The condition will also be generated if any menu other than normal & status mode is selected.
MODULE FAIL, AC MAINS FAIL, AC MAINS HI, OVER TEMPERATURE, UPF HI TEMP, FAN
FAIL alarm discrimination circuitry is factory set. All alarms are 'real time' and therefore do not
latch. The Module fail alarms are “fail safe” and therefore will extend an alarm without a source of
D.C. present (ie. a battery), however, the indicators will not remain illuminated unless there is D.C.
power available (ie. a battery or a second operational unit in parallel).
3.3.11 True Module Fail Alarm
RSM series of rectifiers have a 'true' fail alarm. This alarm provides a true indication of the Mod
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ule's ability to source current. When the Module's current output drops below five percent of the
rated output, the Module fail detection circuit is activated. The circuit momentarily ramps up the out
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put voltage by >3 volts to determine if the Module will source current. If no increase in current is de
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tected the Module fail alarm indicator & relay will turn on, the message MODULE FAIL will be dis
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played on the LCD panel. Newer versions of software will also display the message NO OUTPUT
POWER. The Module will test every 60 seconds for the condition until current is detected. The out
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put voltage ramping is terminated upon detection of current.
The ramp is inhibited during the TEST mode or ADJUSTMENT mode.
3.3.12 Low Voltage Alarm
When the output of the Module drops to the level set by the setting found in the submenu ADJUST
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MENTS. The minor alarm indicator & relay will turn on and the message LOW O/P VOLTAGE will
be displayed on the LCD panel. When the output level is raised above the alarm level, the alarm
and indicator will extinguish. The alarm has a fixed hysterisis of 3V for a 48V system and 1.5V for a
24V system.
3.3.13 High Voltage Alarm
When the output of the Module rises to the level set by the setting found in the submenu ADJUST-
MENTS, the minor alarm indicator & relay will turn on and the message HIGH O/P VOLTAGE will
be displayed on the LCD panel. When the output level is lowered below the alarm level, the alarm
and indicator will extinguish. The alarm has a fixed hysterisis of 1V for 48V systems and 0.5V for
24V systems.
3.3.14 Current Limit
The current limit circuit of the RSM Module provides a primary response to output overcurrent situa
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tions. Rather than tripping the output breaker, the current limit circuit will protect the unit from over
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load situations. The level at which the current limit engages is set by the setting found in the sub
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menu ADJUSTMENTS. When the output current reaches the preset level the output voltage will de
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crease thereby, limiting the output current of the unit. CL will be displayed by the output current on
the LCD display. If the unit is driven far into current limit the output voltage may decrease to the
point of a LOW O/P VOLTAGE alarm. The minor alarm indicator & the cabinet's relay will turn on, if
the function has not been disabled under the protected adjustments sub menu. The level is pro
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tected by fail safe circuitry in the unlikely event of micro-controller failure. Below the lowest operat
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ing voltage the current limit will be folded back to approximately 50% in a short circuit condition.
During Fan Fail, the current limit level should not be adjusted. The current limit level can not be ad
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justed upwards from its previous setting and can not be increased above the level set by the mod
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ule during a fan fail. The module will automatically return to the last current limit setting after the
fan failure has been corrected. If the current limit level is adjusted during a fan failure, the unit will
reset to the new setting after the fan failure has been corrected. This feature is implemented on all
RSM-48/50, RSM-24/100, RSM-48/30, and RSM-24/50 modules with software version 2.30 or later.
ARGUS TECHNOLOGIES 010-030-C0 Rev E Page 9 of 42
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