210922001-J0 Rev A
Cordex® CXPS-E105 Edge Power Systems
User Guide
LED activity during power save
When a rectifier is put into power save mode, only the AC ON LED remains illuminated.
4.3.4 Rectifier features.
True module fail alarm
The power modules have a true fail alarm. This provides a true indication of the power module’s ability to source
current. When the module’s output current drops below 2.5 percent of the rated output a low output current
condition is detected and the Module Fail detection circuit is activated. This circuit momentarily ramps up the
output voltage to determine if the module will source current. If no increase in current is detected, the Module
Fail alarm is activated. The module will test once every 60 seconds for the condition until current is detected.
Output voltage ramping will cease upon detection of current.
A minimum 2.5 percent load is required to avoid the Ramp Test Fail alarm; this can typically be provided with the
parallel system battery. Activation of this alarm could indicate a failed module or a failed load.
Heat dissipation
Each rectifier module is equipped with a front-mounted, variable-speed fan. The fan speed is determined based
on ambient temperature, rectifier temperature, and the load. Air flow is front-to-rear with the exhaust air exiting
through internal vents at the rear of the unit. The fan may spin in required situations.
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. The rectifier; to protect
itself from ambient over temperature scenarios; will limit its output power.
Wide AC range
The rectifier delivers full power between 187 Vac and 310 Vac input voltage. The rectifier can deliver up to
58percent power between 90 Vac and 187 Vac. During start up the rectifier begins to provide power for input
voltage >95Vac and shuts down if the input voltage drops below 85 Vac. The THD and power factor will be out of
specification for input >277 Vac.
AC inrush/transient suppression
An external surge suppressor is not required at the AC input, modules are protected from input lightning and
transient surges in accordance with IEEE/ANSI C62.41 Category B3.
Soft start
To eliminate an instantaneous demand on the AC source, a soft start feature is employed. Soft Start, sometimes
referred to as current walk-in, works by gradually (up to five seconds) ramping the current limit up from zero to
the actual or defined customer setting. The rectifier output voltage is ramped up from the minimum voltage to the
float voltage.
NOTICE
For Cordex® HP rectifier systems without batteries (or with a very light load; below 2.5 percent
of rated output) it is recommended that the ramp test be disabled to avoid nuisance alarms. The
Ramp Test feature is enabled and disabled via the controller. Refer to the software manual for
detailed information.
To Next Page
Loading...
Need help?
General