AC Transient Voltage Surge Suppression and Extreme Voltage Shutdown
Extreme Voltage Shutdown Indicator
This LED is normally off. It monitors AC wiring faults – for example, accidental connection to an open neutral from a 300VAC
or greater feed. When the Extreme Voltage Shutdown (EVS) circuit senses voltages that are so high that operation would be
impossible, it shuts the power down before damage can occur. Upon initially applying power to these units, the Extreme
Voltage indicator LED will light if the input voltage is above the extreme voltage cutoff, and power will not be applied to the
unit’s outlets. If the unit has been operating with an acceptable input voltage and subsequently that voltage exceeds 275V, it
will shut off power to the outlet and the Extreme Voltage LED will light.
Protection OK Indicator
Although the Furman SMP circuit assures virtually maintenance free protection from transient voltage spikes and surges,
nature has a way of occasionally creating electrical forces that are beyond the capabilities of any Transient Voltage Surge
Suppression device to absorb without some degree of damage. In the rare instance that this occurs, the blue LED located in
the center of the front panel will dim, even though AC power is present at the unit’s outputs. If this happens, some level of
protection from voltage surges will remain, but the Furman’s clamping voltage rating will be compromised. The unit must be
returned to Furman Sound, or an authorized Furman Service center for repair.
NOTE:
If the mains power is above the high cutoff voltage and has caused the unit to remove power from its outlets, it cannot restore
power without the operator manually turning the unit off, then on again. Avoid turning the unit back on without first checking the
source of the problem, and perhaps changing the AC source.
Cable/Satellite Transient Voltage Surge Suppressors
The SPR-16E i features transient voltage surge suppression for cable or satellite lines utilizing standard coaxial connectors. As
these surge suppressors are in-line, they will require an additional cable to connect from their output to the control device
requiring protection.
All in-line surge suppressors feature our exclusive ground contamination-free technology. This aids in eliminating audio
buzzing, and the video hum-bars that can result from typical in-line suppressors. Further, our cable and satellite suppressors
are TiVO®/DVR friendly as well as HD-Digital Television ready. Both DC carrier signals as well as high bandwidth signals can
pass through our circuit. In fact the bandwidth is less than 0.1dB loss at 1GHz!
To connect your cabling to these in-line protectors, simply follow the in and out indications marked next to the Cable -
Satellite connectors.
NOTE:
It is not possible to make an in-line cable or satellite protector “maintenance-free” as we have accomplished with the 230
VAC line. This would necessitate limited signal bandwidth that would not allow the signal to pass. Under extreme conditions, it is
possible that the surge suppression in one of these devices could sacrifice itself after a catastrophic event. If the cable or satellite
signal will no longer pass through our protector, please contact your local service representative, installer or Furman for servicing.
AC Voltage and Current Meter
Your SPR-16E i contains a true RMS precision incoming AC volt/current meter. This meter continuously monitors either the
incoming AC voltage, or the total system AC current draw. To continuously read current or voltage, simply select the setting
you wish to monitor by either pressing the voltage/current switch for current, or disengaging the switch for voltage. Since the
AC voltage meter indicates incoming voltage, you should not be concerned by readings above or below 230VAC.
NOTE:
For those that mount the SPR-16E i where it could be visible during use, we have included a rear panel mounted dimmer
switch for the blue digital voltage and current meter. This allows the user to entirely dim this display when the room lights are
turned off for optimum video viewing.
