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<p>Does Bob need a 120V or 208V relay box for the pump? </p>
<p>The control signal for the relay box can come from the same cRio
output channel (+24V).</p>
<p>The cRio front panel override switch would be common for both the
pump and the chiller.<br>
</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 8/10/2018 8:51 AM, Yuri Gotra wrote:<br>
</div>
<blockquote type="cite"
cite="mid:50df7359-83d1-7329-8a01-a1c1c70fb0d9@jlab.org">Thank you
Peter,
<br>
<br>
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
<br>
<br>
<br>
On 8/10/18 7:51 AM, Peter Bonneau wrote:
<br>
<blockquote type="cite">
<br>
Attached is 2 myaPlot charts of the trip today at 4:33.
<br>
<br>
Sequence of events as seen by the hardware interlock system:
<br>
<br>
1) 4:26:25 - Cooling temperature starts rising.
<br>
2) 4:32:59 - Cooling pressure starts dropping.
<br>
3) 4:33:00 - Cooling in-flow starts dropping.
<br>
4) 4:33:06 - Cooling in flow drops to .5L/m - Interlock
limit=.5, cool in-flow status = 1 (Fault).
<br>
5) 4:33:08 - After the 2 sec delay (current delay setting) -
Cooling in-flow latched error.
<br>
<br>
Hardware interlock operated correctly during this event.
<br>
<br>
In this trip, cooling temperature started rising first,
otherwise the sequence is the same.
<br>
</blockquote>
<br>
<br>
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