Chapter 6 - Troubleshooting 7400 Series UPS User Manual
Troubleshooting UPS System Single Module and One plus One Systems
6310018a.02.doc
6-4
Issue 2
(02/98)
LS6** ON If LS4 is also OFF then refer to LS4 checks.
If LS6 is OFF but LS4 is ON then check the following:
a) Ensure that the output circuit breaker is closed then press the Reset
button (PS1) on the UPS Logic Board.
b) Ensure that slide switch I1 on the Static Switch Logic Board is in the
AUTO position.
If the above checks prove unsatisfactory then seek qualified assistance.
**Note that in a one-plus-one system configured with a redundant
module, it is possible for one of the two modules to shut down (due to a
fault for example) without turning on its static switch. In a redundant
module configuration, a module's static switch is disabled whenever its
partnering module is on line. Therefore in the event of a fault you are
likely to see LS4,5,6 all OFF.
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