DEC 4000 AXP Service Manual page 208

Table B–1 (Cont.) Power System Controller Fault ID Display
Fault ID Display (Hex)
FEU Module Faults
E200
E201
E202
E204
E205
E206
E210
E211
E220
Fan, LDC, and Temperature Faults
1 + Fan Failure LED on
2 + Fan Failure LED on
3 + Fan Failure LED on
4 + Fan Failure LED on
9 + Fan Failure LED On
A + Disk Power Failure LED on
B + Disk Power Failure LED on
C + Disk Power Failure LED on
D + Disk Power Failure LED on
7 + PSC Failure LED on
8 + PSC Failure LED on
0 + Overtemperature shutdown
LED on
B–6 Power System Controller Fault Displays
Meaning
SWITCHED 48 okay before enabling
Fan converter operating before enabling
HVDC is okay, but POWER is not okay
(contradictory status)
DIRECT 48 not okay and POWER is okay
(IRQ18)
SWITCHED 48 not okay and switched bus
requested (IRQ19)
HVDC is okay, but POWER is not okay (IRQ20)
SWITCHED BUS did not turn on a startup
SWITCHED BUS did not turn off at power down
Fan converter voltage is low
Fan 1 failed
Fan 2 failed
Fan 3 failed
Fan 4 failed
Cable guide is not secured or 2 fans failed
LDC A failed
LDC B failed
LDC C failed
LDC D failed
Temperature sensor bad—low reading
Temperature sensor bad—high reading
System temperature in red zone
FRU
FEU
FEU
FEU
FEU
FEU
FEU
FEU
FEU
FEU
Fan 1
Fan 2
Fan 3
Fan 4
LDC A
LDC B
LDC C
LDC D
PSC
PSC