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BE SURE TO use fuse with same spec as original ones to replace failure ones, otherwise,

unpredictable danger could happen.

If all components listed above are in normal condition and UPS still can’t be DC started, try

to change DCDC module.

6.3.5 DC/AC Inverter Analysis

Item Checked components Instrument function Reference Value Failed Condition

1 F3, F2, F1

Short Open

2 2k/3k:Q14, Q13, Q16, Q15 (EC)

1k:Q14, Q13, Q16, Q15 (EC)

Diode Voltage Droop 0.4 Short or open

3 2k/3k:Q14, Q13, Q16, Q15 (CE)

1k:Q14, Q13, Q16, Q15 (CE)

Diode Voltage Droop Infinite Short

4 2k/3k: R110, R106, R117, R119

2k/3kR53,R37

2K/3K: 47K

1K: 20K

Open

5 2k/3k:R107, R109, R116, R120

R114, R103, R111, R122

1k: R40, R54

10.0

36.0

Open

If fail condition stated in item 3 occurs, it is very possible that the corresponding IGBT driver

module is damaged, so please try to change the IGBT driver module.

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Component Solution Services REC02F Manuale di Servizio Pagina 35