Emerson NT5C06D Start-up delay, Test points V+, Indicators, Rectifier failure alarm RFA

Operation 35

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	COLOR	DESCRIPTION
DESIGNATION
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.

Helios Rectifier 25/48 Installation and User Manual