TWP/SKYRAD/C2 - Solar tracker failure

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.

• pirs_sd
• psps_sd
• psps_mean
• nip_mean
• pirs_min
• nip_sd
• nip_max
• psps_min
• pirs_max
• pirs_mean
• nip_min
• psps_max

• 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