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Operation 35
Helios Rectifier 25/48 Installation and User Manual
Start-up delay
This unit does not have a start-up delay.
Test points (V+, V-)
Test points allow the user to measure the voltage at the point of regulation.
A 100 ohm PTC resistor is placed in series with both leads to prevent
damage caused by short circuits at the jack terminals.
Indicators
Table 8 - Indicators
LAMP
DESIGNATION
COLOR DESCRIPTION
RFA Red/Green Rectifier Fail Alarm / normal operation
FAN ALM Red Fan Fail Alarm
Rectifier failure alarm (RFA)
The rectifier incorporates facilities for monitoring its operational status and
extends a global alarm upon detection of an internal failure. An abnormal or
out of range AC input voltage, an internal fuse failure, any circuit breaker
opening, any system or internal shutdown (for example: Thermal or HVSD),
or any internal failure causing a disappearance of power switching, will trigger
the RFA alarm and light up the RFA LED (color red) located on the front
panel. If the disappearance of switching, however, is caused by an incorrect
adjustment of the output FLT voltage, resulting in no output load, the RFA
will not be triggered since no real failure will have occurred.
Fan failure alarm
Loss of all or part of the cooling system activates the FAN ALM and lights
up the appropriate LED on the front panel. An RFA will be triggered, the
rectifier will be inhibited and both a FAN ALM and RFA will be generated.
The defective fan cooling fan unit can be ordered and replaced by the
customer.
Internal high voltage shutdown (HVSD)
The rectifier is equipped with a high voltage monitor. Whenever the rectifier
output voltage exceeds a preset value adjustable from -52 V to -59.5 V, the
rectifier shuts down. The rectifier will attempt to restart itself automatically
after an HVSD. However, if another HVSD occurs within approximately 5
minutes, the rectifier will shut down, lock out and transmit an RFA. This
function is independent of the output load condition. The AC breaker must
be toggled to reset the unit.