Service manual

Always On UPS Systems
M0704_NX_Series_Service_Manual V2.17 2012-06-12 62
Table 22.1 LED Operation for the 3T PCB
PCB FUNCTION LOCATION
NORMAL ABNORMAL
SOLUTION
PCB LED
LED
Illumination
Description
LED
Illumination
Description
3T Inverter Phase Control PCB Module
LED T1,
T2
All Yes PCB has power All No
R, S or T phase lost,
output LED on the
front panel (mimic
diagram) blinks
indicating lost phase.
Ensure cable connections are secure
and correctly attached.
Replace the board
LED T1
LED T2
Picture 22.1
3T PCB (Inverter Driver)