Furman Sound PS-8RE - Manual (Page 3)

Remote Switching (Units with “R” Suffix Only*)
*Momentary mode switching is not available in PS-8R’s with serial numbers below H12757.
Model PS-8R and PS-8RE differ from the corresponding
models without the “R” suffix in the addition of a barrier terminal
strip on the rear panel that allows a switch to be connected to turn
the unit on and off at a distance, and also in the START ON-OFF
SEQUENCE pushbutton on the front panel.
In the most basic configuration, only two Class 1 wires and an
SPST switch are needed to initiate an ON or OFF sequence. The
switch may be either a momentary or maintained-contact type. If
a third wire is used, an LED may also be installed at the remote
end to indicate that the power is on.
Maintained vs. Momentary Contact Switching
Maintained switches, such as most toggle switches and
push-on/push-off button switches (including the Furman RS-1),
stay open until thrown, then stay closed until thrown again.
Momentary switches, usually pushbutton types like the Furman
RS-2, are normally open and stay closed only as long as the button
is pressed. An on-off switch of either kind may be used to actuate
the PS-8’s remote operation.
Maintained switches are generally most convenient when there
is only one remote location. When more than one switch location
is required, momentary switches allow the sequence to be started
from any location.
PS-8R units come factory-set for maintained operation. They
may be easily converted to momentary operation by moving
a jumper plug on the PS-8R’s circuit board. To do this:
1. Disconnect the unit from AC power.
2. Remove the four screws that secure the top cover.
3. In the rear left corner of the circuit board, there is an area
labeled “REMOTE CONTROL.” There are two pairs of terminals
in this area, one labeled “MAINTAINED” and the other
“MOMENTARY.” There is a small black jumper linking the
MAINTAINED terminals. Slide it up and off, and replace
itsecurely over the MOMENTARY terminals.
4. Reattach the top cover.
Maintained Mode
A simple connection of the REM IN terminal to the +12V
terminal initiates an OFF sequence. Disconnecting it initiates an
ON sequence. If the cable run is long, it is recommended that the
REM IN wire be tied to the PS-8R’s GND terminal during ON op-
eration rather than leaving it floating. This will require the use of a
third conductor and a double-throw switch.
The STATUS terminal is an output that may be used to
illuminate an LED at the remote location to indicate that power is
available at the PowerPort’s outlets. If it is high (+5V), the unit is
ON (or at least in the process of sequencing ON); if low, the unit is
OFF (or sequencing OFF). Simply connect the indicator LED
between STATUS and ground (do not use a series resistor). If the
LED does not light when the switch is in the ON position, check
the polarity and reverse the LED leads (if it is wrong). If a Furman
RS-1 is the controlling switch, contact Furman’s Tech Support de-
partment for the proper wiring diagrams.
In Maintained Mode, DO NOT USE the “START ON-OFF SE-
QUENCE” switch on the front panel. If you do, you may
activate an unintended partial turn-off sequence.
Momentary Mode
In Momentary Mode, the PS-8R has "memory" — it only needs
a momentary signal from the remote switch to change its state
from ON to OFF.
When first plugged in (or after power is lost and reapplied for
any reason) the "memory" state is OFF. This means the unit will
be OFF even if the front panel on/off rocker switch is on. It will stay
off until sequenced on by a momentary connection of the REM IN
terminal to +12V. The sequence starts on the rising edge of the
signal.
The front panel START ON-OFF SEQUENCE switch is in par-
allel with, and functionally equivalent to, one or more remote mo-
mentary switches connected to the barrier strip in the rear.
The “memory” is independent of the front panel on/off rocker
switch. This means that even if the unit is sequenced OFF by the
rocker switch on the front panel, when the rocker switch is turned
back on the unit will sequence back on — it will not be necessary
to push the START ON-OFF SEQUENCE button again. The unit
“remembers” its state until the incoming power is lost, which would
then default back to OFF.
The front panel rocker is not the primary means of control in
momentary mode, and should normally be left ON. It may be
a useful secondary means of control in the rare case of having
several PS-8R’s in parallel, if there is some reason to shut down
one unit without affecting the others.
Because it is a maintained-contact switch, the RS-1 is not an
appropriate remote switch for the PS-8R when it is in momentary
mode. The momentary-contact RS-2 would be the correct choice.
Multiple Units
You can use more than one PS-8R to handle loads that ex-
ceed 15 amps. The power input for each PS-8R should come from
a separate 15 amp AC circuit. To control PS-8R’s remotely with
one or more remote switches, connect the REM IN +12V (and
optionally GND) terminals of all units together. Be sure that the
mode (momentary or maintained) of all units is set the same. Con-
nect a single maintained switch or one or more momentary
switches to the nearest PS-8R, as discussed above. If you are
unsure whether your building wiring can accommodate multiple
fully-loaded PS-8’s or PS-8R’s, consult a qualified electrician.
If multiple PS-8R’s are controlled by one or more momentary
remote switches, they will all change state (from on to off or vice
versa) on each rising edge of the voltage on the REM IN terminal.
Any remote switch AND any of the grey pushbuttons on any unit’s
front panel will toggle all the units. The rocker switch on each unit’s
front panel will turn off any individual unit that is currently on, with-
out affecting the other units.
The STATUS lines work the same in either mode. Each
reflects the true state of the outlets of its unit, and is affected by
both the “memorized” state and by the front panel rocker switch. A
separate LED must be used to indicate the status of each PS-8R.
To take care of the case of having several PS-8R’s in parallel
that somehow get out of sync such that every time a remote
button is pushed, some units turn on and others turn off, there is
a special feature of the remote signal line:
Holding the REM line high for at least 4 seconds (whether by
an actual remote switch or by any unit's front panel switch) will
force all units to the OFF state, which will put them back in sync.
This is the only way to re-sync units other than disconnecting AC
power to all the units. Remember — operating the front panel
rocker switch does NOT affect the stored state of the unit, even
though it does temporarily turn the outputs off.
This section covers the case of multiple units in parallel
(all sequences initiate simultaneously). See “AC Relay Accessory
PS-REL” on the following page for a discussion of wiring multiple
units in series.