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                                    Designed for either bench or rack use, the typical DCR-B
power supply provides a highly regulated, precise d-c
output, adjustable over a wide range. It operates from
a nominal 115 Vac (208/220/230-Vac inputs are available
as options) and exhibits a rapid response to transients,
both load and line.

	
1. INTRODUCTION AND DESCRIPTION		
		
1.1	Introduction..............	...1-1
1.2	Description...............	...1-1
1.3	Optional Modifications....	...1-3
1.4	Accessory OVP.............	...1-3
		
2. PREPARATION FOR USE		
		
2.1	General...................	...2-1
2.2	Initial Inspection........	...2-1
2.3	Electrical Installation...	...2-1
2.4	Mechanical Installation...	...2-2
2.5	Electrical Check..........	...2-2
		
3. OPERATING INSTRUCTIONS		
3.1	General...................	...3-1
3.2	Voltage-Mode Operation....	...3-1
3.3	Current-Mode Operation....	...3-5
3.4	Parallel Operation........	...3-7
3.5	Series Operation..........	. ..3-9
3.6	Unit-Shutdown Circuit.....	3-14
4.1	Introduction..............	...4-1
4.2	Phase-Control Principle...	...4-1
4.3	Block-Diagram Analysis----	...4-3
4.4	Detailed Circuit Description.4-3	
		
MAINTENANCE		
		
5.1		...5-1
5.2	Periodic Servicing........	...5-1
5.3	Troubleshooting...........	...5-1
5.4	Calibration...............	...5-1
5.5	Performance Testing.......	...5-3
		
DRAWINGS AND PARTS LISTS		
		
6.1		...6-1
6.2	Parts List Column	
	Headings Defined..........	6-1
OVERVOLTAGE (OVP) ACCESSORY (MS		OPTION)
		
7.1		. ..7-1
7.2	Installation..............	...7-1
7.3	OVP Adjustment............	...7-2

This manual contain; operation and maintenance data on the 500-watt units of the DCR-B series Sorensen Power Supplies. It is intended to familiarize the user with the functioning of the unit, to introduce the varied applications to which the unit may be adapted, and to furnish sufficient maintenance data to assure long operating life.

Seven major sections form the manual divisions. Section
1 contains a brief functional description of the DCR-B
series power supplies. Initial inspection and checkout
procedures are outlined in section 2. Operating instructions,
including methods for adapting units to various applications,
comprise section 3. Sections 4 and 5 provide the principles
of operation and maintenance procedures respectively.
System drawings and the replacement parts list are provided
in section 6. Concluding the manual, section 7 describes
the DCR-B OVP (overvoltage protector) accessory M5.