lift (l i n e a r f i lt e r i n g t e c h n o l o g y )
Unfortunately, traditional AC filter - conditioners have been designed for unrealistic laboratory conditions. Prior technologies, whether multiple pole filter or conventional series mode, could actually harm audio and video performance more than they help, due to the resonant peaking of their antiquated, non-linear designs. Under certain conditions, these designs can actually add more than 10 dB of noise to the incoming AC line! Worse still, lost digital data, the need to re-boot digital pre-sets, or destroyed digital converters are frequently caused by excessive voltage spikes and AC noise contaminating the equipment ground. Furman’s SMP+ with LiFT takes another approach, ensuring optimal per- formance through linear filtering and no leakage to ground.
Description
The PS-PRO II is a power sequencer, meaning it is capable of powering a rack full of equipment in three steps separated by timed delays. It is use- ful whenever various kinds of equipment must be powered up or down in groups, rather than simultaneously. In audio systems, sequenced powering is often necessary to allow turn-on transients from low level amplifiers and pro- cessors 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 can cause circuit breakers to trip, even though the steady-state currents are not excessive. Power sequencing
is particularly suited to applications where large installations must be switched by inexperienced personnel.
The PS-PRO II is controlled by a front panel key-operated switch to provide security from non-authorized users tampering with the sys- tem. The switch has three positions: OFF, ON, and REM, allowing for local or remote control. With remote control, one or more PS-PRO II’s may be installed in remote locations with on/off control and LED monitoring via low-voltage control wires.
Besides its power sequencing capabilities, the PS-PRO II contains many other conditioning and protection features. Each aspect of its functioning will be discussed in the next sections.
installation 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 un- switched outlets. We suggest keeping the front panel's unswitched outlet free for equipment that is only in use temporarily.
The overall capacity of the PS-PRO II 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 II. Then push the black button on the circuit breaker (on the front panel) to reset it.
