American Power Conversion DC Series user manual Major and Minor Alarms

2.4.4Major 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	Minor alarm
		selection	selection
Over Temperature	1 or more rectifiers tripped due to excessive	SW2-1	SW5-1
	internal temperatures
	(Resets itself when cooled down)
Over Volts	1 or more rectifiers tripped due to excessive	SW2-2	SW5-2
	o/p voltage (interrupt AC input or remove
	rectifier and refit to reset)
Over Current	1 or more rectifiers in current limit state	SW2-3	SW5-3
Fan Fail	One or more of the Rectifier fans have	SW2-4	SW5-4
	stopped
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.

User Manual 990-9178A	Page 15 of 44	18th FEB 02
DC MX06 40A Shelf