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FPS-S1U Instruction Manual
13.1.2 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.
A, B, C
A, B, C
-S
R2=0.0324*V out -1.1298*V out +9.9342
R2=0.0785*V out -5.819*V out +105.132
R2=0.0463*V out -4.5805*V out +109.49
FPS-S1U # 1
SIG.
CS RTN
9 11
FPS-S1U # 2
SIG.
CS RTN
9 11
7
V_TRIM 1
10
ON/ ON/ ON/ +S
OFF OFF OFF
A B C -S
5 15 25
7
V_TRIM 1
10
ON/ ON/ ON/ +S
OFF OFF OFF
A B C -S
5 15 25
V_TRIM
V_TRIM
V_TRIM
+V
-V
V_TRIM
V_TRIM
+S
R 1
R 2
FPS-S1U with FPS1000-12 installed:
2
R1(K Ω )=5(K Ω )-R2(K Ω )
FPS-S1U with FPS1000-24 installed:
2
R1(K Ω )=20(K Ω )-R2(K Ω )
FPS-S1U with FPS1000-32 installed:
2
R1(K Ω )=20(K Ω )-R2(K ΩΩ )
A, B, C
R2=0.0497*V out -7.2795*V out +259.04
FPS-S1U # 3
SIG.
CS RTN
ON/
OFF
A
7
V_TRIM 1
10
ON/ ON/ +S
OFF OFF
B C -S
FPS-S1U with FPS1000-48 installed:
2
R1(K Ω )=50(K Ω )-R2(K Ω )
9
11
5 15 25
Fig 13-3: Output voltage trimming at parallel operation
13.1.3 Signal Return bus at parallel operation
The Signal Return of each paralleled FPS-S1U rack can be connected together to form a common Signal Return
bus. By this way, the control and monitoring signals of the paralleled racks can be connected to the same control
and monitoring circuitry. The Signal Return bus can be connected to the -V or -S or +V or -S or float. Fig 13-4 shows
typical connection of the Signal Return at parallel operation.
FPS-S1U #1 AC_FAIL
DC_OK
OVER-TEMP
ALARM
SIG.
RETURN
FPS-S1U #2 AC_FAIL
DC_OK
OVER-TEMP
ALARM
11
CONTROL AND
MONITORING CIRCUITS
SIG.
11
FPS-S1U #1 SIGNALS
RETURN
FPS-S1U #2 SIGNALS
FPS-S1U #3 AC_FAIL
DC_OK
OVER-TEMP
ALARM
FPS-S1U #3 SIGNALS
SIG.
RETURN
11
SIGNALS RETURN
Fig 13-4: Signal Return connection at parallel operation
35
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