[evlatests] Generator Utility Module

[Sylas Ashton]

Previous tests using the remote start feature of the Generator Utility 
Module caused the module to stop communicating, once at 20 minutes after 
the generators started and once 90 minutes after the generators started.

The suspected cause of the problem is extra noise coupled onto the 24V 
power to the generator by the remote start line. Several weeks ago, we 
added a 100ohm series resister into the line inside the module. Since 
the site load was too high that day, we were unable run tests that day.

On Wednesday, connected a debugger to the MIB and ran the tests.

During the first test, the module was reset when one of the relays 
engaged during the generator startup sequence. Fearing a new failure 
mode, we went through the remote startup sequence a total of 5 more 
times, and could not replicate the new error. After one of the remote 
starts, we left the generators running for 90 minutes. Module did not 
lose communications the rest of the day.


The original problem appears to be solved. The one glitch we did see may 
have been caused by EMI pick up by the debugger cable connected to the 
MIB while a large relay switched.