Lucent Technologies Lineage
®
2000 50A -48V 364A-3 SR Series Rectifier
Issue 6 January 1997 Product Description 2 - 5
High Reliability: The 364A3 rectifier’s forced convection
design improves the mean time between failure of its
components by a factor of two, thus ensuring high reliability.
Power Factor Correction Circuit: The SR series rectifiers
contain a power factor correction circuit that ensures power
factor above 0.98 for all loads above 50 amperes. This allows for
an input current waveshape with low harmonic distortion,
ensuring compatibility with engine alternators and UPS. The
power factor correction circuit also allows operation over a
much wider input voltage range than ferroresonant or silicon
controlled rectifier (SCR) technologies, eliminating the need for
tap changes in the rectifier.
Forced-Air Cooling: The SR series rectifiers use forced-air
cooling to help achieve high power density and light weight.
Each unit is equipped with an easily replaceable, self-contained
cooling fan. (See Section 7, Maintenance.) Thermal alarm
circuitry offers additional protection by shutting the rectifier
down and providing an alarm when the internal temperature
exceeds approximately 60° C. Forced air cooling improves the
reliability of the rectifier by reducing the internal ambient
temperatures of the rectifier to essentially the outside ambient
temperature. This allows Lucent Technologies to offer a
switchmode product that meets the same high reliability
standards as our ferroresonant rectifiers.
Self-Protection: Short circuits and overloads are handled safely
and automatically. Various monitoring and alarm signals are
generated by the rectifiers and sent to the ECS controller (if
present) for processing and further action. The resulting action
may be local or remote alarm indications or control signals fed
back to the rectifier. (Refer to the Lineage
®
2000 ECS Controller
Product Manual for a description of rectifier signal processing
and resultant action.) See Figure 3-1 for typical signal flow
between a rectifier and the ECS controller.
Batteries and Load: In most telecommunications applications,
the output of the rectifiers is electrically connected in parallel
with the batteries and the load. Under normal conditions the
rectifiers power the load and provide the float and charging
current required by the batteries. During a commercial ac power
outage, the batteries supply the dc power to the load. When ac
power is restored, the rectifiers recharge the batteries and supply
dc power to the load. No switching is needed in this transition
because of the parallel connection of the rectifiers and batteries.
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