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13.1.4 Remote On/Off control at parallel operation
The paralleled racks can be turned On or Off via a single On/Off control. Refer to Fig 13-5 for typical application.
The Signal Return function of all the paralleled racks should be connected together to create a common Signal
Return bus. The Signal Return bus may be connected to the -V or the +V potential or floated. In any case do not
connect the Signal Return bus to different potentials.
FPS-S1U #1
ON/OFF
A, B, C
5, 15, 25
2.6 mA / Installed unit
SIG.
RETURN
11
2.6 mA / Installed unit
FPS-S1U #2
ON/OFF
A, B, C
5, 15, 25
SIG.
RETURN
ON/OFF
11
5, 15, 25
ON
OFF
FPS-S1U #3
A, B, C
SIG.
11
2.6 mA / Installed unit
RETURN
Fig 13-5: Remote On/Off control at parallel operation
13.2 Series operation
Two FPS-S1U racks with the same output voltage rating can be connected in series to increase the output voltage
or to create a bipolar voltage source. It is recommended to connect diodes in parallel with each output to prevent
reverse voltage in case of failure in one of the power supplies.
Each diode should be rated to at least the power supply rated output voltage and output current.
Refer to Fig 13-6 and 13-7 for a typical series connection of power supplies.
CAUTION
Series operation is not applicable for units with I 2 C bus option.
FPS-S1U #1
ON/ ON/ ON/
SIG. OFF OFF OFF
RTN A B C
11
5 15 25
FPS-S1U #2
ON/ ON/ ON/
SIG. OFF OFF OFF
RTN A B C
+S
+V
-V
-S
+S
+V
-V
-S
(*)
(*)
+S
-S
+V
-V
LOAD
11
5 15 25
(*) Diodes are user supplied
Fig 13-6: Series connection for increased output voltage
FPS-S1U #1
ON/ ON/ ON/
SIG. OFF OFF OFF
RTN A B C
+S
+V
-V
-S
(*)
+V
LOAD
11
5 15 25
COMMON
FPS-S1U #2
ON/ ON/ ON/
SIG. OFF OFF OFF
RTN A B C
11
5 15 25
+S
+V
-V
-S
(*)
-V
(*) Diodes are user supplied
Fig 13-7: Series connection for Bipolar output voltage
36
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