[evla-sw-discuss] Feed heaters

[Wayne Koski]

Currently, the control for the Feed Heaters is via the F320:

F320.FEED_HEATER_CMD=1

I believe Operations is setting this using the weather station 
temp/dewpoint status, probably manually.

I used the F320 as the F317 and M302/M303 didn't exist, and felt that 
the F320 would last long enough for me to incorporate it in the M303 
(ie. rewire all the racks) at a leisurely pace.

-wayne-

Bryan Butler wrote:
> i thought at one point that rich was going to put this control onto the F317 
> operator's screen (the equivalent of 1 + 2 below)?
> 
> rich can correct me if wrong, but my recollection is of seeing a diagram that 
> bob hayward gave rich, which had the feed heater info (and ability to control) 
> on it.
> 
> 	-bryan
> 
> 
> On 12/20/06 10:02, Barry Clark wrote:
>> Jim Ruff was just in my office asking about automated control of the
>> feed heaters.  They should be turned on/off by the dewpoint depression
>> below ambient, as found from the weather station.  Implementation should
>> wait for the installation of the M303, where the control will eventually
>> be moved.
>>
>> Three possible places to put this code:
>> 1.  Operator's screen.  Approach would be same as for VLA - if software
>> believes heaters are in wrong state, tell operators, who then have a
>> way to send command to all known MIBs.
>> 2.  M302 screen. (along with other M302/3 functions like E-stop etc.).
>> Again would take the "recommend to operator" approach.
>> 3.  AntennaPhysical.  Easy to implement an automated function.  However,
>> one would like to have an operator override capability.  Adding a 'rest'
>> or 'mib' interface would be a possible way to implement this.  Not quite 
>> sure what screen would talk to it, though.
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