DESCRIPTION
The Furman PS-8R Power Sequencer is needed whenever various kinds of equipment must be powered up or down in groups, rather than all simultaneously. In audio systems, sequenced powering is often necessary to allow turn-on transients from low level amplifiers and processors to settle down before any power amps are turned on, because simultaneous powering would result in a loud, annoying, and potentially destructive “pop” reaching the speakers. And in any large system whose components present an inductive load to the AC line (including electric motors, power supplies, and power amplifiers of all kinds), sequenced powering can avoid excessive inrush currents that cause circuit breakers to trip even though the steady-state currents are not excessive.

Using the PS-8R is a simple and inexpensive way to apply and remove power in a controlled, repeatable, foolproof 3-step sequence. It is ideal when large installations must be switched by inexperienced personnel. The PS-8R provides three outlet pairs labeled Delay 1, Delay 2, and Delay 3, that receive power almost immediately, 5 and 10 seconds respectively after the front panel switch is thrown to “ON.” When thrown to “OFF,” the sequence is reversed, with Delay 3 losing power almost immediately, Delay 2 after 5 seconds, and Delay 1 after 10 seconds. The delay intervals are preset at these durations, but may be altered by means of an internal trimpot adjustment. In addition to the delayed outlets, a single front panel outlet and a rear panel pair are unswitched. All rear panel outlets are standard 120V, 15A duplex types; isolatedground “super spec” outlets may be substituted at additional cost. The PS-8R offers all basic power conditioning features besides its sequencing capability. It provides varistor spike and surge protection across all three modes, as well as a sophisticated EMI/RFI filter for blocking radio frequency line noise. Clean, filtered power is provided at all 9 outlets, even the unswitched ones.

The PS-8R 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. If a fault is present, a chart next to the indicators will identify its exact nature.

PS-8R Architects and Engineers Specifications
The Power Sequencer shall provide three delayed outlet pairs with a delay time interval of 5 seconds, controlled by a front panel master switch. The on-off sequence shall be initiated either locally or with a momentary or maintained contact switch at a remote location, connected with Class 1 wiring. Outlet switching shall be by means of relays with silver cadmium oxide contacts rated at least 30 amps for inductive or resistive loads. Relay life expectancy shall be at least 100,000 operations at rated load. Printed circuit boards shall be 3 oz. copper FR4 glass epoxy. Indicator lights shall be provided to signal when power is available at each of the delayed outlets. All outlets shall be rated 15 amps. Unswitched outlets shall be provided both in front and rear. Spikes at all outlets shall be clamped to no more than 250 V peak (line to neutral, line to ground, or neutral to ground.) Response time shall not exceed 1 nanosecond. The unit shall absorb a surge current of up to 5000 amperes for 10 ms without damage. RF noise attenuation shall exceed 40 dB (transverse mode) and 60 dB (common mode) from 1 to 200 MHz. A 15 amp circuit breaker shall be provided, and the AC cord shall be 14 ga. and ten feet long.

The Power Sequencer shall mount in a standard 19" rack, and occupy no more than one unit (1.75") of rack space. It shall be designated the Furman PS-8R.

Three Year Warranty
The Furman PS-8 and PS-8R are protected by a three year limited warranty covering defects in materials and workmanship.