Mitsubishi Electric 9900D Series, Owner Technical Manual

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MITSUBISHI ELECTRIC 9900D SERIES UPS
9900D SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
7-10
Table 7.2 UPS Module Fault Code List
Code
indication
(Note 2)
Status
message
Meaning
External relay
contact
(Note 1)
MF332 CTRL.CIRCUIT ERR. Cable disconnection in the main driver PCB (Phase V) Major
MF333 CTRL.CIRCUIT ERR. Cable disconnection in the main driver PCB (Phase W) Major
MF334 CTRL.CIRCUIT ERR. Cable disconnection in the main driver PCB (Chopper) Major
MF376 CTRL.CIRCUIT ERR.
No control response from another UPS although its
detection is possible.
Minor
MF552 DUMMY FAULT Dummy fault for test Major
(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”