SGP/SIRS/E1 - Tracker failure

The tracker bypassed its limit switches and wound up the tracker instrument cables until 
it stalled and remained frozen.  It was unwound and reset during the site visit on 4/30.

Tracker instruments NIP and 8-48 (short_direct_normal, down_short_diffuse_hemisp) data are 
not recoverable.

• short_direct_normal_min
• down_short_diffuse_hemisp
• down_short_diffuse_hemisp_max
• down_short_diffuse_hemisp_std
• short_direct_normal
• down_short_diffuse_hemisp_min
• short_direct_normal_max
• short_direct_normal_std

• inst_diffuse
• inst_direct_normal