TOA Electronics FPS1000-12, FPS1000-24, FPS-S1U Parallel And Series Operation, Parallel operation

CHAPTER 13 PARALLEL AND SERIES OPERATION

13.1 Parallel operation

Up to 3 FPS-S1U racks with up to 8 FPS1000 installed units of the same output voltage rating can be connected in parallel. The built-in Oring diodes on the main output and on the +12V auxiliary voltage in each FPS1000 unit allow N+1 operation. By connecting the CS signal between the paralleled units, automatic current balance is achieved, with +/-10% accuracy. For input voltages less than 100Vac, maximum output Power derated by 10% of the Power rating. Refer to Fig 13-1 for output Power derating in parallel operation.

%of rated Power

100

90

			Input voltage
		265
85	100		(Vrms)

Fig 13-1: Output Power derating at parallel operation

13.1.1 Parallel operation with Remote sensing

Fig13-2 shows typical connection of parallel operation with Remote sensing. The CS signal wires should be as short aspossible and with the same length.

FPS-S1U #1				+V			+S
				+S
		ON/ ON/		ON/	-S		-S
	SIG. OFF OFF OFF				-V
CS RTN		A	B	C
9	11	5	15	25			+S
FPS-S1U #2				+V		+S	+V
				+S
							LOAD
		ON/ ON/ ON/			-S
						-S
	SIG. OFF OFF OFF				-V		-V
CS RTN		A	B	C
9	11	5	15	25
							-S
FPS-S1U #3				+V		+S
				+S
		ON/ ON/		ON/	-S	-S
	SIG. OFF OFF OFF				-V
CS RTN		A	B	C

9 11

5 15 25

Fig 13-2: Parallel operation with Remote sensing

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