American Power Conversion DC Series user manual Customer Inputs, Current Limit Programming

2.5 Customer Inputs

2.5.1Current Limit Programming

Input	Description	Controller	Connector
		Type
Current Limit	Connect a DC voltage to this pin (referenced to	Rear Access	SK17-2
Program	signal common or –Ve output) to reduce the system	Front Access	SK4-20
	output current limit point.
	Current limit is programmed down 1A per 1.5V
	program voltage. Max program voltage 7.5V.
5V aux	5V aux can be used to program down current limit	Rear Access	SK17-5
	level by linking to program pin.	Front Access	SK4-15

The system output current limit can also be set to either the standard “High” (100%) level or “Low” (70%) level by using SK13.

For “High” current limit level link pins 1 and 2 (default setting)

For “Low” current limit level link pins 2 and 3

Selecting “Low” current limit level will program down each rectifiers current limit level to roughly 70% of the default level. (See section 2.1.1 for default levels). This is the same as connecting the 5V aux pin to the current limit program pin as detailed above.

Note/ using both programming methods together will not double the effect

SK13

2.5.2Output Voltage Programming

Input	Description	Controller	Connector
		type
Voltage	Connect a DC voltage to this pin (referenced to	Rear Access	SK17-7
Programming	signal common or –Ve output) to adjust the system	Front Access	SK4-18
	output voltage.
	This pin floats at 2.5V nominal with respect to
	negative output (O/P @ 54.5V)
	Applying a DC voltage adjusts the output by –1V/V.
	(For 1V swing on program pin the output voltage
	changes by –1V)
	The programming voltage range is 0V – 14V, giving a
	max adjustment range of 57V to 43V.
	Note: See section 2.4 for SK4, SK17 location photo
User Manual 990-9178A			18th FEB 02
DC MX06 40A Shelf	Page 16 of 44