Furman IT-REFERENCE 15i Guide De L'utilisateur page 8

IT-R 15 O ' M
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efeRence wneR s anual
AC Transient Voltage Surge Suppression and Extreme Voltage Shutdown
Extreme Voltage Indicator
This LED is normally off. It monitors AC wiring faults – for example, accidental connection to an open neutral from a 208 or
240VAC feed (this is a common occurrence if the 15 Amp outlet source is not a dedicated line, but instead has been wired with
a daisy-chained neutral from a homes breaker box). The Extreme Voltage Shutdown (EVS) circuit senses voltages that are so
high that operation would be impossible and 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 140V, 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 extraordinarily rare instance that this occurs, the blue LED located in the center of the front panel will dim completely,
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.
Telco – Satellite – Cable Transient Voltage Surge Suppressors
The IT-Reference 15i features transient voltage surge suppression for both standard telephone lines, as well as 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 Telco, Cable and
Satellite connectors.
Note: It is not possible to make an in-line telco protector "virtually maintenance-free" as we have accomplished with the 120 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 telephone signal will no longer
pass through our protector, please contact your local service representative, installer or Furman for servicing. Since these circuits
are modular, replacement may be accomplished in seconds with a new TVSS module. To test this, simply disconnect the incoming
and out going cable from the IT-Reference 15i. Connect the incoming connector to the component that formerly received the out
going connector, thus by-passing the in-line protection. If the signal is present (but not when used with the IT-Reference 15i) then the
protection circuit is damaged (assuming it worked properly before a storm or catastrophic event).