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User Manual 990-9178A
DC MX06 40A Shelf Page 15 of 44 18
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FEB 02
2.4.4 Major and Minor Alarms
In an MX06 40A Shelf, 9 of the available alarms can be set to show as a “Minor” or “Major” alarm. As
standard the alarm outputs are open collector transistor outputs available from the connectors as detailed
in the 2 previous sections. If an alarm is selected as a Minor or Major alarm it also lights the corresponding
“Major” or “Minor” front panel LED and the “Major” or “Minor” relay contacts also change over. More than
one alarm can be selected at once and each alarm can be selected as both Major and Minor if required.
The relay contacts are rated as follows:
AC Rating - 0.5A @ 125Vac
DC Rating - 1A @ 24Vdc
Max VDC - 0.6A @ 110Vdc
Alarm Description Major alarm
selection
Minor alarm
selection
Over Temperature 1 or more rectifiers tripped due to excessive
internal temperatures
(Resets itself when cooled down)
SW2-1 SW5-1
Over Volts 1 or more rectifiers tripped due to excessive
o/p voltage (interrupt AC input or remove
rectifier and refit to reset)
SW2-2 SW5-2
Over Current 1 or more rectifiers in current limit state SW2-3 SW5-3
Fan Fail One or more of the Rectifier fans have
stopped
SW2-4 SW5-4
Bus Voltage Low System volts below 48V LVD imminent SW2-5 SW5-5
A.C Fail 1 or more of the AC input feeds failed SW2-6 SW5-6
Fuse Fail 1 or more fuse blown or breaker tripped SW2-7 SW5-7
2 or more Rectifier Fail 2 or more rectifiers giving output < 31Vdc SW2-10 SW5-10
Rectifier Fail 1 Rectifier giving output less than 31V dc SW2-11 SW5-11
See sections 2.3 for info on SW2 and SW5 location and relay contact pin-outs.