American Power Conversion DC Series user manual Available Alarms, Access

2.4 Alarms

2.4.1Available Alarms

To monitor the system status a selection of alarm outputs are available. Dependant upon the rectifiers fitted either 4 front panel LED’s or a single LED give visual notification of a system fault. There is also a range of open collector transistor alarm outputs, which can be accessed at the rear of the shelf or on a front panel connector (selected models). Finally there are 2 sets of relay contacts that can be configured to represent 1 or more alarms selected by the user.

Below is a list of the available alarms along with their function and pin number.

Note/ Alarms marked with a * are not available if system is fitted with single LED rectifiers.

Alarm / User		Description	Rear	Front
Outputs			Access	Access
Bus Voltage Low		System volts dropped to LVD set level +10%, LVD imminent	SK14-2	SK4-25
* Fan Fail		One or more of the Rectifier fans have stopped	SK14-3	SK4-24
2+ Rectifiers Fail		2 or more rectifiers giving output less than 31Vdc	SK14-4	SK4-5
Rectifier Fail		1 Rectifier giving output less than 31Vdc	SK14-5	SK4-6
Distribution Trip		1 or more fuse blown or breaker tripped	SK14-6	SK4-2
AC Fail		1 or more of the AC input feeds failed	SK14-7	SK4-1
* Over Current		1 or more rectifiers in current limit state	SK14-8	SK4-23
* Over Voltage		1 or more rectifiers tripped due to excessive o/p voltage	SK14-9	SK4-22
		(interrupt AC input or remove rectifier and refit to reset)
* Over Temperature		1 or more rectifiers tripped due to excessive internal	SK14-10	SK4-21
		temperatures (resets itself when cooled down)
Signal Common		Use to reference all alarms to	SK17-1	SK4-17
Current Share		Use for paralleling purposes only	SK17-3	SK4-16
Current Analogue		Analogue voltage representing load current (1V = 5A ± 5%)	SK17-4	SK4-19
5V Auxiliary		Low current capability 5V supply for use with current limit	SK17-5	SK4-15
		programming.
Major Failure		‘Minor’ relay contact (closed for alarm)	SK18-1	SK4-11
“	“	‘Minor’ relay contact (Common)	SK18-2	SK4-10
“	“	‘Minor’ relay contact (open for alarm)	SK18-3	SK4-12
Minor Failure		‘Major’ relay contact (closed for alarm)	SK18-4	SK4-8
“	“	‘Major’ relay contact (Common)	SK18-5	SK4-7
“	“	‘Major’ relay contact (open for alarm)	SK18-6	SK4-9

Warning! All alarm outputs other than the relay contacts are open collector transistors. Each output has a max voltage rating of 60Vdc and a current sink capability of 20mA

User Manual 990-9178A	Page 13 of 44	18th FEB 02
DC MX06 40A Shelf