The burst time of the damage beam/salvage beam/... all seem to suffer from the same issue.
When logic activates the computer it always fires a 2.5-3 second long burst, no matter what burst time that computer should have.
I tested this out on damage beam (1 second burst time), damage beam + pulse (6 seconds), salvage beam + pulse (15 seconds). All of them were 2.5 seconds long when used with logic, their cooldown was fine.
Seems that it is hardcoded somewhere.