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Installation
Equipment Connection
There are two DC power output terminals on the rear of PR power supplies: POSITIVE (+)/
RED, and NEGATIVE (-)/ BLACK. With all equipment turned OFF, connect the DC equipment to
these terminals, making sure to observe the polarity of the wiring. Connect Positive to Positive
(Red to Red), and Negative to Negative (Black to Black).
Power Supply Start-Up
1
Plug the power supply line cord into a 120V AC, 60Hz outlet.
2
Press the “ON/OFF” switch on the front panel. The switch body (or indicator light on smaller
models) will illuminate RED, indicating the power supply is functioning properly.
3
Turn the connected DC equipment ON only after the power supply has been turned ON.
Current Ratings
Tripp Lite PR series’ power supply current ratings are based on the industry standard ICS
(Intermittent Communications Service), limited by heat buildup. This translates to a 50% duty
cycle of 5 minutes ON, 5 minutes OFF. Equivalent heat loading would result from 7 minutes ON
at 25% load, followed by 3 minutes ON at 100% load. This cyclical-type of loading is similar to
the operation of a transceiver.
Make sure the equipment you are using is properly sized to the capacity of the power supply.
The maximum current draw of the equipment should not exceed the continuous duty output of
the power supply. If unsure about your particular application or current output capacities, visit
www.tripplite.com/support.
The PR series features electronic foldback current limiting, which protects against short circuits
on the DC output. The foldback circuitry reduces the output current to less than one amp when
shorted. When the overload is removed, normal current and voltage outputs are automatically
restored.
The PR7 through PR60 models feature time-controlled current limiting that delays onset of
foldback current limiting for about one second. This allows a brief delivery of higher-than-
rated current during this time period, allowing operation of incandescent lamp loads up to
approximately 65% of the PR’s current rating. The power supply will also supply repetitive peak
currents of up to 160% of the current rating for operation of high-power
”Class B” audio amplifiers.
CAUTION!
This time-controlled current limiting will NOT overcome severe or sustained
overloads. Some loads may demand peak current more than twice as high as
their average current demand. This fact should be kept in mind when using the
PR series power supplies.
Troubleshooting
If the power supply stops working, check the DC output connections and tighten if loose.
Check the external fuse. If blown, replace with the same amperage size only. Units with an
internal fuse should be checked by a qualified technician.
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