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
20 amp plugs, see the information sheet“What Kind Of Plug Is This, Anyway?” that accompanied this
manual, or request a copy from Furman.
POWER SEQUENCING 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).
