[dsg-svt] Fwd: SVT Cooling System Trip Analysis (Hardware Interlock)

[Peter Bonneau]

Does Bob need a 120V or 208V relay box for the pump?

The control signal for the relay box can come from the same cRio output 
channel (+24V).

The cRio front panel override switch would be common for both the pump 
and the chiller.



On 8/10/2018 8:51 AM, Yuri Gotra wrote:
> Thank you Peter,
>
> Today's trip is caused by the circuit breaker. Around 4 am I started 
> warming up the tracker to prepare for the target alignment work. The 
> chiller and the external pump are on the same 20 A breaker (connected 
> via the relay). The chiller draws 15 A and the pump 3 A. When heater 
> is operational there could be current jumps over 20 A. Bob requested 
> separation of the pump and the chiller power which requires extra 
> relay box. Could you please provide another relay box with additional 
> control line from the hardware interlock box connected to the 
> interlock system the same way as for the existing relay box. I believe 
> splitting the same control line would do. Thank you
>
>
> On 8/10/18 7:51 AM, Peter Bonneau wrote:
>>
>> Attached is 2 myaPlot charts of the trip today at 4:33.
>>
>> Sequence of events as seen by the hardware interlock system:
>>
>> 1) 4:26:25 - Cooling temperature starts rising.
>> 2) 4:32:59 - Cooling pressure starts dropping.
>> 3) 4:33:00 - Cooling in-flow starts dropping.
>> 4) 4:33:06 - Cooling in flow drops to .5L/m - Interlock limit=.5, 
>> cool in-flow status = 1 (Fault).
>> 5) 4:33:08 - After the 2 sec delay (current delay setting) - Cooling 
>> in-flow latched error.
>>
>> Hardware interlock operated correctly during this event.
>>
>> In this trip, cooling temperature started rising first, otherwise the 
>> sequence is the same.
>
>
>
> _______________________________________________
> dsg-svt mailing list
> dsg-svt at jlab.org
> https://mailman.jlab.org/mailman/listinfo/dsg-svt

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_svt/attachments/20180810/21233779/attachment-0002.html>