TOA Electronics FPS1000-32, FPS1000-24, FPS1000-12 Output voltage trimming at parallel operation

FPS-S1U Instruction Manual

13.1.2 Output voltage trimming at parallel operation

The output voltage of the units connected in parallel can be made by a single trimmer or resistive divider.

				V_TRIM		7
						1
FPS-S1U # 1				A, B, C		10
				ON/ ON/ +S
			ON/				V_TRIM
	SIG.		OFF	OFF OFF
CS			A	B	C -S				V_TRIM
	RTN
9		5	15		25
	11								V_TRIM
				V_TRIM		7	V_TRIM	+V	+S
						1
FPS-S1U # 2				A, B, C		10				R1
				ON/ ON/ +S
			ON/
	SIG.		OFF	OFF OFF						R2
CS			A	B	C -S				-S
	RTN							-V
9	11	5	15		25
							V_TRIM

V_TRIM	7
	1
A, B, C	10

FPS-S1U # 3

			ON/	ON/ ON/+S
	SIG.		OFF	OFF OFF
CS		A		B	C -S
	RTN
9	11	5	15		25

Fig 13-3: Output voltage trimming at parallel operation

FPS-S1U with FPS1000-12 installed: R2=0.0324*V2out -1.1298*Vout+9.9342 R1(KΩ)=5(KΩ)-R2(KΩ)

FPS-S1U with FPS1000-24 installed: R2=0.0785*V2out -5.819*Vout+105.132 R1(KΩ)=20(KΩ)-R2(KΩ)

FPS-S1U with FPS1000-32 installed: R2=0.0463*V2out -4.5805*Vout+109.49 R1(KΩ)=20(KΩ)-R2(KΩΩ)

FPS-S1U with FPS1000-48 installed: R2=0.0497*V2out-7.2795*Vout+259.04 R1(KΩ)=50(KΩ)-R2(KΩ)

13.1.3 Signal Return bus at parallel operation

The Signal Return of each paralleled FPS-S1U rack can be connected together to form a common Signal Return bus. By this way, the control and monitoring signals of the paralleled racks can be connected to the same control and monitoring circuitry. The Signal Return bus can be connected to the -V or -S or +V or -S or float. Fig 13-4 shows typical connection of the Signal Return at parallel operation.

FPS-S1U #1 AC_FAIL

DC_OK

OVER-TEMP

ALARM

SIG.	11
RETURN

FPS-S1U #2 AC_FAIL

DC_OK

OVER-TEMP ALARM

SIG.	11
RETURN

FPS-S1U #3 AC_FAIL

DC_OK

OVER-TEMP

ALARM

SIG.	11
RETURN

CONTROL AND MONITORING CIRCUITS

FPS-S1U #1 SIGNALS

FPS-S1U #2 SIGNALS

FPS-S1U #3 SIGNALS

SIGNALS RETURN

Fig 13-4: Signal Return connection at parallel operation

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