Furman PRESTIGE Série Guide De L'utilisateur page 6

P-2400 AR OWNER'S MANUAL
8. Your P-2400 AR requires that a safety ground be present for proper operation. Any attempt to operate the unit without a safety
ground is considered improper operation and could invalidate the warranty.
9. Do not attempt to service your P-2400 AR beyond what is described in this manual. All other servicing should be referred to quali-
fied service personnel.
INSTALLATION
Because of the toroidal transformer design, the Furman P-2400 AR may be positioned near most other equipment without fear that
the other equipment will be disrupted by leakage of a strong 50/60 Hz magnetic field. Nevertheless, suggested rack locations would be
either at the top or bottom.
As with any rackmount equipment, be sure to use 10-32 machine screws for mounting in the rack's tapped holes (this is not a metric
size). In particular, beware of 10-24 screws, which may fit if forced but which will strip the threads. To avoid marring the front panel
finish, use plastic washers under the screw heads.
Rear Rack Mounting:
If you are installing the P-2400 AR in a rack that has rear as well as front mounting rails, you may easily secure it to the rear of
your rack. Simply remove the securing screws from the side and front portions of the P-2400 AR's adjustable rear rack ear and
reinforcement side plate (located on either chassis side), reverse it and re-attach to the P-2400 AR chassis. (See Figure 1.a, page 11)
OPERATION
Dimmable/Switchable Digital Voltage and True RMS Current Meter:
Furman's laboratory precision AC digital voltmeter continually measures incoming voltages within a typical tolerance of +/-1.5VAC. It
should be noted that the voltage reading is determined by the incoming AC source.
The Furman true RMS current meter constantly measures the total circuit AC load, with a typical tolerance of +/-0.5 amp. Because the
meter features True RMS technology, the current readings are accurate regardless of load conditions (capacitive, inductive, or resis-
tive).
To switch between voltage and current, press the button labeled "Line Voltage/Current". To change the display intensity, hold this but-
ton down for two seconds to cycle through the 3 stages of brightness.
Voltage Range Indicator:
This tri-color Voltage Range indicator is located in the lower left corner of the digital voltage meter lens assembly. When the incoming
AC voltage is within a capture range of 97-137V the tri-color indicator will be green (optimal), indicating the unit is in regulation. How-
ever, if the regulator encounters a temporary transient condition the indicator will turn amber (caution). This amber indication appears
when there are excessive changes or sudden swings at the input (+/-10 volts). If the incoming voltage is outside the capture range
(below 97V or above 137V) the indicator will turn red. Red warnings indicate the incoming voltage is far from optimal and beyond the
capture range offering a constant 120V. In this condition, the P-2400 AR will continue to regulate from the last tap of the autoformer,
providing an output voltage as close to 120V as possible (e.g. an input voltage of 92V would equate to 110V at output). When em-
ploying the P-2400 AR in mission critical applications where 120V is the primary concern, the red indication is invaluable.
Ultra-Low Resistance Magnetic Power Switch / Circuit Breaker:
Furman's Prestige Series 20 amp capacity power switch / circuit breaker is specifically designed to stand up to the enormous high in-
rush current demands of many power amplifiers. Additionally, Furman magnetic circuit breakers are not sensitive to temperature, nor
do they raise the AC impedance as do many less costly thermal breakers. If the 20 amp maximum RMS current capacity of the P-2400
AR is exceeded, the spring tensioned switch will immediately reset to the "Off" position. You will need to switch back to the "On" posi-
tion once the problem is corrected (typically by eliminating one component), or until the RMS current does not exceed 20 amps (2400
watts).
Total Current Capacity (maximum and minimum load):
The P-2400 AR can handle loads totaling up to 20 amperes as long as the input voltage is equal to or above 124 volts. For voltages
below that level, its capacity must be derated at approximately 170 milliamperes per volt. (See graphs on back page.) As a practical
matter, therefore, to cope successfully with worst-case brownout conditions, you should plan your total load so that it does not exceed
16.5 amps, or 1980 watts. Please note that this refers to the aggregate power requirement of all equipment plugged into the P-2400
AR, not to each individual item.
NOTE: While there is no minimum load requirement for the P-2400 AR you may experience an audible mechanical hum coming directly
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