Service manual

Always On UPS Systems Inc
69
Table 28.1 Operation for the 3S PCB
NORMAL ABNORMAL
PCB FUNCTION LOCATION
PCB LED
LED
Illumination
Description
LED
Illumination
Description
SOLUTION
If DC bus can not be
stabilized, the AC output is
transferred to the reserve
automatically
Ensure cable connections are secure
and correctly attached. The expected
MTBF for this system is 3,000,000
minutes.
3S Rectifier Drive
Rectifier
Module
If during operation, it transfers
to back-up mode.
Check input and rectifier breaker are
closed and input utility is present
Figure 28.3
Layout of Rectifier Module (6-pulse)