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User Guide
Cordex HP 2.4kW / 3.0kW Modular Switched Mode Rectifier
4.2.5 Over temperature protection
Blockage or obstruction to the air flow can result in the internal temperature to rise and reduce the output power
or even shut down the rectifier. The rectifier will resume normal operation when the temperature reduces to a safe
level. Over temperature shut down can also occur when a fan failure has occurred.
4.2.6 Wide AC range
The rectifier delivers up to 2400W of power between 187Vac and 310Vac input voltage. The rectifier can deliver
up to 1200W between 90Vac and 187Vac.
During start up the rectifier begins to provide power for input voltage >95 Vac and shuts down if the input voltage
drops below 85Vac. The THD and power factor will be out of specs for input >277Vac.
4.2.7 AC inrush/transient suppression
To prevent a surge on the AC input line, the inrush current of a rectifier module is limited to the full load steady
state line current. Modules are also protected from input lightning and transient surges in accordance with ANSI/
IEEE C62.41 Category B3 standards.
4.2.8 Soft start
A soft start feature is used to eliminate an instantaneous demand on the AC power source. A soft start, sometimes
referred to as a "current walk-in", works by gradually (up to five seconds) ramping up the DC output current limit
from zero to the actual or defined customer setting. The rectifier output voltage is ramped from the minimum
voltage to the float voltage.
This feature along with Start Delay prevents any instantaneous surge demand from the utility.
4.2.9 Start delay
The rectifier modules are equipped with a delay timer to stagger-start a series of modules. When multiple modules
and multiple shelves, part of a larger system are used in conjunction with a controller, a start delay prevents
all rectifiers from starting at the same time and causing an inrush on the utility. The default start delay is set
to 1 second and can be adjusted up to 250 seconds on the Cordex HP controller. The built-in timer delays the
switching on of the module by the start delay interval (up to 250 seconds), which is set in the controller.
4.2.10 Current limit/short circuit protection
The current limit function determines the maximum output current limit of the rectifier module, regardless of
the output voltage or power. The maximum output current is limited to a constant value down to a short circuit
condition. Current limiting can be used to mate the rectifier output current ampacity to the needs of the load and
parallel battery to minimize excessive battery recharge currents.
The rectifier will sustain a continuous short circuit at the output terminals. The maximum short circuit current will
not exceed 50A per module.
4.2.11 Power limiting
Each rectifier module is designed to limit the power output to the module specification. This enables more current
to be supplied at lower output voltages, and allows matching the output power to the demands of constant-power
loads often seen in telecom equipment.
This feature can also be used for a faster recharge of flooded batteries paralleled with the load.
NOTE
The current limiting feature overrides the power-limiting feature.
0100037-J0
Rev D
19
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