Mitsubishi Electric 9900D Series Owner Technical Manual page 67

Table 7.2 UPS Module Fault Code List
Code
indication
message
(Note 2)
MF332 CTRL.CIRCUIT ERR.
MF333 CTRL.CIRCUIT ERR.
MF334 CTRL.CIRCUIT ERR.
MF376 CTRL.CIRCUIT ERR.
MF552 DUMMY FAULT
(Note 1) 1) "Major" is defined as a major failure. Load transferred from the inverter circuit to the
static bypass line;
2) "Minor" is defined as a minor failure. UPS continues to operate normally, but the
cause of alarm must be identified;
(Note 2) Code indication means:
#A+++ --------------------- Alarm
#F+++ --------------------- Failure
#%0++ -------------------- Rectifier circuit failure
#%1++ -------------------- DC circuit failure
#%2++ -------------------- Inverter circuit failure
#%3++ -------------------- Control circuit failure
#%4++ -------------------- Bypass system failure
#%8++ -------------------- Alarm
"#" Bypass Module "U", UPS Module "M"
"+" denotes any numeral from 0 to 9
"%" denotes either "A" or "F"
9900D SERIES UPS
OWNERS / TECHNICAL MANUAL
Status
Cable disconnection in the main driver PCB (Phase V)
Cable disconnection in the main driver PCB (Phase W)
Cable disconnection in the main driver PCB (Chopper)
No control response from another UPS although its
detection is possible.
Dummy fault for test
MITSUBISHI ELECTRIC 9900D SERIES UPS
Meaning
Page Number:
7-10
External relay
contact
(Note 1)
Major
Major
Major
Minor
Major