCE THE
RISK OF FIRE OR		®	®
ELECTRIC SHOCK
DO NOT EXPOSE	MAX		LISTED
THIS EQUIPMENT TO	LOAD		7Z37
RAIN AND MOISTURE.		PROFESSIONAL
	15A	AUDIO EQUIPMENT

DELAY 3	CLASS 1
	WIRING
	+12V
	STATUS
	REM IN
	GND

ON POWER UP:	This pair of outlets	This pair of outlets	This pair of outlets	This pair of outlets
	plus the one on the	comes on approx.	comes on approx. 5	comes on approx. 10
	front panel are on	1/2 second after the	seconds after the	seconds after the
	regardless of the	switch is turned on.	switch is turned on.	switch is turned on.
	switch position.
ON POWER DOWN:	Same as above.	This pair of outlets	This pair of outlets	This pair of outlets
		goes off approx. 10	goes off approx. 5	goes off approx. 1/2
		seconds after the	seconds after the	second after the
		switch is turned off.	switch is turned off.	switch is turned off.

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.

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.

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.

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.

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.