What is redundancy?
The inclusion of one or more extra rectifiers to improve system reliability. N+1 redundancy means that the system has one rectifier more than the total power required by the load.
How does the rectifier power limiting work?
Power Limiting is a feature employed by modern rectifiers to maintain a constant level of output power under varying output voltage conditions. Power limiting is most useful during overload conditions, where one or more rectifiers in a DC power system may have failed or when it is necessary to quickly recharge a discharged battery.
All Cordex rectifiers are able to limit their output power at a value that can be set in the controller's software.
What is the meaning of the unit U?
A rack unit or U (less commonly RU) is a unit of measure used to describe the height of equipment intended for mounting in a rack. One rack unit is 1.75 inches or 44.45 mm high.
What does it mean to "hot swap" modules?
Operators never have to interrupt service as the power modules slide easily in or out of the cabinet even while the system is online. All Cordex rectifiers are hot swappable. Maintenance is worry-free with the Cordex hot swappable, front access design rectifiers.
What is the backup time?
The backup time interval for the load during a power failure during which the battery is discharged down to 1.75 V/Cell.
What is SNMP?
Simple Network Management Protocol is a standard set of rules for data transmission and reception. Developed in 1988, these rules provide a base for network software and firmware designs.
What is MTBF?
Mean Time Between Failures is the predicted elapsed time between inherent failures of a system during operation
Typically one of two MTBF calculation standards is used: Telcordia (as defined in SR-332), or MIL-HDBK 217F (Ground Benign). Ground Benign (GB) is considered to be a normal Telco office type environment, with nominal air conditioning and temperature control.
What is temperature compensation and why is it used?
Temperature compensation - as used in DC power systems - is the procedure of varying the charging voltage applied to a rechargeable battery based on its temperature. Batteries require a higher charging voltage than the voltage normally specified at temperatures below 25°C (the 'normal' operating temperature is generally assumed to be 25°C) and a lower charging voltage at temperatures above 25°C. If a battery is charged at too low a voltage (at a temperature below 25°C), the resulting battery charge will be insufficient. Consequently, the battery's cycle life may be shortened and its capacity will be temporarily or permanently reduced. If a battery is charged at too high a voltage, (at a temperature above 25°C), there will be excessive heat generation and water decomposition in the battery. As a consequence, the battery's cycle life will be shortened, its capacity reduced, or even a total failure of the battery could occur due to thermal runaway.
What is the meaning of Peukert's number?
The Peukert's number is a battery specific parameter that shows how well the battery holds up under high rates of discharge - most range from 1.1 to 1.3, and the closer to 1, the better.
Peukert's law expresses the capacity of a lead–acid battery in terms of the rate at which it is discharged. It describes an exponential relationship between the discharge current and delivered capacity, over some specified range of discharge currents.
T = C / In
T = time in hours, C = the capacity at a one-ampere discharge rate (in Ah), I = the actual discharge current relative to 1 ampere, n = Peukert's number
Cordex CXC controllers have a built in calculator for Peukert's number