Alpha Technologies Cordex 48-1kW 23 4000W - Manual (Page 25)

Argus Technologies Ltd. 010-566-C0 Rev C WC
Printed in Canada. © 2005 Argus Technologies Ltd. ARGUS and CORDEX are trademarks of Argus Technologies Ltd. All Rights Reserved. Page 3 of 11
2.3 Rear Panel
Located on the rear panel of the rectifier are connectors for shelf power and communications.
2.4 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% 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
1 . A minimum 2.5% 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.
NOTE: For Cordex rectifier systems without batteries (or with a very light load; below 2.5% of rated output) it is
recommended that the ramp test be disabled to avoid nuisance alarms. The Ramp Test feature is
enabled/disabled via the CXC menu item: Rectifiers, Configure Settings.
2.5 Heat Dissipation
Heat dissipation is achieved through natural (bottom to top) convection cooling.
NOTE: Some rectifier shelves incorporate fan aided cooling to increase the temperature rating of the module. See shelf
manual supplied with your system.
2.6 Over Temperature Protection
Each module is protected in the event of an excessive increase in temperature due to component failure or
cooling airflow blockage. During over temperature conditions, the rectifier limits the output power as well as the
output current. At 65ºC output power and current limit are reduced to 70%. If temperature continues to
increase, a shutdown of the rectifier is initiated. The rectifier shall restart automatically if the temperature has
returned to a safe level.
2.7 Wide AC Range
A minor alarm is generated when the AC input voltage drops below 180Vac. Output power is reduced linearly
below 150Vac to 40% of the rated output power. At a lower voltage the module will shut down and will not restart
until the AC is greater than or equal to 150Vac.
For voltages above 276Vac, power factor and total harmonic distortion may be derated. For voltages between
277Vac and 320Vac, the rectifier may not be operational but shall not suffer any damage.
2.8 AC Inrush/Transient Suppression
The modules’ inrush current is limited to less than one times the nominal peak line current to prevent surge on the
AC line. Modules are also protected from input lightning and transient surges in accordance with IEEE/ANSI
C62.41 Category B3.
2.9 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 output voltage is ramped up from the minimum voltage to the float
voltage.
1 A battery connected to the output of the rectifier will draw current when the voltage ramp occurs. Therefore the rectifier fail alarm will not be generated
with a battery connected.