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Fig 12-1: single load connection, local sensing
Fig 12-2: Remote sensing, single load.
Fig 12-3: Multiple loads connection with distribution terminal
CHAPTER 12 BASIC CONNECTIONS FOR OPERATION FPS-S1U RACK
12.1 Connecting single load, Local sensing
Local sensing is suitable for applications where load regulation is not critical. Fig 12-1 shows recommended
load and sensing connections for applications with a single load.
12.2 Connecting Single Load, Remote Sensing
Remote sensing is used in cases where the load regulation is important at the load terminals. Use twisted
or shielded wires to minimize noise pick-up. If shielded wires are used, the shield should be connected
to the ground at one point, either the power supply side or the load. The optimal point for the shield ground
should be determined by experimentation. Refer to the power supply specifications for the maximum
voltage drop allowed at the load wires.
12.3 Multiple loads connection
If remotely located output distribution terminals are used, the power supply output terminals should be
connected to the distribution terminals by a pair of twisted or shielded wires. Each load should be separately
connected to the remote distribution terminals (see Fig 12-3). If remote sensing is required, the sensing
wires should be connected to the distribution terminals or at the most critical load.
LOAD
FPS-S1U
SIGNAL
RTN
ON/
OFF
C
+V
+S
-S
-V
13
22
+V
-V
ON/
OFF
B
ON/
OFF
A
2515511
LOAD
FPS-S1U
SIGNAL
RET
+V
+S
-S
-V
13
22
511
Sense lines
Twisted pairs
Load line. Up to 1V drop.
Load line.
Up to 1V drop.
ON/
OFF
A
ON/
OFF
B
ON/
OFF
C
15 25
+V
-V
*
FPS-S1U
+V
+S
-S
-V
13
22
LOAD # 1
+
-
LOAD # 2
+
-
LOAD # 3
+
-
+V
-V
SIGNAL
RET
511
ON/
OFF
A
ON/
OFF
B
ON/
OFF
C
15 25
In Local sense applications, the +/- sense have to be connected to the
+/-V terminals of the FPS-S1U prior to operating the FPS1000 units plugged in.
*