Monitoring the generators. 

  The generators can be queried using the modbus protocol. The program that does this:

• Runs on galfas2. This as a connection to the generator ethernet
• source: svn/aosoft/src/Cummings/cgenlog.c .. see also cgen.c, Test/readMultiReg.c for debugging

01dec13: Generator startup with site as load.

• Top: generator state vs minutes fro startup.
• Each color is a different generator
• the y axis is the generator status (with labels on the left).
• All 4 generators start together, and then generators 4,3, and then 2 are idled.
• 2nd: generator output power
  
• each generator is plotted separately
• The light blue line is the sum of the 4 generators.
• The site was running at 300 KW prior to the power outage (from the site power monitoring)
• It took about 4 minutes for the generator output to reach 300 KW
• The actual outage occurred at 17:39:20.
• The telescope motion was stopped from 17:39:20 to 17:41:20.. so there is only 1 minute with no telescope motion.
• I wonder if the air conditioners take a few minutes to get up to full load?
• 3rd: fuel usage by generator
• the is gallons/hour Usage plotted every minute.
• bottom: Efficiency: (Kilo watt hours output) per (gallon/hour used)

Summary:

• On automatic startup (with site as load) all 4 generators start, and then get shed 1 at a time
• The shedding process takes 9 minutes
• The generator output took 4 minutes to return to the output prior to the outage.
• The telescope was only stopped for 1 minute
• It make take the air conditioners 4 minutes to come up to full output.

19Nov13: first look at data while sband transmitter is on.

    Data was taken on 19Nov13 while the sband transmitter was in operation. They sband  was transmitting around 850 KWatts.

• Generators 2,3,4 were in use.
• Data was sampled every 10 seconds.
• Data in stored in binary (svn/aosoft/src/Cummings/cgen_test.dat

• Page 1: Power, power factor
  
• top: power vs time. The power is by generator. Each color is a different generator.
• middle: Power factor vs Power(by generator).
• I computed the power factor as KW/KVA.
  
• The generators don't compute the power factor until the power exceeds about 40KW.
• bottom: power factor (by generator) vs power
• the power factor is above .9 above 200Kw/generator.
• Page 2: Voltage (Phase to ground) vs time
• Each frame is a separate phase (a,b,c)
• I'm not sure it the voltage spikes are real.
• Page 3: Current vs time
• Page 4: Pressures, temperatures.
• Top: pressure vs time for each generator
• Middle: Oil temperature vs time.
  
• You can see the pressure decrease as the oil temperature increases.
• Bottom: Coolant temperature vs time
• Page 5: fuel consumption and efficiency (by generator)
  
• Top: fuel consumption (Gallons/Hour)  vs time by generator
• The fuel used is recorded with .01 gallon resolution. The lower rates are pushing this resolution:
• 10gallon/hour = .028 gallons/10 seconds. So we saw maybe 3 counts change/ 10 sec sample.
• Middle: Fuel consumption vs output power (by generator)
• Bottom: Efficiency vs power (by generator).
• The vertical scale is : KiloWatts generated by 1 gallon/hour fuel consumption
• It looks pretty level down to about 200 KW/generator (then we run out of data).
• Page 6:Cumulative Power,consumption, efficiency (combining all 3 generators).
• Top: power vs time.
• Middle: fuel rate (gallons/hour) vs output power.
• bottom: efficiency (KW for 1 gallon/minute) vs output power.
• Page 7: Power, consumption blowup at startup and full power (sum all generators)
  
• Top: power at startup
• red line is cooling pumps off, green is cooling pumps on.
• 2nd: fuel rate at startup
• cooling off: 26 gallons/hour,
• This looks like the no load fuel rate needed.
  
• cooling on, 31 gallons/hour
• 3rd: power at full power
• 2180 kilowatts.
• bottom: fuel rate at full power:
• 187 gallons/hour

Summary:

Performance for  the 3 generators combined:

Usage (top)

    Hour used and fuel consumed .. by generator and totals.

• 2014 (.ps)   (.pdf)
• 2015 (.ps)   (.pdf)   (thru 01dec15)
  

processing: x101/generator/chkusage.pro

Documentation:  (top)

• Modbus address definitions for generators (.pdf)
• This is page 19-21 of C673b.pdf
• The actual addresses start at 1 to 40001.
• Contains the state, nfpa110, and extended status codes
• cummings network information documentation directory
  

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