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CHAPTER 6 PARALLEL AND SERIES OPERATION
6.1 Parallel operation
Up to 8 FPS1000 units of the same output voltage rating can be connected in parallel. By connecting the CS signal
between the paralleled units, automatic current balance is achieved, with +/-10% accuracy. Derate the total output
current by 10% when using parallel operation to prevent overload condition.
The built-in Oring diodes on the main output and the 12V Auxiliary output allow N+1 operation.
For input voltages less than 100Vac, maximum output Power derated by 10% of the Power rating.
6.1.1 Parallel operation with Remote sensing
Fig 6-1 shows typical connection of parallel operation with Remote sensing. The CS signal wires should be as short
as possible and with the same length.
FPS1000 #1
+V
+S
+S
CS
15
SIG.
RTN
10
ON/
OFF
7
-S
-V
-S
+S
FPS1000 #2
SIG.
CS RTN
ON/
OFF
+V
+S
-S
-V
+S
-S
+V
-V
LOAD
15
10
7
-S
FPS1000 #N
+V
+S
+S
CS
15
SIG.
RTN
10
ON/
OFF
7
-S
-V
-S
Fig 6-1: Parallel operation with Remote sensing
6.1.2 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 as shown
in Fig 6-2.
V TRIM
FPS1000 #1
+S
R2=0.0324*V out -1.1298*V out +9.9342
CS
15
SIG.
RTN
10
ON/
OFF
7
-S
V TRIM
FPS1000-12:
2
R1(K Ω )=5(K Ω )-R2(K Ω )
-S
R2=0.0785*V out -5.819*V out +105.132
R2=0.0463*V out -4.5805*V out +109.49
FPS1000 #2
SIG.
CS RTN
15 10
V TRIM
+S
ON/
OFF
7
+V
-V
+S
-S
R 1
R 2
FPS1000-24:
2
R1(K Ω )=20(K Ω )-R2(K Ω )
FPS1000-32:
2
FPS1000 #N
V TRIM
R1(K Ω )=20(K Ω )-R2(K ΩΩ )
R2=0.0497*V out -7.2795*V out +259.04
CS
15
SIG.
RTN
10
ON/
OFF
7
+S
-S
FPS1000-48:
2
R1(K Ω )=50(K Ω )-R2(K Ω )
Fig 6-2: Output voltage trimming at parallel operation
16
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