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5. PARALLEL OPERATION
5.1. Remote sensing and current balance
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.
FPS-S1U #1
ON/
SIG.
OFF
CS
RTN
A
9
11
5 15 25
FPS-S1U #2
ON/
SIG.
OFF
CS
RTN
A
9
11
5 15 25
FPS-S1U #3
ON/
SIG.
OFF
CS
RTN
A
9
11
5 15 25
6. SERIES OPERATION
Up to 2 units of the same voltage and current rating can be used for increased output voltage
It is recommended that diodes be connected in parallel with each unit output to prevent revese
voltage. Each diode should be rated to at least the power supply rated output voltage and
output current.
Series operation is not applicable for units with I
FPS-S1U #1
ON/
ON/
ON/
SIG.
OFF
OFF
OFF
RTN
A
B
11
5 15 25
FPS-S1U #2
ON/
ON/
ON/
SIG.
OFF
OFF
OFF
RTN
A
B
11
5 15 25
+V
+S
ON/
ON/
-S
OFF
OFF
-V
B
C
+V
+S
+S
ON/
ON/
-S
OFF
OFF
-S
-V
B
C
+V
+S
+S
ON/
ON/
-S
OFF
OFF
-S
-V
B
C
CAUTION
+S
+V
(*)
-V
-S
C
+S
+V
(*)
-V
-S
C
(*) Diodes are user supplied
+S
-S
+S
+V
LOAD
-V
-S
Fig 5-1
C bus option.
2
+S
+V
LOAD
-V
-S
Fig 6-1
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