DQRID : D011019.8
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/06/1999120010/15/19991200Incorrect
more
Subject:
TWP/SKYRAD/C2 - Solar tracker failure
DataStreams:twpskyrad60sC2.a1, twpskyrad60sC2.b1
Description:
During Reset7 (8/6) the skytracker firmware was upgraded for Y2K.  While still at the 
site, the mentor noted that the tracker was sticking and replaced it on 8/8/99. The 
replacement tracker also failed.  Repeated attempts through 8/13 were not successful.  After 8/13, 
the tracker was not operational.

It was found that the problem was the result of bugs in the Y2K compliant version (2.44) 
of the firmware.  On 10/14, Jeff Zirzow installed a new tracker with the Y2K non-compliant 
version (2.43) of the firmware.  It was correctly assumed that the Y2K issues would only 
be apparent at the 19991231-20000101 time boundary.

Exact times of changes are not known; noon GMT (midnight Local) was used to adequately 
window the time period of the changes.
Suggestions: 
Measurements:twpskyrad60sC2.a1:
  • pirs_sd
  • psps_sd
  • psps_mean
  • nip_mean
  • pirs_min
  • nip_sd
  • nip_max
  • psps_min
  • pirs_max
  • pirs_mean
  • nip_min
  • psps_max
more
twpskyrad60sC2.b1:
  • down_short_diffuse_hemisp_min
  • down_long_hemisp2_std
  • down_short_diffuse_hemisp
  • down_long_hemisp2_max
  • short_direct_normal_std
  • short_direct_normal_max
  • short_direct_normal_min
  • short_direct_normal
  • down_short_diffuse_hemisp_max
  • down_short_diffuse_hemisp_std
  • down_long_hemisp2
  • down_long_hemisp2_min
more

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