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 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.
Telco – Satellite – Cable Transient Voltage Surge Suppressors
The SPR-20i 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 cable or satellite protector “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, cable or satellite signal will no longer pass through our protector, please contact your local service representative, installer or Furman for servicing. Since the telco circuit is 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 SPR-20i. 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 SPR-20i) then the protection circuit is damaged (assuming it worked properly before a storm or catastrophic event).
AC Voltage and Current Meter
Your SPR-20i 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 120VAC.
NOTE: For those that mount the SPR-20i 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.
