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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.
Fig 6-1: Parallel operation with Remote sensing
Fig 6-2: Output voltage trimming at parallel operation
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.
LOAD
FPS1000 #1
SIG.
RTN
ON/
OFF
+V
+S
-S
-V
CS
+S
-S
FPS1000 #2
SIG.
RTN
ON/
OFF
+V
+S
-S
-V
CS
+S
-S
+S
-S
FPS1000 #N
SIG.
RTN
ON/
OFF
+V
+S
-S
-V
CS
+S
-S
+V
-V
71015
71015
71015
FPS1000 #1
SIG.
RTN
ON/
OFF
V TRIM
+S
-S
CS
SIG.
RTN
ON/
OFFCS
FPS1000 #N
SIG.
RTN
ON/
OFFCS
FPS1000 #2
V TRIM
+S
-S
V TRIM
+S
-S
V TRIM
+S
-S
R1
R2
710
710
710
15
15
15
FPS1000-24:
R2=0.0785*V
2
out -5.819*Vout+105.132
R1(K
Ω)=20(KΩ)-R2(KΩ)
FPS1000-48:
R2=0.0497*V
2
out-7.2795*Vout+259.04
R1(K
Ω)=50(KΩ)-R2(KΩ)
FPS1000-32:
R2=0.0463*V
2
out -4.5805*Vout+109.49
R1(K
Ω)=20(KΩ)-R2(KΩΩ)
FPS1000-12:
R2=0.0324*V
2
out -1.1298*Vout+9.9342
R1(K
Ω)=5(KΩ)-R2(KΩ)
+V
-V