Helios Rectifier Load Sharing Help Needed

[DerekStopz]

Hi,

In our lab we have 4 Helios 200C/48 rectifiers. We thought they were set up to load share. However, only 1 shows any current draw. The others all show 0 Amps. Can anyone give some pointers as to how to troubleshoot this?

Thanks, in advance.
Derek

Derek Stoparczyk

http://www.renrns.com

 

[CollegeFootball]

What NT# is on the rectifiers and what type of main unit are you using them in?

 

[DerekStopz]

Hi CollegeFootball,

We have 4 x NT5C05DB units with their output connected to an NT6C25 BB Conventional Controller unit. The NT5C05BBs are also connected to a NT6C43PA.

Sorry, should have mentioned that in my original thread.

Derek

Derek Stoparczyk

http://www.renrns.com

 

[DerekStopz]

Additional information:

The following LEDs are lit on the units supplying 0A: RFA, Auto ST & SEN Fail.

I have tried cycling the AC power, giving it time to shut down completely before turning it back on. The RFA LED stays on the entire time. The Auto ST LED and SEN Fails LED go off with the AC power and turns on within a second or 2 of the AC powering being turned on.

Scratching my head...



Derek Stoparczyk

http://www.renrns.com

 

[asodoma]

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.

 

[DerekStopz]

Thanks for the information Asodoma.

I've done some troubleshooting using this info. I also found the test jacks on the front panel. The AC input voltage is good and there is voltage appearing on the test jacks.

Where would the output fuse be located?

Thanks,
Derek

Derek Stoparczyk

http://www.renrns.com

 

[DerekStopz]

Thanks everyone for your suggestions and guidance. We had someone come in to take a look at the system.

He found that:
1) The alarm signal cables seem to be wired incorrectly, or connected to the patch panel improperly. So he disconnected them.
2) The current share lines were not ganged together. So he connected them.
3) The first unit was functional after the above steps. Just needed a slight calibration of the float voltage
4) The second unit has a defective bulk capacitor on the AC input. Indicated by the RFA signal. The nice humming noise gave it away.
5) The last unit seems to have a defective control board.

Thanks again.


Derek Stoparczyk

http://www.renrns.com