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Functional description 35
Emerson Energy Systems Rectifier 200I/48NT5C05C Installation and User Manual
HVSD ( high voltage shutdown )
The rectifier monitors itself for high voltage and will shut down when its
output voltage exceeds a preset adjustable value ( between -52 V and
-60 V ).
RFA ( rectifier failure alarm )
The rectifier monitors its operation and triggers a global RFA if it detects
an internal failure, causing the RFA LED to light up. One of the following
will trigger an alarm :
• abnormal or out of range ac input voltage
• output fuse failure
• system or internal shutdown ( thermal, HVSD, TR )
• internal failure causing a power switching malfunction
If the switching malfunction is caused by an improper adjustment of the
output float voltage, the RFA alarm will not be triggered. The RFA feature
will be activated if the ac power is removed in a system where batteries are
present.
SEN FAIL ( sense fail alarm )
This LED lights up if the remote sense leads are not connected, or if the
RC fuse has blown.
THSD ( thermal shutdown )
This LED lights up when the rectifier is protecting itself against
overheating by suspending its operation for the duration of the high
temperature condition. An RFA alarm will also be triggered.
4.2.4. Local and remote adjustments and controls
The current and voltage calibration, adjustment and control can be set
through potentiometers and switches ( see Table 11 ) located on the front
panel, or by remote signals sent from the controller ( see Tables 8 and 12 ).